Free Shipping over $199* Same Day Shipping before 7pm* . Benefits of Negative Crankcase Pressure using an Electric Pump: 1) Prevents oil leaks from seals and gaskets by eliminating crankcase pressure. Either way, it avoids sucking crankcase vapors into the intake tract as an OEM system does. ADJUSTABLE VACUUM REGULATOR SCREWS DIRECTLY INTO THE PUMP. Be very skeptical on power gains claimed by the vendor. It is very important to carefully check drive-belt alignment and adjust when necessary to achieve perfect alignment between the pulleys. The availability of 3D Model downloads of our vacuum pumps . As with all GZ Vacuum Pumps, Rulon Wipers are still used exclusively as it's the best material to use for tough hot and oily applications that we've found. The key to getting the most out of an external vacuum pump lays in choosing the setup that best suits your engine. Main Caps, Main Girdles and Valley Girdles, Pulleys, Front Drive System & Accessory Drive Kits, Air Fuel Ratio, Exhaust Gas Temp. GZMS pumps are manufactured in our shop. The speed would be regulated via the pump's driven pulley. Whether you have a normally-aspirated small block or nitrous-equipped pro-mod, Moroso offers "purpose-built" racing vacuum pumps with all of the advantages you need to reduce frictional horsepower losses, blow-by, intake charge contamination and aid in detonation prevention. 69 SS396 fathom green N/A525 833chrysler 4spd 3550# stock suspension 10.11/137mph. As a matter of fact they are NOT plugged! advantageous to achieve maximum vacuum early in the power band, so if you wish As a rule, its better running a larger pump at slower speed to achieve the level of vacuum required while preserving pump longevity. A "small" vacuum pump would indicate a This was a lot of oil for such a short run time so we figured that we had a gasket leak. It just pulls the fumes through and replaces with fresh air. 2023 JEGS High Performance. Star Machine factually represents our pumps performance, size and weight. Quieter Operation - Want to run a vacuum pump on a street car? *Not intended for applications with mufflers Item #: MOR-25900. Price: $93.99. Moroso Original 3-Vane Vacuum Pump Kit Big Block Chevy. After pulling the engine off the dyno we noticed that there were several ounces of oil in the vacuum system puke tank. Everything is up high and out of the way so it is easy to reach, and the hoses are clear so you can see if you have any trash or buildup in there that may be clogging the system. A quick look around the engine found a loose valve cover bolt, which we think, was causing a small air leak. Our recently redesigned Pro Racing Vacuum Pump is a purpose built pump specifically designed for the hot, wet and oily environment found in race car crankcase vapors. In any other position, excess oil will build up at the bottom of the pump and may cause the vanes to stick in the rotor slots.. Same system we use in aircraft piston engines, but use 80 psi on the first gauge. GZ Motorsports pumps may pull in excess of 20 in. $40.00 - $1200.00 . If you do not want to install a vacuum However, the most common way to notice this is when the engine . Our first dyno run was a baseline test with the engine configured the same as it was in the previous dry sump test. Accessories, Pulls much more vacuum than stock smog pumps, Special vane material for improved seal and wear, Pulls 13.9% more vacuum and does so sooner, Flows up to 150% more than the original design, The rotor is keyed to the shaft, eliminating fastener failure, The pump weighs 7 lbs, 8 oz (with bracket and fittings), Billet bracket and -16AN beaded fittings included (bracket mounts to the motor plate & rotates 360). after repaired started to whistle/ buz . control valve use a smaller pump than recommended, check your vacuum and determine if you really need one. Remember that it is the pressure in the pan that forces oil into the pickup. Established in 2002, STAR Machine specializes in crankcase vacuum technology for the motorsports industry. The cylinder heads are a pair of AFR cylinder heads with 2.125/1.600 valves, 70cc chambers, and 245cc intake runners. Before any air sucked out of the engine can reach the pump, it first flows through a pressure regulator, which is a nice feature. 2nd pump is an electric pump from summit. If the pump is not sized, plumbed and geared correctly, it may not be able to move enough air to create a negative pressure in the crankcase. 900 hp, we recommend increasing the pulley ratio to 64% of crank speed and increasing the inlet line size These pumps will be able to produce enough vacuum to seal the rings and evac the CrankCase to releave the blowby build up. Generally, the vacuum pump is run at half the rpm of the engine. An all new diecasting, only available from GZ Motorsports, forms the core of the new pump with much closer tolerences than previous models enhancing it's air flow potential. An all new die casting, only available from GZ Motorsports, forms the core of the new pump with much closer tolerances than previous models, enhancing its air flow potential. For smaller engines and low power adder ouputs we recommend our vacuum pump that is to big may eliminate horse power gains altogether because of the parasitic horsepower it takes to run the pump. Vacuum pumps can be All rights reserved. Passenger side is higher pressure than driver side. It just happens to have a vacuum pump plumbed up, and he was willing to test the mouse motor on the dyno both with and without the pump to see the power difference. This is something that should be discussed with your engine builder and or tuner. hg. For a small-block, it has a pretty big displacement with a 4.165-inch bore and 4.00-inch stroke, creating 436 ci of displacement. The Star vacuum pump created 15 inches of vacuum in the crankcase and the power increased from 741 to 760 hp. Brand New. You leave out the PCV and run the electric vacuum pump via Hobbs then there is crankcase pressure present. Also, crankcase vacuum reduces the pressure on gaskets and seals and lessens the chance . The cam is a solid roller from Comp Cams, but we wont get into the specifics of the grind. Of course maximum engine RPM needs to be considered as well, as vacuum pump RPM should be considered. 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Estimated to ship direct from manufacturer on 03/20/23, pending manufacturer availability. Pump choice is primarily based on engine size and horsepower level with appropriate attention to pump speed and vacuum line size. 2) It should read the same although there is a "high pressure" and a "low pressure" side of the crankcase. Pump Sizing. anything over 12" seemed to offer relatively nominal increases in horsepower (Typically 3-10 more HP between 10" and 15"). NOTE: Some parts are not legal for use in California or other states with similar laws and/or regulations. This is a general guide based on typical engines GZMS has fitted over the years as well as customer reports, some situations may be different, if in doubt email or call our tech support line. Illustration shows a typical Pan-Evac system that uses exhaust pulses to draw vacuum from the valve covers. The engines are actually sealed tight, and the external oil pump also scavenges air along with oil to effectively pull a vacuum inside the crankcase. This is a Chrysler 400 engine block with Molnar 3.91-inch crankshaft and 6.700-inch connecting rods and JE pistons. the pump to run 6000 rpm or less for best longevity. . we found that the Wilson porting work paid off nicely with an increase of another 15 hp. It is also why many racers use vacuum pumps on the crankcase to help increase the ring seal. If there is less vacuum in the crankcase, this would be an over-pressure condition (which means air is leaking into the crankcase). Pulley ratio is typically 64% of crankshaft speed, this is generated by using a 3.5" Crankshaft Pulley and a 5.5" Pump Pulley unless noted otherwise with a maximum pump rpm of 6000. Most pump kits include mounting hardware that provides the ideal pump location and proper drive pulley alignment. 1) Yes, that will work fine. The 75% pump speed should not be used Jones gave us a simple example that if one were to build a 565ci big-block Chevy that means there is 565ci of pumping effort above and below the piston rings. Teardown note: Therefore, the oil pump sees less resistance, thus less pressure. Updates also include improved and beefed up port locations, totally rebuildable bearing sections and long life wipers. Vacuum Rating: medium vacuum service. to the pump, however it is more expensive option. This is fine for a drag racing engine that wont see many laps over a weekend, but for a street or circle track race engine thats usually a little too short of a lifespan. 2. Of course, many racers run pin oilers for the added security and also to help pull heat out of the piston crowns. STAR Machine specializes in crankcase vacuum technology for the motorsports industry. The issue I am dealing with is the reverese as it has vacuum sucking air in. you use, the sooner the vacuum will be generated, and the quicker you will Moroso vacuum pumps, as well as some from other performance manufacturers, have an advantage over OEM-style air pumps because they are designed expressly for high-rpm race engines and have a greater life expectancy. Lower oil pressure (with a vacuum pump) is common based on the fact that the oil is being drawn out from between the bearing and journal of both the crankshaft mains and the connecting rods at a higher rate (because of the vacuum), he explains. reach the limit of a vacuum control valve. A small vacuum pump that is not quite making enough vacuum can benefit by increasing the rotational speed, or RPM, of the pump. Estimated to ship direct from manufacturer on 03/21/23, pending manufacturer availability. Mark Woodruff owns and pilots one of the nicest (and fastest) Outlaw Drag Radial racecars of the current generation, sporting a ProLine Racing 5" bore space twin turbocharged, monster of an engine. Also, it is more value at the test rpm noted above. also recommend #12 inlet line to one valve cover, or #10 lines to two valve covers for maximum air flow. So the vacuum value will vary depending on the engines ability to seal, prevent blow-by, and the tune-up. You always want to use a catch can or two before the pump. GM GENUINE 12567915 Positive Crankcase Ventilation (PCV) Valve ALL THE PARTS YOUR CAR WILL EVER NEED Show Prices In US Dollars ($) Australian Dollars (AU$) Brazilian Real (R$) British Pounds () Canadian Dollars (CAD$) Chilean Pesos (CL$) Euros () Japanese Yen () Mexican Pesos (Mex$) New Zealand Dollars (NZ$) Norwegian Krone (NOK) Polish . Compare that service life with any other brand pump and you'll find nothing else comes close to lasting that long. I currently run a header evac setup which works ok at full throttle, but doesn't really do much under . Ive seen severe cases where the windage was so bad that it would blow oil out of the breathers, he said. A leak down tester probably wont tell you anything. Larger small-blocks with a power adder might need to change to pulley to run at 64% crankshaft speed. the p.c.v valve was used to . range. Ultimately, the engine will only make as much vacuum as its condition allows. A pump is a pump. desired net crankcase vacuum desired. Thats definitely nothing to sneeze at and according to a quarter-mile calculator, with a 2,500-pound car it should equate to a reduction in quarter-mile times by a little over 5/10th of a second. But this means they are usually good for 300 passes before Moroso recommends a rebuild (which the racer can do). Vacuum Pumps/Crankcase Evacuation at Competition Products! Today, manipulating the pan vacuum with a dedicated pump such as those offered by GZ Motorsports and Moroso is more effective and gives the engine builder another tuning tool. The following chart shows the net vacuum needed at 64% on the lower HP end of this range to 75% of crank speed at approximately 1500 HP and above, we Dorton ran the engine just long enough to match the water and oil temps back up to the same as the previous tests and made a pull. Naturally to limit the maximum vacuum. Reply HELP for help or STOP to opt out. at 54% of crank speed for a 750 HP Engine. Power adders such as turbochargers, superchargers or nitrous oxide increase cylinder pressure and blow by and thus require larger pumps and bigger lines to accommodate increased airflow. In some cases one stage may be connected to a valve cover or even the lifter valley area. External crankcase vacuum pumps will provide significant power gains on both racing and high-performance street engines, primarily by promoting superior ring sealing. The Summit Racing 760152 brake-booster vacuum pump is an ideal choice for cars with big cams that may run short on vacuum for their power brake boosters. By creating negative pressure inside the crankcase (compared to atmospheric pressure), the chances for ring flutter are further reduced, the pressure differential between the top of the piston and the bottom on the power stroke is increased, and even oil foaming is reduced because there is no air to create bubbles in the oil as it gets whipped up by the spinning crankshaft. the tubs on your headers works at high r.p.m,s to remove blow buy gasses they dont work on the street. With our baseline confirmed, we added the vacuum pump and re-ran the tests. Pulling vacuum with a dedicated pump has been the preferred method for well over two decades now and the technology has steadily advanced with important performance benefits that include: An external vacuum pump evacuates excessive crankcase pressure, resulting in less-than-atmospheric pressure in the sump. Black. Includes two clamp-on washable & reuseable shielded filters with breather adapters. GZMS vacuum pumps all show the test vacuum and date tested on the part sticker on the pump. into the crankcase increases enough to reduce the negative net airflow out of The other system I've seen is actually a vacuum pump, drawing a vacuum on the crankcase. Aerospace Components. He currently operates Scranton Racing Development and utilizes the in-house dyno for various engine projects and manufacturer testing. This is the test In fact recent durability testing we've conducted with our new extended life wipers proved that this pump can run 500 hours at 3500 RPM with a light oil mist and still maintain full vacuum! In general GZMS Temp (continuous): min 15F (26C) max 220F (104C) Filter change out differential: 15-20"H 2 O (3750 mbar) over initial P. Polyester: 99%+ removal efficiency standard to 5 micron. Racing Vacuum Pumps & Accessories Call (270) 856-8890 / Mon - Fri, 8 am . This move, however, is very much dependent on ring type, cylinder finish, ring land tolerances and even stroke length and engine speed, all of which affect the frequency and dynamics of piston reversal and its effect on ring performance. Controlling crankcase vacuum on this 3,500 horsepower engine is a Moroso vacuum pump and a dry sump pump. The crankcase pressure wanders between -2.5 to 4 inches of water column (-7 to 10 millibar, well below the specification for this engine of -30 millibar, plus or minus 5 millibar). Vacuum pumps require a dedicated belt that does not drive any other components. These systems are NOT for vehicles with mufflers. The nature of a vacuum pump is to remove air, blow-by gases, and other contaminants from the crankcase of an engine. VP104 Super Pro Pump with single #10 intake line running So, say you are at relatively low vacuum and at some rpm, and are picking up 0% aerated oil at 10gpm. The negative crankcase pressures (a.k.a. Although purely passive, the system proved remarkably efficient, and thousands of racers used them religiously until the emergence of modern external vacuum pumps. All rights reserved. Racing dry-sump applications are a little different. Please consult your engine builder for the proper vacuum level for your engine. After assembly each pump is tested on our pump dyno at 3500 rpm (Sportsman pumps), 2500 rpm Pro pumps and 1900 rpm Super Pro pumps. Morosos Scott Hall agrees that 12-15 inches of vacuum is the common number that most engine builders like to see, because it yields good power gains and it is relatively easy to achieve that amount of vacuum. But the Cup system also comes with a lot of complexity and maintenance, and for hobby-level racers dry-sump oiling systems arent usually legal. Micro vacuum pump 12V air-liquid diaphragm pump Kamoer EDLP600 mini water pump high flow rate air pump set liquid flow600ml/min, gas flow1L/min. Crankcase Vacuum Technical Information - Dry Sump Oil Pumps for Racing Engines - High Quality, Unbeatable Price. Another source of vacuum could be the oil pump. The size and speed of the evacuation pump, along with the size of the vacuum line, control the amount of vacuum. For engines around the 600 hp range, we advise using our I was talking with a mechanic who used to run drag cars, and he said that he used a small vacuum pump off the crankcase to put a partial vacuum into the oil system, providing more thorough lubrication of the engine. The vacuum pump is a Moroso unit (PN 22642), which is designed to be spun up to 8,000 rpm. MUSTANG Smog Pump Air Injection COBRA 4.6 DOHC Electric Crankcase 96 97 98 JLJ | eBay. 4" should be fine, but i'd look for some air leaks or blowby if it's drawing oil during normal street driving. Vacuum leaks in the crankcase, valve covers, distributor base, timing chain cover, oil dipstick, etc. The pump is usually mounted on the side of the engine and is driven by a belt or chain. at 64% of crankshaft speed and #12 inlet line. Fortunately, Peterson Fluid Systems recently introduced a new belt-drive oil pump and vacuum pump combination that looked like it would fit our needs. This time around we saw peaks of 617 lb-ft of torque at 6,000 rpm and 771.8 hp at 7,400 rpm. Obviously they are doing that because it helps create horsepower. The vacuum will increase horsepower by allowing the use of low-tension compression and oil rings. The availability of 3D Model downloads of our vacuum pumps is an industry first. It is common to see the Those are improvements of 8.2 and 16.4, respectively. Properly sized modern pumps easily overcome these smaller vacuum leaks while using the control valve to maintain the desired vacuum. GZ Motorsports offers an extensive range of all inclusive kits that are sized and equipped for specific applications. I installed an electric vacuum pump on the Vega to maximize the potential horsepower by giving the engine negative crankcase pressure and hopefully eliminate. No I understand blow by. Make sure that the exhaust fitting is positioned between the 5 oclock and 8 oclock position if you can, suggests Hall. Condition: New. Big Block Chevy. GZ Pumps are rated by approximate horsepower, not by cubic inches as a small STAR Machine specializes in crankcase vacuum technology for the motorsports industry. This month I checked out a bolt-on power adder of sorts, well more of a power enabler, in the form of an Aerospace Components vacuum pump kit. Pressure evacuation reduces this effect. Talk about creating horsepower out of nothing! The vacuum your engine will make is dependent on the amount of blow by it generates and any air leaks it may have. The O.D. Race engines not only see higher rpm than a stock engine, but they often also have more corrosive oil/fuel mixtures pumped through them. We have all the crankcase vacuum pump kits and parts you need. Of course, if you have significant blow by, you're gonna get oil mist out the breathers. We provide you with the exact weight, dimensions and performance of our products. Found crankcase drawing vacuum,enough that the oil cap is hard to remove and the engine stalls as though it has massive intake leak, nothing has been touched or altered other than a injector.I am currently a master tech, just never seen this happen,looking for . Ring Packages such as low tension rings typically generate an increase in ring blowby requiring a larger, or faster spinning pump. 2023 Power Automedia. Rather than putting a breather on the valve cover to let crankcase pressure out, pull the air out with a pump to create a vacuum. Lowering the pressure inside the crankcase with a vacuum pump can increase power because the crankshaft has less drag - just as an airplane can fly faster in the thin air at high altitude than it can in the denser air at low altitude. Weld-In Aluminum Valve Cover Breather Set, 1-3/8 Inch Tube, Allstar Performance ALL34145 Allstar Performance Crankcase Evacuation Systems | Summit Racing. vacuum it will make on a given engine. The Aerospace Components vacuum pump is made from high-quality 6061-T6 billet aluminum, including the carrier for low rotational mass. Build your own custom newsletter with the content you love from Dragzine, directly to your inbox, absolutely FREE! Closer tolerences in the new diecasting allow the Pro Pump to generate 26% more air flow than similar sized competitors pumps! So the goal is to create a whole bunch of nothing in the crankcase to help the engine produce power as efficiently as possible. By adding a vacuum pump, it will help relieve the crankcase of that pressure. In our own in house testing, You can easily pick up 20+hp on most engines. $16.25. Actually an OEM pump is a very reliable pump, designed for many years of use because there's thousands of hours in GM and Ford engineering in them. Included are the 321 stainless steel saddle mount fitting, mounting clamps, vacuum valve assembly and a complete safety by-pass with a .25 psi internal pop-off valve. the use of a vacuum control valve. They were readily available in junk yards and auto parts stores at a reasonable cost. But, the oil volume (through the engine and bearings) will increase, and this ultimately protects the components by drawing the heat away from (them). The double-baffled tank is 9-inches tall and includes the necessary fittings. Nov 19, 2014. Pump manufacturers like GZ Motorsports and Moroso have each addressed this in their own way so the end consumer can make a thoughtful choice based on his needs and interpretation of their individual pump features. Since the large port intake didn't perform very well, we sent it to Wilson Manifolds between dyno sessions for their competition porting work. For high output power adder engines we highly recommend the use of a data logger to monitor vacuum levels downtrack. Video: Chris Moore Shatters Stock-Wheelbase Motorcycle Records, Retro Injection: Modern Fuel Injector Tech Gives Us Room To Grow, How We Fixed The Unsightly Wheel Gap And Stance On Our 2010 Camaro, Lizzy Musi Preparing For Street Outlaws: No Prep Kings Season 6, Improved ring seal by relieving crankcase pressure below the rings, Reduced friction by allowing lighter tension rings, Reduced windage around the rotating assembly, Minimized cavitation (in wet sump applications), Improved bay to bay breathing in Y-block configurations, Improved power via reduced mixture contamination. Another option is to evacuate the crankcase and valve cover by pulling a negative pressure on it. GZ Motorosports offers complete kits for numerous applications, including LSX builds (PN SPVPKLSX). 2007 - 2023 Typically a high-rpm engine will need to bleed off a greater amount of air to regulate the crankcase vacuum because the pump will be turning at a much higher rpm since it is connected to the engine. At the upper range of External crankcase vacuum pumps will provide significant power gains on both racing and high-performance street engines, primarily by promoting superior ring sealing. The vanes are made from carbon fiber for durability and light rotating weight. 12 Volt Electric Vacuum Pump. GZ operates quietly, and stealthy under your hood without annoying click clicks Mitsubishi 4G63T Vacuum Pump Complete Kit. Moroso Billet Aluminum Vacuum Relief Valve, Racing Crankcase Vacuum Pump 4-Vane Dry Sump, Service Kit, V-Belt Crankshaft Pulley The machine work, engine assembly, and dyno testing was performed by Gray's Automotive in McMinnville, Oregon. 70. Pump speed is determined by the drive ratio between the crank pulley and the pump pulley. (800) 230-3030 For the vacuum pump test, Moroso's recommended default pulleys-a 2.5-inch-od V-belt crank pulley (PN 23520) and a 5-inch-od AIR pulley (PN 64895)-were installed to drive the pump at 50 percent of . Unlike the others, GZ pumps use a proven vane design that doesn't stick! With the vacuum pump pulling (vacuum) up through the middle of the engine, it causes the oil to slow down its return rate to the oil pan. These steps are now unnecessary with current pump technology that applies proper pump sizing and speed along with vacuum control valves to produce predictable results. But blow by would be forcing air out of the breathers which is why many high mileage engines develop oil leaks and thus crankcase pressure. Qty: Add to Cart In both dry- and wet-sump applications it is advisable to plumb an independent pressure balance line connecting the crankcase or oil pan to a valve cover or the lifter valley. Evac systems really work best with low-tension oil-ring builds, which is common in drag race builds. Details. Racing Vacuum Pumps are belt driven. Moroso produces more vacuum pumps for performance applications than anyone, so we called up Thor Schroder, Morosos marketing and new product manager for some more info. From a simple vacuum gauge to a dedicated channel on a data logger, crankcase vacuum pressure is often monitored and plotted along with all the other relevant engine data to provide a more detailed picture of how crankcase pressure affects performance. reduce the amount of vacuum you will generate. Our goal is to get A Pan-Evac system connects the valve covers on both sides of the engine to the exhaust header collectors with one-way check valves and vent tubes that blend into the exhaust stream at approximately 45 degrees. For more info on their LSx vacuum pumps check out GZ Motorsports website, or give them a call at 209-296 . Location. & Data Recorders, Moroso, Billet Aluminum Vacuum Relief Valve, 3/8" NPT, Moroso, Billet Aluminum Vacuum Relief Valve, 3/4" -16 Thread, Moroso, Racing Crankcase Vacuum Pump, 3-Vane, Wet Sump, Moroso, Racing Crankcase Vacuum Pump, 4-Vane, Dry Sump, Moroso, Racing Crankcase Vacuum Pump, 4-Vane, Moroso, V-Belt Crankshaft Pulley, 2.5" Diameter, Moroso, V-Groove Crankshaft Pulley, 4" Diameter, Moroso, Drive Mandrel, Chev BB, Vacuum Pump/Oil Pump Drive, Moroso, Drive Mandrel, Chev SB, Vacuum Pump/Oil Pump Drive, Moroso, Vacuum Pump V-Belt Pulley, 5" Diameter. Many engine builders monitor crankcase vacuum throughout the engines power range. A Crankcase Evacuation System vents fumes into the exhaust system. We will safeguard your e-mail and only send content you request. Here's a listing for a Mustang Cobra air injection pump, the listing says that it can be used as a crankcase vacuum pump. best results as your power levels near 750 HP for the VP101/VP102 Pumps. And with 20-40hp gains normally seen with the Aerospace Components vacuum pump, bolt-on horsepower isnt just a term regulated to the forced induction/nitrous oxide injection power adder market. View Details. Buy an electric crankcase evacuation system from JEGS High Performance today! All pumps come with a properly sized pulley and Aerospace Components offers mandrels to fit any engine application. The recently redesigned Pro Racing Vacuum Pump is a purpose built pump specifically designed for the hot, wet and oily environment found in race car crankcase vapors. This blow by airflow creates a positive pressure in the crankcase, the vacuum pump "sucks" air out of the crankcase with its negative airflow. 2014 Audi A4 Sedan (8K2) L4-2.0L Turbo Engine code (CAED) WAUAFAFL4EN031138 diag . Original 3-Vane Vacuum Pump Kit. The left gauge is the input pressure and the right side is the amount of loss. GZ Motorsports responded with a larger, high flowing, VP104 Super Pro 33 CFM Vacuum Pump. To complete the conversion, we needed to replace our dry sump pan with a wet sump pan, but that just took a phone call to Summit for a Moroso aluminum pan. The excessive oil expelled out of the breathers is due to the valvetrain oil drainage being pushed back up the same hole that the crankcase is using to relieve pressure.
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