pp129-140_VacuumPumps:2009
9/30/09
5:02 PM
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VACUUM PRODUCT PUMP INFORMATION HEADER
PROPERLY MAINTAIN YOUR MOROSO VACUUM PUMP Moroso recommends that your Vacuum Pump be cleaned on a regular basis for optimum performance. When performing any maintenance, wear approved safety glasses. Loosen the vacuum pump pulley bolts and remove the pulley. Remove the vacuum pump from engine and remove bearing cap from the back of the pump.
VACUUM PUMPS & ACCESSORIES
Remove the rear cover from the pump housing, remove the vanes from the rotor slots noting the notches on the bottom and top of the vanes face towards the shaft and the worn in edge of the vane curves to match the shape of the rotor. Remove the front cover and rotor shaft assembly. Disassemble rotor from shaft. Clean all pieces, (vanes, housing, rotor & shaft, front & rear covers, bearing cap), using a mild part cleaning solvent or soap and water. Inspect parts for wear or damage. If rebuilding is necessary use the correct rebuild kit for your 3-vane or 4-vane pump or contact Moroso Performance Technical Service Department at (203) 458-0542 for information on how we can service your pump. When all pieces are cleaned and ready for assembly, place the rotor shaft keys onto the shaft. Install rotor onto shaft being careful to keep the shaft keys in place.
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Next, place the rotor, shaft and front cover assembly into the housing. Replace the vanes making sure the vane notches are facing the shaft and the curved “worn-in” surfaces are facing the housing. If you are using new vanes, they will not have a curved end, follow the instructions provided with the Rebuild Kit. Replace rear cover and bearing cap. Install and tighten the front and rear cover hardware and bearing cap screw. Re-install pump onto your engine.
Q: How fast should I drive the vacuum pump for best results? A: As a base line, all Moroso Vacuum Pumps will work at 50% of engine speed. Our Drive Kits are designed to work with the pump pulleys to achieve the proper ratio. Q: What if I need more vacuum? A: In applications that require more vacuum at a lower engine RPM (i.e. at idle or at staging RPM) or through the entire RPM range it may be necessary to increase the drive ratio of the pump. Consult your Moroso Technical Advisor for assistance in choosing the proper drive ratio. Q: How fast can I drive my vacuum pump? A: Moroso Vacuum Pumps Part Nos. 22640 and 22641 can turn no more than 6500 RPM shaft speed. Moroso Vacuum Pump Nos. 22642 and 22643 can turn 8000 RPM maximum shaft speed. Q: What is the best way to care for my new Moroso Vacuum Pump? A: Keep it clean. Q: How often should I rebuild my vacuum pump? A: As a “rule of thumb”, it is generally good practice to rebuild your vacuum pump after 300 runs. Upon physical inspection it is recommended to rebuild your pump when the vanes are sitting below the rotor surface .100" or greater. Other key indicators for rebuild are excessive bearing or shaft wear. Rebuild kits are available from Moroso. Moroso Vacuum Pumps, like any part on a race car, require some up keep to ensure good performance. Q: How much vacuum is enough? A: Leading engine builders and race teams confirm that on wet sump systems, 10" to 14" of vacuum will create additional horsepower and minimize oiling system related problems. Dry sump engines should be kept in the range of 18" to 22" Hg. Although normally capable of achieving greater vacuum levels, it is best to consult a professional engine builder if higher levels of vacuum are desired. Moroso carries a variety of vacuum relief valves to adjust the maximum amount of vacuum an engine will make. Q: Why does my alcohol engine make less vacuum? A: Engines running alcohol typically see less vacuum than an engine that runs on gasoline. This is from the ring sealing characteristics between the two fuels. Q: When is the best time to check my vacuum and oil pressure? A: The best time to check vacuum and oil pressure together is during your trans brake check. At your staging RPM, monitor what your vacuum and oil pressure is. This is the most consistent way of knowing what condition your system is in. Q: Where should the inlet of my Moroso vacuum pump be plumbed? A: Moroso Vacuum Pumps are most commonly plumbed to the front or top of a valve cover. Using Moroso Part Nos. 22634 or 22635 Positive Seal Fitting with a built-in baffle, no welding is required on the valve cover. This fitting allows a small amount of oil to flow through the pump for increased lubrication. Be sure to consult the Moroso catalog for a listing of all the accessories needed for your application.
Phone: 203.453.6571 Fax: 203.453.6906