GETTING THE MOST PERFORMANCE FROM VACUUM PUMPS: Moroso Vacuum Pump PN: 22640 and 22641 can be driven no faster than 6500 RPM. The Moroso Vacuum Pump PN: 22642 and ­­­22643 can be driven as high as 8000 RPM. Moroso offers many ratio options for two reasons. First, by spinning the pump fast enough to achieve the desired vacuum at staging RPM is critical to getting the most performance from your vacuum system. Typically the amount of vacuum it makes below your staging RPM is not as important as it is when you are under a load and ready to make your run. Second, with engines that either run on alcohol, are supercharged or turbocharged, having the pump spin to maximum RPM to maintain vacuum is necessary in some cases. This will decrease the life of the pump, but will achieve the desired results.

• 4-Vane Vacuum Pump Kit
• Natural Aluminum Finish
• Mounting Bracket Included
• Pulls 13.9% more vacuum
• Wet or dry-sump
• Maintenance-free precision sealed roller bearings
• 4.375 O.D. body, 5.050 from back of pump to pulley mounting flange.

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Information:

Enhanced Design 4-Vane Vacuum Pump Kit; Natural Aluminum Finish; Mounting Bracket Included; Enhanced Design pulls 13.9% more vacuum; Can be used efficiently on wet or dry-sump engines; Achieves greater vacuum sooner, virtually maintenance free; 4-Vane design weighs less than original style pumps; Designed with maintenance-free precision sealed roller bearings; Natural aluminum finish designed to be polished, interior hard coated for wear resistance; 4.375 O.D. body, 5.050 from back of pump to pulley mounting flange; AVAILABLE OPTIONS: PN: 63903 Vacuum Pump Idler Pulley Kit and PN: 97642 Vacuum Pump Vane Kit; REPLACEMENT PARTS: PN: 97641 -12AN Replacement Fittings, PN: 22626 -16AN Replacement Fittings, PN: 97181 Rebuild Kit (Enhanced Design Pumps).