| 1. |
GZMS vacuum pumps are designed to have oil pass through them, and require oil for lubrication of the wipers at the vanes. Experience has shown that synthetic oil yields a longer pump life. A dry pump will wear out prematurely due to friction between the Rulon wipers and the carbon fiber vanes. GZMS vacuum pumps are warranted for one year in drag race use. GZMS vacuum pumps are not warranted for street use at this time. If a pump is returned that has been run dry, any warranty is void. |
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| 2. |
GZMS products are installed and used by others, no warranty is made as to use of products as regards performance or safety. Motorsports are inherently dangerous, the user of GZMS products assumes all potential or real risk of using those products.
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| 3. |
GZMS vacuum pumps should be run with a pulley ratio of .5 to .75 (small crank pulley, large pump pulley) with a maximum pump rpm of 5000. GZMS Sportsman vacuum pumps are successfully run at a 1 to 1 ratio, however, this is not recommended. Pumps used on the street should be run with a pulley ratio of .5 to minimize wear. An independent oil source for street use is suggested. |
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| 4. |
Net vacuum in a wet sump drag race engine should not exceed 15" hg max at maximum rpm. Many engine builders recommend 10" to 12". Dry sump engines can be run at 20" hg net. Check your vacuum on the dyno or on the track. Install a vacuum control valve if you exceed recommended vacuum level.
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| 5. |
GZMS pumps are manufactured in our shop. 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. During testing 20/50 racing oil is run through them so when you get your pump you will see "blackened" oil at the inlet and outlet ports. This is normal and due to break in process. GZMS vacuum pumps all show the test vacuum and date tested on the face of the pump. This is the test value at the test rpm noted above. |
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| 6. |
The vacuum your engine will make is dependent on the amount of blow by it generates and any air leaks it may have. No two engines are identical. |
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