Technical > Spud Miller's Cave

pump under drive?

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wideopen231:
Spud,

If have apump too big for need. Whats best way to figure under drive ratio. I have cpl old Waterman under drive sitting here  different ratios. I have a 85. gpm pump.Too big for injected alky w/o going either bigger on main than I want or small nozzle and higher pressure. It will work great when I get set up and want to throw a high percentage load to it. Need few other parts first and thats after new trailer. May be have to have two complete systems I can swap from alky to nitro,just checking options and trying to make most versatile with fewest changes possible.
  Any rule of thumb for figuring pump out put with under drive.Linear or just totally changes chart characteristics?

Paul New:
You could belt drive it than it would be simple to slow pump down

dreracecar:
Over/under drives are ok for small % of change, but trimming the amount needed is plain impractile  just buy the correct pump and be done with it.   You are asking close to a 75% reduction running off the crank that spins 2X the cam speed right off the bat, and a custom drive off the cam could cost more than a new pump and may not work

wideopen231:
have a 8.5 and looking to get down to 7 so roughly 20% flow reduction . I have a 15% and what appears to be 20 to 22% with rough check on it. I guess I could hve pump flowed and use flows at rpm pump would be at to give be ball park idea. Hoping Spud will chime in.

dreracecar:
Go over your post again and edit, you typed in "85." GPM and that is what my comment was referring to.   I ran a 110 (13 gpm) on my car where an 80A (6.5gpm) would work. just went to a 130 main instead of a 75 main.  More parts to fail by using any type of XX drive

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