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BillDube@killacycle.com wrote:
In the car, all the intake valves are open at something like 6500 RPM (maybe even lower.) My manifold emulates the stock manifold in this condition. Should work OK for the expected RPM operating range.
With a 2:85 PSRU, the max prop RPM will be 3157. As I understand it, this should not be a problem for a 72 inch prop. You just have to pitch it correctly to absorb 243 HP at that RPM (at altitude.)
Bill, I think Ed was saying that if you pitch the prop to absorb 243HP at 3157, then it will be producing ?160HP? at ?2000RPM?. You're engine will be turning 5700 with the prop at that RPM. The question is, "Will 5700 engine RPM produce 160HP or greater?" If you don't get >160HP at 5700 RPM, you'll never be able to get TO the 243HP that is sitting there waiting for you. A CSprop would let you feather it past the lower RPMs and bring you into the sweet nirvana where you manifolds tuning works at its maximum. With a fixed pitch prop, it may be questionable until you build one and try to run it.
How'd I do, Ed?
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,|"|"|, Ernest Christley |
----===<{{(oQo)}}>===---- Dyke Delta Builder |
o| d |o www.ernest.isa-geek.org |
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