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Cranking pressure ?
Posted: January 3rd, 2009, 5:22 pm
by Gearhead88
I'd like to get an idea on what some of these engines we've built make for cranking pressure , measured with a compression guage.
Mines a short rod , twelve counterweight 4.7 with + .060" unmolested Sealed Power #677CP pistons. Piston dish volume on these is 15.1 cc
Cranking pressure is 185 psi
What's yours ?
Re: Cranking pressure ?
Posted: January 3rd, 2009, 7:35 pm
by gremlinsteve
sounds good to me. whats the quench? which cam is this?
steve
Re: Cranking pressure ?
Posted: January 3rd, 2009, 7:39 pm
by dwg86
185 cranking pressure? what gas do you run?
Re: Cranking pressure ?
Posted: January 3rd, 2009, 7:46 pm
by gremlinsteve
true but what can and at what quench. ive run stuff over 250 cranking on 93 pump with no issues.
a/f and a good tuner would help also.
steve
Re: Cranking pressure ?
Posted: January 3rd, 2009, 8:09 pm
by Gearhead88
I only run premium , there's no way I'll run with mid or reg.
Cam is Comp # 68-232-4 , installed straight up.
Quench is not where I could / should have set it , I'll have to look at my build notes to get a number , I remember not being happy with it and went ahead any way due to a very long backlog of work at the machine shop I used and could not stomache yet a further delay to the completion of the engine. I was thinking about freshening the engine in the future and dealing with it then . I am building a second engine that will not be under such tight time constaints so I could take care of the quench on that one . The next one will probably be a long rod / four counterweight version , I'm still gathering parts and have a nice cylinder head prepared to use on it.
No tuner used on this one either , , I did use Accel 24 lb/hr injectors , Rubicon express 62mm throttle body , ported head w/ stock sized valves , Bank's full exhaust system.
I'm planning on adding an air /fuel ratio guage in the near future.
Other than busting a few rocker arms , it's been a great engine.