Piston/Rod questions on the project.
Registered User
Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
I like the words you're giving me and I am sure you wouldn't be saying this stuff if it weren't true, but how does anybody know what IS and was IS NOT safe to run when it comes to Compression Ratio vs. Boost vs. Octane? Are there general guidelines published somewhere or are you talking from experience?
The only literature I have on this displays a generic graph and shows that in order to run 15psi on 9:1 CR, I would need about 110 octane. It is from Corky Bell's "Maximum Boost"; I do wish he had been more descriptive on where the information derived from in the generation of that graph. Whether or not there was an intercooler, intercooler efficiency, compressor efficiency could all be variables in that calculation. Again, I am not disagreeing with your statements, but being new at this, I would be more comforted if I knew supporting facts on the subject to go along with it.
....I wish this project counted as a technical elective in my aerospace engineering curriculum. My report would certainly contain a statement along these lines ..."turbochargers were originally designed for use on aircraft to overcome the low air density at high altitudes. My LT1 seems to have A.D.D. (altitude density deficiency) even at sea-level. Therefore, it was imperative to turbocharge this motor in order to satisfy the beast."
The only literature I have on this displays a generic graph and shows that in order to run 15psi on 9:1 CR, I would need about 110 octane. It is from Corky Bell's "Maximum Boost"; I do wish he had been more descriptive on where the information derived from in the generation of that graph. Whether or not there was an intercooler, intercooler efficiency, compressor efficiency could all be variables in that calculation. Again, I am not disagreeing with your statements, but being new at this, I would be more comforted if I knew supporting facts on the subject to go along with it.
....I wish this project counted as a technical elective in my aerospace engineering curriculum. My report would certainly contain a statement along these lines ..."turbochargers were originally designed for use on aircraft to overcome the low air density at high altitudes. My LT1 seems to have A.D.D. (altitude density deficiency) even at sea-level. Therefore, it was imperative to turbocharge this motor in order to satisfy the beast."
Thread Starter
Registered User
Joined: Dec 2001
Posts: 1,026
From: Ohio
After calling JE, they steered me away from the SRP's real quick like and said they were for a smaller supercharger application and lower boost. Those pistons will buy me .1 CR lower over the SRP's also.
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Joined: Dec 1969
Posts: 10,745
From: Buffalo, New York
15psi at 9:1 on pump gas is borderline. Of course water injection and intercooling will help. Regardless, don't expect OEM levels of reliability if you use the boost a lot. I'd count the water injection as a necessity for such a combo.
Rich
Rich
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