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Re: Question about compression ratio and octane
[Re: Thumperdart]
#2262465
03/03/17 01:41 AM
03/03/17 01:41 AM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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170-175 cc at 12.1.1 comp............  That's what you gotta look at. A cranking compression of 170 - 180 will usually safely live on 92 pump gas. Over 180 and you better have all your  in a row.
Fastest 300
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Re: Question about compression ratio and octane
[Re: Crizila]
#2262723
03/03/17 04:14 PM
03/03/17 04:14 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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170-175 cc at 12.1.1 comp............ That's what you gotta look at. A cranking compression of 170 - 180 will usually safely live on 92 pump gas. Over 180 and you better have all your in a row. Another important factor when pushing the limits is VE, my stroker SB is probably not getting a real high VE with smallish magnum heads but my PSI is real high. If it was flowing real awesome as the RPM went up I would probably have much higher PSI from the inertia of the gas flowing in the cylinder that I would have big issues. Thats my theory, someone smarter has my permission to debunk it.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Question about compression ratio and octane
[Re: HotRodDave]
#2262762
03/03/17 05:50 PM
03/03/17 05:50 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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170-175 cc at 12.1.1 comp............ That's what you gotta look at. A cranking compression of 170 - 180 will usually safely live on 92 pump gas. Over 180 and you better have all your in a row. Another important factor when pushing the limits is VE, my stroker SB is probably not getting a real high VE with smallish magnum heads but my PSI is real high. If it was flowing real awesome as the RPM went up I would probably have much higher PSI from the inertia of the gas flowing in the cylinder that I would have big issues. Thats my theory, someone smarter has my permission to debunk it.  for sure. Dyno #'s.
Fastest 300
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