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11-11-2009, 03:14 AM
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#1 |
Status: Venerable Member
Join Date: Jan 2008
Location: Southern Illinois
Posts: 1,258
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BSFC numbers for Gas & Alky
It's been a while since I've needed to know these numbers..... So I'll ask where I think I'll get a reliable answer.
What BSFC numbers do you usually want to be at when running Alky? What BSFC numbers do you usually want to be at when running Gas? What is the formula for figuring these numbers? Thanks in advance. Don
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11-11-2009, 04:57 AM
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#2 |
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Location: WI
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Don, I don't know half as much as you but we were shooting for .450 on my junk. I am sure that one was the easy one.
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Jake  "The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man." -George Bernard Shaw |
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11-11-2009, 10:23 PM
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#3 |
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Status: Venerable Member
Join Date: Jan 2008
Location: Southern Illinois
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Yea I was thinking Mid .40s for Gas,...and something around 1.0ish for Alcohol. But I couldn't remember for sure.
Our Dyno program always did the calculation for us after some data was entered. So I never did learn what the equation is. Don
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11-15-2009, 03:18 PM
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#4 |
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Location: Ocean City, MD
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It is usually 2.125 to 1 over gas, so if your .450 now, .990 up to 1.100 or so. Turbo is way more
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11-15-2009, 05:29 PM
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#5 |
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Status: Venerable Member
Join Date: Jan 2008
Location: Southern Illinois
Posts: 1,258
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Thanks Bill,...I knew I could count on you.
Don
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11-29-2009, 02:22 PM
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#6 |
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Status: Venerable Member
Join Date: Oct 2007
Location: Ocean City, MD
Posts: 1,873
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jfyi, gas btu around 19,000 alky is 8000/9000 @ best. So you can figure from there. GAS btu's are amazingly close even with higher octane. Would not think so but the flame travel in time per octane with proper compression is very close. Alky is slower but still makes decent power even though you nearly double the wet fuel vapor in the intake and head runners.
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