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AvgasStrip only.
AvgasStrip only.
I ran that for a while on the Dyno. It's only 100 octane but it is 1/2 the price. But it didn't hurt the engineAvgas
Its only 200 psi right? The static comp is ultimately meaningless as its comes down to when you close the intake valve as that's when you start to compress the mixture.I ran that for a while on the Dyno. It's only 100 octane but it is 1/2 the price. But it didn't hurt the engine
Yep, 72 degrees abdcIts only 200 psi right? The static comp is ultimately meaningless as its comes down to when you close the intake valve as that's when you start to compress the mixture.
Interesting, I’d recommend the exact opposite. Start with 112 and get a baseline tune up in it then strip away octane until the power starts to go away, that’ll give you your limit. I’d rather start with too much octane. On the dyno the fuel price is what it is. But you’ll know what your engine wants.I'd start with a five gallon can of your pump 108, make a couple short dyno pulls, and see what you get. If you don't like what you see, 112.
Thanks that great information.Read this thread:
SOME HOLLEY CARB TIPS - Page 8 - PY Online Forums - Bringing the Pontiac Hobby Together
The engine dynoed was built to run Sonoco 112 BUT it made more power on Avgas because of the lower cylinder pressures UNTIL the rings finally ran themselves in and the cylinder pressure increased requiring the 112.
"AV-gas is a consistant fuel that is the same everywhere in the world and its the same all year and it evaporates easily inside the engine to create a good homogenous mixture throughout the cylinder. Av-gas has just about the highest energy content of any petrol, racing fuels or not. Race fuels are made from av-gas. Av-gas is the stuff to use. I dont understand why people wont tune to run it. It tunes to run nice at light load to keep cylinder condition correct for changes to WOT. Its easier to idle on the line with it. It is far more forgiving of a bad engine combination than street unleaded is. Its cheaper than race fuels."
AV gas has altitude additives in it that your engine doesn't need. Just a little FYI.Okay, I was wrong again lol.
I have 110 sonoco at the pump. Or I have av gas at the pump (airport).
Everything else is in 5 gallon cans or 55 gallon drums.
Basically I just need to make up my mind.
Thank you all for your input. I appreciate you all.
Interesting, I'll have to check that out.AV gas has altitude additives in it that your engine doesn't need. Just a little FYI.
Get 5 gallons of sonoco 110 and 5 gallons of 91-93 whatever is high test. That will get you through your dyno session. 11.6:1 with 260@050 on intake and aluminum heads doesn’t need some crazy high octane number. Start rich with low timing and 110 and keep inching up on the tune up and adding pump gas to the mix. You’ll find your safe tune up and octane level. Then you get to put it in the car and do it all over again.Okay, I was wrong again lol.
I have 110 sonoco at the pump. Or I have av gas at the pump (airport).
Everything else is in 5 gallon cans or 55 gallon drums.
Basically I just need to make up my mind.
Thank you all for your input. I appreciate you all.
It's 12.8 now [email protected]Get 5 gallons of sonoco 110 and 5 gallons of 91-93 whatever is high test. That will get you through your dyno session. 11.6:1 with 260@050 on intake and aluminum heads doesn’t need some crazy high octane number. Start rich with low timing and 110 and keep inching up on the tune up and adding pump gas to the mix. You’ll find your safe tune up and octane level. Then you get to put it in the car and do it all over again.
How the F…. did I miss that?It's 12.8 now [email protected]
Will do, thanks !Buy 10 gallons of 110. Or run it on E85. Have fun. Make sure to post pics/videos and tell the Rat hi.
That is a very valid testing procedure alternative.Interesting, I’d recommend the exact opposite. Start with 112 and get a baseline tune up in it then strip away octane until the power starts to go away, that’ll give you your limit. I’d rather start with too much octane. On the dyno the fuel price is what it is. But you’ll know what your engine wants.
I can't write out sentences properly, I went back and edited the 1st postHow the F…. did I miss that?
Its only got 200 cranking psi.How the F…. did I miss that?
No you did just fine. I remembered the cam change but I still wrote it wrong. I just completely looked past the compression increase.I can't write out sentences properly, I went back and edited the 1st post
Tim said hi .No you did just fine. I remembered the cam change but I still wrote it wrong. I just completely looked past the compression increase.