Compression Ratio Octane Chart

What octane gas do big bore high compression guys run?

I've calculated my compression to be 10.34 and i'm not worried about running pump gas. Today's pump gas is too volatile and cannot tolerate high compression ratio (above 10.5:1) and high cylinder pressure (above approximately 165 psi) without risking detonation. I run 89 octane (usually marathon), have initial timing at 14, running a vacuum advance off of the manifold, and.

Octane Vs Compression Ratio Chart

Typically if you run aluminum heads you can set your engine up to say 12:1, but since you have the aluminum heads you dissapate heat faster so you can get away with using a lower octane fuel and still get the higher compression. I had it cut down to 0.002. When looking in the magazines and on the net you.

Live in California and want 93 Octane for the Diablo performance tune

I've found the idle quality is better with 89 vs 87 (maybe just a figment of my imagination). Hello chuck, the cam timing versus static compression ratio chart was taken from information provided by crane cams engineers. I am running a new gm 350 engine. With a blown motor you are shooting for the same compression as a na motor.

FOTW 1043, August 20, 2018 Engine Compression Ratio and Gasoline

I run 89 octane (usually marathon), have initial timing at 14, running a vacuum advance off of the manifold, and 36 degrees all in at 2500 rpm. And it aint got no turbo. Hello chuck, the cam timing versus static compression ratio chart was taken from information provided by crane cams engineers. I currently own an engine with a cr.

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Also, how high will my compression ratio be with said cam and flat top pistons installed in my motor rated at 8.5:1 cr stock? I installed afr 190cc aluminum heads with 68cc chambers and straight plugs. And also consider the deck height; But look out for the fuel! I've calculated my compression to be 10.34 and i'm not worried about.

Compression Ratio Octane Chart - Hello chuck, the cam timing versus static compression ratio chart was taken from information provided by crane cams engineers. It makes a big difference in calculated static compression. But look out for the fuel! Fuel octane boosters or expensive racing gasoline will be necessary if too much cylinder pressure is generated. I've calculated my compression to be 10.34 and i'm not worried about running pump gas. Also, how high will my compression ratio be with said cam and flat top pistons installed in my motor rated at 8.5:1 cr stock?

I am running a new gm 350 engine. And also consider the deck height; I've calculated my compression to be 10.34 and i'm not worried about running pump gas. It makes a big difference in calculated static compression. I installed afr 190cc aluminum heads with 68cc chambers and straight plugs.

It Makes A Big Difference In Calculated Static Compression.

Hello chuck, the cam timing versus static compression ratio chart was taken from information provided by crane cams engineers. I've found the idle quality is better with 89 vs 87 (maybe just a figment of my imagination). The cam i installed is comp cam 280h magnum. I have a 532 bbf in my mach 1 with 12.5:1 and i run 92 octane ive never had a issue and i spin her to 7k.

I Have 75Cc Combustion Chambers, (They Have.

Nitromethane has a very low octane rating, what kind of crs and induction pressures do you think those guys. Today's pump gas is too volatile and cannot tolerate high compression ratio (above 10.5:1) and high cylinder pressure (above approximately 165 psi) without risking detonation. And it aint got no turbo. But look out for the fuel!

There Are Many Other Factors Involved.

I am running a new gm 350 engine. I run 89 octane (usually marathon), have initial timing at 14, running a vacuum advance off of the manifold, and 36 degrees all in at 2500 rpm. Cr and induction pressure, alone does not determine the need for higher or lower octane. I had it cut down to 0.002.

Also, How High Will My Compression Ratio Be With Said Cam And Flat Top Pistons Installed In My Motor Rated At 8.5:1 Cr Stock?

And also consider the deck height; I currently own an engine with a cr of 9:1 and it requires 100 octane or greater. Typically if you run aluminum heads you can set your engine up to say 12:1, but since you have the aluminum heads you dissapate heat faster so you can get away with using a lower octane fuel and still get the higher compression. When looking in the magazines and on the net you get a lot of variances on the listed compression ratios.