Compression Ratio Octane Chart

The Octane Game

And it aint got no turbo. Nitromethane has a very low octane rating, what kind of crs and induction pressures do you think those guys. With a blown motor you are shooting for the same compression as a na motor but with lower compression you have more volume at tdc that the blower can force extra af into to bring.

Mechanical Engineering Octane Number

I had it cut down to 0.002. Exhaust valve lift with factory rocker arm ratio 0.524 lobe separation (degrees) 110 i don't want to buy 93 octane gas to cruis around town, so my question is, how high of a compression ratio can i run on 89 octane gas? And it aint got no turbo. I'm building a 385 similar.

Octane Vs Compression Ratio Chart

I've found the idle quality is better with 89 vs 87 (maybe just a figment of my imagination). But look out for the fuel! Cr and induction pressure, alone does not determine the need for higher or lower octane. With a blown motor you are shooting for the same compression as a na motor but with lower compression you have.

What octane gas do big bore high compression guys run?

And also consider the deck height; I've calculated my compression to be 10.34 and i'm not worried about running pump gas. 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.

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

But look out for the fuel! 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? Cr and induction pressure, alone does not determine the need for higher or lower octane. It makes a big difference in calculated static compression. I am running a new gm.

Compression Ratio Octane Chart - The cam i installed is comp cam 280h magnum. I've found the idle quality is better with 89 vs 87 (maybe just a figment of my imagination). I've calculated my compression to be 10.34 and i'm not worried about running pump gas. When looking in the magazines and on the net you get a lot of variances on the listed compression ratios. And it aint got no turbo. I recently measured an engine i'm rebuilding to have 0.027 deck height.

Nitromethane has a very low octane rating, what kind of crs and induction pressures do you think those guys. I've found the idle quality is better with 89 vs 87 (maybe just a figment of my imagination). There are many other factors involved. When looking in the magazines and on the net you get a lot of variances on the listed compression ratios. With a blown motor you are shooting for the same compression as a na motor but with lower compression you have more volume at tdc that the blower can force extra af into to bring the compression back up more af= more power.

Exhaust Valve Lift With Factory Rocker Arm Ratio 0.524 Lobe Separation (Degrees) 110 I Don't Want To Buy 93 Octane Gas To Cruis Around Town, So My Question Is, How High Of A Compression Ratio Can I Run On 89 Octane Gas?

But look out for the fuel! When looking in the magazines and on the net you get a lot of variances on the listed compression ratios. I've found the idle quality is better with 89 vs 87 (maybe just a figment of my imagination). 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 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. 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. With a blown motor you are shooting for the same compression as a na motor but with lower compression you have more volume at tdc that the blower can force extra af into to bring the compression back up more af= more power. Cr and induction pressure, alone does not determine the need for higher or lower octane.

There Are Many Other Factors Involved.

I am running a new gm 350 engine. 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. The cam i installed is comp cam 280h magnum.

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.

These guys also say that for running pump gas, cranking pressure should not exceed 165, although i have witnessed fellows using 200+ with everything matched up well and the chamber and piston cleaned up to prevent hot. I'm building a 385 similar to skunk's (72cc heads). Hello chuck, the cam timing versus static compression ratio chart was taken from information provided by crane cams engineers. And also consider the deck height;