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It really depends on the motor, heads(iron/aluminum), cam. For example an older iron head 350 with a small cam with 9.8:1CR will need 93 maybe even octane booster. While a small bore aluminum head engine could run 89 maybe even 87 depending on cam size.

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Q: What is the correct octane rating for 9.8 to 1 compression ratio?
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What is the correct octane rating for 10.5 to 1 compression ratio?

is it right 92

If you run a Honda 50cc dirt bike on 110 octane gas what will happen?

Congratulations you have just added to the Misinformation Superhighway. Stock specs for Hondas is about 10:1 COMPRESSION The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting. The compression ratio of your engine determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more

What octane gasoline must be used in an engine with 10.5 compression ratio?

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1958 Cadillac what octane of gas?

Cadillac 1958 with the compression ratio of 10.25:1 should not run on gas below 98 octane.

Can the Oldsmobile aurora run on regular gas?

It can ..but the compression ratio require 91 octane minimum...

Is it possible to determine an octane rating from a vapour?

The octane rating of a substance is a measure of its resistance to autocombustion when compressed. By definition, isooctane has an octane rating of 100, and n-heptane a rating of 0, and all others are in comparison to these two.There are various ways to measure the octane rating of a substance. On way is determined by running the fuel through a specific test engine with a variable compression ratio under controlled conditions, and comparing these results with those for mixtures of isooctane and n-heptane.For other more information, and for the source of this information, see the Wikipedia link under the Web Links to the left of this answer.

What is the spontaneous combustion of the charge commonly caused by low octane fuel or excessive compression ratio?


What fuel octane does a 1975 El Camino use?

By '75 they had reduced the compression ratio significantly, so you can use the cheap stuff. 85 octane is high enough.

What is the octane level for a 1991 Chevy Caprice?

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What are uses of iso-octane?

ISO-octane, or 2, 2, 4-Trimethylpentane is mainly used in the production of gasoline. When added, it reduces engine knocking. The addition of ISO-octane is what is referred to when a gasoline's octane rating is referred to, and a 100 rating is when only ISO-octane is added to the gasoline. A zero rating is when only heptane is added, so the various ratings refer to the ratio and blends added to fuel.

Does compression ratio effect octane requirements?

Yes, the higher the compression ratio, the more octane the fuel has to be. Anything over 10.0:1 has to be 91 or higher. However, if performance is not an issue, than you can use any type of fuel you want, but car will not accelerate fast and its torque curve will be very bad. Using low octane fuel in a high compression engine will also cause knocking (pinging, pinking). This will cause damage if continued.

Engine knock in a 2.2 Chrysler?

what is the compression ratio and recommended gas octane? try a higher octane fuel and see what happens, mileage may go up also.