Fuel

Whats happenin all?

I have always thought for the longest time that if you use too high of a octane in a engine that it will kill performance. I am talking almost extremes here, like 93 octane in a engine with 6:1 compression.

I always based my argument that higher octance, although can tolerate more compression, burns slower. was I right? It makes sence because don't you have to advance the timing for higher octane fuel?

One more thing, all modern computer controlled engines with a knock sensor, will it advance timing all the way until the engine begins to knock then back off a little, or is there a preprogrammed limit?

Now i don't want to start a war over if 93 gives you more power, just the questions above.

thanks a million,
-CJP

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-cjp

thats what octane is all about the higher the number the slower it burns thats why 12-13:-1 compression motors cant run on 87 they would detonate, the fuel would ignite way to early during the compression stroke

on a computer controlled engine it will advance the timing and modify plenty of other settings to keep a stoichiometric fuel/oxygen ratio... ya know 13.7:1

I thought that was 14.7:1?

it is 14.7:1 to be stoichiometric but, the computer tries to achive that, but normally settles for 13.7 in driving conditions.

Denny, you ever feel like you have a monkey on your back? :LOL:

Quote:

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Originally Posted by DennyW

:LOL: Yep, he gives me a wack every now and then also. :LOL:

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What's that Monkey's Name ? :LOL: :LOL: :LOL:

Thanks for the replies!
Awesome i was on the right track the whole time. :3dSMILE:

-CJP