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Please restate the question.

If my engine has not had a timing key installed or the heads milled or by any other means raised the compression ratio, what will 104 octane do for me?

a) loss horsepower
b) cost you excess money to operate
c) cause you to get beat in a race by a similar sled on 87 octane
d) all of the above

Answer:

D



Just having fun. If you are basically stock you are wasting horsepower and money.
 

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some idiot filled my F7 with 104 and it ran like total shit til i ran it all out.
took 4-5 pulls to start, and throttle response was really poor.

replaced with 87 and starts on 1-2 pulls now, with nice snappy response.
 

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I'm not sure what the real effect of a whole lot of un-burnt fuel would be?? Would it cause piston wash? Carbon build-up? Fouled plugs?? I really don't know!! :hmm: But I know that an engine designed (compression & timing) to run on 87 will not completely burn a higher octane fuel, esp. something as high as 104, so there will be un-burnt fuel. I'm just not sure in what "state" that fuel would be in? (again, would it still be semi-liquid, perhaps cause piston wash?? ... I dunno?!)
 
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