How to determine octane rating necessary for certain compression ratios?
06-21-2002, 07:28 PM
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How to determine octane rating necessary for certain compression ratios?
Maybe I'm just a confused soul, but I was trying to figure this out today. (See topic.) Say for example, you have a B18C5 setup and you bump compression to 12:1. Change the ECU to fuel cut / rev limit at ~9300... (is that even pertinant?) -- how do you determine the octane rating necessary to keep your engine safe/clean?
My first thoughts were FI applications. They cram the air in the combustion chamber, and typically run on pump gas. Using race gas they can add more boost... but, is there a difference for NA applications? Would 12:1 require a higher octane?
Perhaps I'm not asking the right questions... Assuming the car could run on 93 octane pump gas @ 12:1, would you typically make more power and be more efficient running say 100 octane?
Sorry if its drawn out... just trying to get a better understanding. Thanks in advance for the input.
My first thoughts were FI applications. They cram the air in the combustion chamber, and typically run on pump gas. Using race gas they can add more boost... but, is there a difference for NA applications? Would 12:1 require a higher octane?
Perhaps I'm not asking the right questions... Assuming the car could run on 93 octane pump gas @ 12:1, would you typically make more power and be more efficient running say 100 octane?
Sorry if its drawn out... just trying to get a better understanding. Thanks in advance for the input.
06-21-2002, 07:44 PM
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Re: How to determine octane rating necessary for certain compression ratios? (trooth)
Perhaps I'm not asking the right questions... Assuming the car could run on 93 octane pump gas @ 12:1, would you typically make more power and be more efficient running say 100 octane?
06-28-2002, 09:45 PM
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Re: How to determine octane rating necessary for certain compression ratios? (trooth)
The proper question would be , " how much more fuel" , and the difference would be minimal. The higher octane could actualy cause more of a problem if the higher compression were to cause a lean condition due to inadequate fuel delivery...tuning is everything.
[Modified by white, 6:47 AM 6/29/2002]
[Modified by white, 6:47 AM 6/29/2002]
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