Fuel octane for stock Raptor
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03-02-2003, 03:19 PM
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#2
03-02-2003, 05:10 PM
Fuel octane for stock Raptor
Only higher compression engines will benefit from increased octane. You will not run hotter with 92 octane compared to 89 in a STOCK motor.
Actually, the fuel with a higher octane rating resists ingiting more than the lower number. The reason is in a higher compression engine, lower octane fuel pre-detonates (pings) and you need a fuel that is resistant to detonation so it runs properly. Therefore, a high compression engine on low octane runs hot. A low compession engine does not encourage pre-detonation and 89 octane is all ya need. Also, you can run 110 octane race gas in a STOCK motor all day long and it wont get any hotter than normal - you'll just waste money on gas.
You are likely wasting money on 92 octane with a stock motor - 89 will be fine. Until you bump up the compression there is no "need" to run higher octane fuel. Engine compression is the factor that determines the need for increased octane.
This is one of the most mis-understood concepts out there today. I've quickly learned this because I have to run race gas in my off-road race car (12.25:1 compression) and when ya buy it 100 gallons at a time you really feel the pinch of higher octance fuel !
Hope this helps - Eric
Actually, the fuel with a higher octane rating resists ingiting more than the lower number. The reason is in a higher compression engine, lower octane fuel pre-detonates (pings) and you need a fuel that is resistant to detonation so it runs properly. Therefore, a high compression engine on low octane runs hot. A low compession engine does not encourage pre-detonation and 89 octane is all ya need. Also, you can run 110 octane race gas in a STOCK motor all day long and it wont get any hotter than normal - you'll just waste money on gas.
You are likely wasting money on 92 octane with a stock motor - 89 will be fine. Until you bump up the compression there is no "need" to run higher octane fuel. Engine compression is the factor that determines the need for increased octane.
This is one of the most mis-understood concepts out there today. I've quickly learned this because I have to run race gas in my off-road race car (12.25:1 compression) and when ya buy it 100 gallons at a time you really feel the pinch of higher octance fuel !
Hope this helps - Eric
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