[TRADERMIKE 2012]

Originally Posted by 78w72

thats very true. but what happens when you increase the volume of ethanol to compensate for the lower BTU? i have never had an engine set up for that but i know some people that do & most say ethanol has some benefits like cooler & cleaner burning etc. for high compression or turbo/forced induction engines the higher octane E85 is what lots of guys use. plus its cheaper than any comparable octane fuel.

as you mentioned, i have never really noticed a difference in 91 straight gas vs 93 with 10%E in 3 different pontiac engine cars, the higher HP one at the drag strip or driving any of them around town. i try to stick with straight 91 but will get the 89 or 93 ethanol if its cheaper.

Mikes Reply:

Living in south Florida on a cool night in the winter the 1967 428 HO loves the higher 93 octane with 10 % Alcohol but the next day it is 90 degrees and the Alcohol takes affect and starts vapor lock issues. Then I have to go to the Rec- 89-90 fuel, less Alcohol.

[78w72]

Originally Posted by TRADERMIKE 2012

Mikes Reply:

Living in south Florida on a cool night in the winter the 1967 428 HO loves the higher 93 octane with 10 % Alcohol but the next day it is 90 degrees and the Alcohol takes affect and starts vapor lock issues. Then I have to go to the Rec- 89-90 fuel, less Alcohol.

your engine vapor locks at 90f?? even with all the cooling mods, phenolics & heat wrap? if so, something somewhere is not right...

[Scott65]

Originally Posted by 78w72

your engine vapor locks at 90f?? even with all the cooling mods, phenolics & heat wrap? if so, something somewhere is not right...

Please don't provoke the thread killer