octane?
Road Warrior
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RE: octane?
ORIGINAL: Jehu
99, You are correct but I respectfully disagree with one small statement, that temperature and pressure are independant of eachother.
99, You are correct but I respectfully disagree with one small statement, that temperature and pressure are independant of eachother.
It means exactly that one influences the other.
[/quote]
Higher octane works against a more violent explosion and more forcefult hrow of the piston on the power stroke. It does, as you state, burn slower,cooler and longer which, while counter-performance is better for reliability.
Like the S&S engineer said to me when we were talking about the then-prototype X-Wedge engine a few years agao, I asked "What horsepower ratings will it be capable of and ultimately released in?" He said as to the latter about three different numbers which I forget - but, most importantly, as to the first part of my question, he said, "How long do you want it to last."
Top fuel drag engines last a pass or three and their existance is completed. General Aviation aircraft air/oil cooled piston engines generally develop one-half hoprsepower per cubic inch. i.e. a Lycoming O-360 (4 cylinder Opposed 360 cubic inch) will typically be only rated for 180 horsepower - but they last foreverburning 100 octane low lead fuel.
Like the S&S engineer said to me when we were talking about the then-prototype X-Wedge engine a few years agao, I asked "What horsepower ratings will it be capable of and ultimately released in?" He said as to the latter about three different numbers which I forget - but, most importantly, as to the first part of my question, he said, "How long do you want it to last."
Top fuel drag engines last a pass or three and their existance is completed. General Aviation aircraft air/oil cooled piston engines generally develop one-half hoprsepower per cubic inch. i.e. a Lycoming O-360 (4 cylinder Opposed 360 cubic inch) will typically be only rated for 180 horsepower - but they last foreverburning 100 octane low lead fuel.
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Joined: Nov 2007
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From: Texas
RE: octane?
I have had 4 Ultras and 3 Sportys and none of them ran worth a dam unless ya used 91 or HIGHER. I have tried many different times and many different brands. ALL were a no go! If it works for you GOOD DEAL.
Wish it would work for me.
Wish it would work for me.
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