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Re: Re: Re: Re: Lead substitute - use it or not.
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Posted by dick on February 27, 2001 at 07:47:07 from (63.120.111.98):
In Reply to: Re: Re: Re: Lead substitute - use it or not. posted by the tractor vet on February 26, 2001 at 19:17:17:
Actually, I think you've got it partially backwards. The higher octane fuels contain more of the lighter components in crude oil and fewer of the heavier components. The lighter components tend to ignite at lower compression ratios than the heavier components (such as iso-octane), which make them unsuitable for use in high-compression, high-performance engines where they ignite prematurely causing engine knocking. Most if not all antique tractor engines have LOW compression engines, which don't require high-octane gasoline to prevent knocking - I believe many of these engines were originally designed by IH to use gasoline with octane ratings as low as 70. However, the heavier components in higher octane gasoline generally will contain a higher carbon-to-hydrogen content ratio than that in lower octane gasoline. Carbon generally will produce more heat when burnt than hydrogen will, so the higher octane fuels should burn a bit HOTTER than the lower octane fuels, although probably not all that much. Plug fouling tends to be reduced by hotter plugs, or activities which produce more heat in the engine (such as plowing), and thus your observation of less plug fouling when using higher octane fuel is consistent with the higher octane fuel burning hotter than lower octane gasoline, and not the other way around.
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