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Re: what octane to run??
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Posted by John T on October 21, 2005 at 11:06:15 from (66.244.90.98):
In Reply to: what octane to run?? posted by fenton on October 21, 2005 at 10:49:43:
I dont see higher octane as much help in reducing valve wear, but as harder to ignite (as octane increases) to prevent pre ignition spark knock when higher compression necessitates it. Most older tractor engines ran relatively low compression, such that 87 octane is sufficient to prevent pre ignition, while running higher octane then necessary (harder to ignite) gas is only a waste. I do agree the lead (or a substitute) can reduce valve wear by lubing and cushioning the "valve to seat" impact and preventing sticking, but was not aware in unleaded gas increasing the octane could serve any similar function?? I guess what Im saying is if valve wear is an issue, I would address it by adding lead or substitutes as opposed to using higher octane gas, and in most stock compression tractors 87 octane is plenty. Take care n have a good weekend John T
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