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Tractor Pulling Discussion Forum

Re: The right fuel for high compression engines

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Dave Thompson jr

03-14-2013 15:15:07

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Cliff when Paul built my engine he recommended 112 octane I have used 110 and it started and ran the same. I think as long as there is no detonation in the cylnders the lower octane will work.

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north puller

03-15-2013 14:56:31

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 Re: The right fuel for high compression engines in reply to Dave Thompson jr, 03-14-2013 15:15:07  
Curious Dave, what the CR and CI, and PSI is of your motor?

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Dave Thompson

03-16-2013 15:47:43

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 Re: The right fuel for high compression engines in reply to north puller, 03-15-2013 14:56:31  
Im just running a 540 cu and the compression could be increased. Just a 450 gas head Ross pisons and a good set of connecting rods. Could have a lot more. Plenty of power for a division 3 tractor. My next one will be a case so I can give Gary Baker a good run for his money.

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Cliff S

03-14-2013 20:50:47

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 Re: The right fuel for high compression engines in reply to Dave Thompson jr, 03-14-2013 15:15:07  
All of my tractors can run on 87/91 depending on how Hot it is Out BUT one and I use Sunoco 112 in it but I am shure its around the same compression you are!

Cliff S

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03-14-2013 16:19:31

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 Re: The right fuel for high compression engines in reply to Dave Thompson jr, 03-14-2013 15:15:07  
Lower octane gives more power. You want the lowest octane you can run without spark knock

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