Re: Glowing M

Posted by Bob M on August 17, 2006 at 10:35:36 from (151.190.254.108):

In Reply to: Re: Glowing M posted by the tractor vet on August 17, 2006 at 09:44:13:

When I was in engineering school (early 70’s) we ran a bunch of lab dyno tests on a Waukesha tractor engine - same as found in the Oliver 1800 or 1850 I believe... Also on a Jeep F-head and a Chevy 283.

We learned with these engines in stock trim switching from from 87 to 93 octane – also 100 octane av-gas) had no measurable effect on maximum power. In fact over long duration runs the highest octane fuels occasionally resulted in LESS power on account of lead fouling of the plugs and misfiring (this was still in the days when tetraethyl lead was the usual way to increase octane...)

However running by higher octane fuels it did let you make adjustments (like more advanced timing, running higher compression heads etc .) that would otherwise cause excessive knock/detonation in the engines. And these changes - in combination with the higher octane - gas DID result in significant increases in power.

Bottom line is we learned that simply switching to higher octane fuel and making no other changes accomplished nothing.

Incidentally we parked the last gas tractors in the mid-70's. We run 'em now only for parades, hayrides, pushing snow and the like. Their poor fuel economy relative to the diesel simply left 'em in the dust!

Replies:

• Re: Glowing M Ron in Nebr 23:54:02 08/17/06 (0)

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