Well, I have no noticable loss of power. I've been reading too. Some place I read that idle speed is around 1200 and max is 3600. Because I'm not running at max rpm, is it possible car fixed jet carb isn't leaned out all the way?
Cooling the combustion was one of my objectives to stop dieseling, which it appears to have happened.
I change oil every 75 hours. Just changed the oil. Be interesting to see how long I can go before the oil looks like dirt. It only takes 2 qts so it's oil changes is no biggie.
Removing carbon was another objective, it too is happening.
In the past I was using the next step hotter plug to plug from carboning up. I went back to the oem plug and things have improved.
My last concern is winter time blend, colder more dense air. Colder air requires me to richen up my marvel carb on Jubilee by 2 full turns in winter to make power. I don't use an ethanol blend on Jubilee, but it has super white plugs just like my IH C. Both tractors are very good on gas. I use them in summer to mow. I think they use about the same fuel to mow an acre as a riding mower uses.
BTW, I noticed a gas station selling E30 fuel at the same price as E10. So where is the savings when E30 gives less mpg?
Thanks for telling me I'm on the right track. Not everyone seems to agree. George
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