Posted by JD Seller on January 13, 2018 at 16:51:01 from (208.126.196.24):
In Reply to: Hey Old posted by rohdog50 on January 13, 2018 at 09:41:23:
rohdog50: The reason your need to run with the choke out is the colder air is more dense. So your able to get more oxygen into the motor in colder temperatures. Thus you need more fuel in to make the mixer not be lean. This is a major issue with tractor pullers. Air temperatures effect the amount of fuel or water you inject into the tractor to have maximum HP/RPM. Go to a tractor pull that is later in the fall and watch some of the fellows having trouble getting off the line. Their tractors are too lean to get the fire going like they are used too in hot weather.
I am not sure but if I remember correctly some of the older airplanes were set up to where you could adjust the mixer while in flight. They had the air density problem due to altitude and temperature.
As for running the better fuel. I can tell you the majority of the gas tractors and small motors around this part of North-Eastern Iowa will not run very well on the lower octane, ethanol added, 87 fuel. It must be regional as many fellow say theirs runs like it was new again on the lower grades of gas.
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