Over the years, I have also experimented with all types of carbureted engines. I have heard of putting smaller jets in carburetors and getting better mileage and I have heard of installing larger jets with increased mileage. It all depends on what the gas/fuel ratio was before starting.
In the 60s & 70s I specialized in automatic transmissions, air conditioning, and carburetor. Attended so many classes, I can't remember them all. If I remember correctly, in one of my carb. classes, the instructor advised us that the optimum gas/air ratio of any internal combustion engine was 14.6:1. At this ratio and under the right conditions, all of the gasoline and all of the oxygen can burn leaving nothing except for the combustion products. This is called the "stochiometric" ratio.
Years ago, I decided to build a modified version of a standard carburetor. I spent many hours fabricating and experimenting with a small lawn tractor carb. and got the results I was searching for.
I filled a small gas container with a measured amount of gasoline and the engine ran for a few minutes and seconds at a set RPM.
I then installed my modified carburetor and ran the SAME test. The engine ran over three times a long, and had unbelievable throttle response-----GOT IT!!
There was only two problems:::The engine did not produce enough power to move the machine out of my shop, even in the lowest gear!!
Second problem was the engine got dangerously HOT!
Scrapped that idea and remembered another statement my instructor made-"There is only so much energy in a gallon of gasoline!"
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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