This Acme engine has a factory CR of 1:4.15 and was designed to run on kerosene, there are similar engines with a higher CR of 1:5.6 that are made to run on gasoline.
This head has a factory displacement of approx 115cc, which I reduced to approx 90cc, this head and a thin head gasket will give a CR of approx 1:6.5, and that will be a big change when running on wood gas, Tom, I hope so , so that this item will not lie on the shelf for a long time.
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You probably get more done in a day than I do in a month Tone. I used to do a lot better. Still haven’t gotten back to the saw mill gasifier since summer. Getting pretty sick of working on food storage though.
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Really interesting project. Flatheads make it easy(easier) to increase an engine’s compression ratio. I’m surprised you aren’t taking it higher still? Wood gas is happy well above 10:1. Maybe the gas flow dynamics would be impaired by such an aggressive reduction of the “head space”?
My woodgas “plan” engine is a Predator 670cc which has the now more common over head valve configuration. It is 8.3:1 compression from the factory and harder to modify because of the valve position but I had a head shave in mind. Not sure how much clearance it has but a little clay would tell you.
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brought at home tired legs and some treasures of the scrap…
pistons with 4 rings, magnetos in unknown conditions, carburettor, oil level sticks, pressure column, cylinder…with water traces all, but will see what is to reuse…
the kohler motor- electricity generator, i have posted recently in life goes on topic was left by the american army in 2 world war here, me told the scrap man
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I believe a lot of the Post-WW2 Italian tractors were made from various tank parts, were they not?
“Why waste all that good steel and tracks, wheat has to be planted, make it a tractor.”
Or from the Bible, “Arms into Ploughshares”
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the pistons from the scrap yield have 4 rings, 2 are oil rings…
in the acme motor, a good friend has given me, the piston has only 1 oil ring…
this piston but has a split on one side, so i think it is better to change.
what is the difference, or better, using 2 oil rings or only 1…?
what say our motor experts here?
thanks for answers
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