- Jan 4, 2011
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Some time ago I built an Upshur Horizontal Twin and was never able to get it to run. I just could not get compression. I blamed it on rings or poor bore and finally just set it aside for a while. Later I built a similar engine of my own design but larger with 1" bore c 1 1/4 stroke. I again have a non running engine. I have made new rings and honed the cylinders but still no compression. The thing which has be baffled is that the engine has great suction on the intake stroke but no compression. With the head removed when I put my hand over the bore it has great suction and will even hold the vacuum for a long time but almost no compression. It obviously is not valve leakage or head gasket because this is with the head removed and just my hand sealing the bore. Also there are two cylinders and both act the same way. It would seem that if a piston works in one direction it should work in both directions. What am I missing?