Re: Engine cranks; no compression?
I think you are not correct in assuming the timing is out by 20 degrees, all the timing marks should align at 40 degrees and you only mention two of them. The two you mention will always align with the copper links at some point because they are directly connected by a fixed set of links in a chain. All the copper links, timing marks, with the pointer at the 40 degree line up at some point and seemingly only after four engine turns each time.
One turn of the engine will turn each gear by the exact number of teeth on the crank shaft sprocket, so the maths has to be done to calculate how many turns of the crankshaft equals one complete engine firing cycle. Seemingly the magic number is four. Your engine is at one of these four turns, which one is the question.
So I would gather from the four turns we can assume that the cam shaft pulleys have four times the teeth than the crankshaft and balance shaft pulleys.
Last edited by onehundred80; Dec 27, 2015 at 10:18 AM.