Quote:
Originally Posted by leathermang
Can you not visualize the fact that the movement of the piston is TINY....and for several degrees NOT AT ALL .... when the crank throw is at the top of its rotation cycle ?
Measuring from a distance before... to the same distance after it starts back down and marking the spot half way in between is the standard ACCURATE way to measure it...
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During my winter madness I spent quite a bit of time messing about measuring cam profiles and piston heights - I put quite a bit of information in this thread:-
OM617 (non turbo) cam profile specs, piston height specs etc
When I was measuring the piston height with a DTI I didn't see the dial not moving for several degrees. If I remember correctly it was quite a sudden change as the piston came up the bore, reached TDC and then returned back down. It just goes to show doesn't it? You can never measure too much eh? Now do I need to dig the engine out the back of my garage and prove it to you?