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Top dead centre explained

neoeagle

Just got it firing!
Joined
May 21, 2018
Messages
10
Location
Switzerland
A great video to help with getting valve adjustment right! Explains overlap very well too.
Not a Guzzi engine but the principle applies!

 
Mine is too much happy Guzzi. He laugh too loud. :D:D
I re-adjusted valve at tdc but now on full compressed stroke, no overlap, all valves completely close.
He laugh quieter but healthier. :*
 
A loud valve is a happy valve. If quiet, clearance may be tight and the valve could burn.
Not TOO loud! Tappet clearances which are too large cause problems of their own. I work on "whatever the book says +1 -0". However, you're right: you should be able to hear them happily ticking away.
 
A loud valve is a happy valve. If quiet, clearance may be tight and the valve could burn.
Yes, but if you put the piston at TDC on overlap instead of TDC on compression your clearances will be way to much. I think that was the moral of the post, make sure you know the difference between TDC on compression (when both valves are 100% closed) and TDC on overlap (where both valves are actually open).
 
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