Question about adjustable lifters
Stellar HDF Member
Joined: Sep 2007
Posts: 2,447
Likes: 663
From: Vancouver Island B.C.
Thanks a lot, Sir. Yes, you are perfectly right about the method of feeling the blow on the finger, but at that time I had not installed the push rods and the valves would have then been closed also on TDC overlap. And then the TDC:s would have blown air both of them.
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Road Captain
Joined: Aug 2018
Posts: 589
Likes: 93
From: Stockholm
Update
Hello,
Thought I would update my threads. Good news so far. Bike runs great and I measured 190 PSI (Cold Cranking Compression at sea level) on both cylinders. This means 9.2:1 corrected compression, which is very satisfying.
I calculated with BigBoyz 186 PSI and 9.0:1, so I got a little more :-)
Thank you all for good advices and teaching. Without this forum I would never been able to make this build.
Ride safe and best wishes.
Oak Mountain Rider
Stockholm, Sweden
Thought I would update my threads. Good news so far. Bike runs great and I measured 190 PSI (Cold Cranking Compression at sea level) on both cylinders. This means 9.2:1 corrected compression, which is very satisfying.
I calculated with BigBoyz 186 PSI and 9.0:1, so I got a little more :-)
Thank you all for good advices and teaching. Without this forum I would never been able to make this build.
Ride safe and best wishes.
Oak Mountain Rider
Stockholm, Sweden
Supporter
Joined: Oct 2022
Posts: 912
Likes: 826
From: Texas
Overlap is the point where the exhaust valve just closes and the intake starts to open. This assumes you're turning the crank in the direction it would be turning if the engine was running.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
More succinctly, overlap is the distance of crank rotation from when the intake opens to when the exhaust closes typically as piston reaches top dead center on the exhaust stroke and starts the intake stroke. It's typically measured in degrees of crank rotation at some small specified lift of the lifter.
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