FlatheadsForever87
Member
What all do you builders lapp when building an engine. Flathead or OhV or 2 cycle. Just curious.
Getting lapped?
- Thread starter FlatheadsForever87
- Start date
FlatheadsForever87
Member
Me too I figured you would know all about that by now lol.
TritonJrBluePlate
Member
Did you ever learn about this subject? I’m trying to find out the best way to lap some rings in my clone build.
flattop1
Dawg 89
Heres my opinion .
Need a fixture too hold the ring .
I assume at the proper size or desired size . Similar too what was used on flatheads to tirm
them in a lathe .
A perfectly round cylinder sized accordingly. Either spin pump up and down or best , both .
An ultra fine lapping compound .
Need a fixture too hold the ring .
I assume at the proper size or desired size . Similar too what was used on flatheads to tirm
them in a lathe .
A perfectly round cylinder sized accordingly. Either spin pump up and down or best , both .
An ultra fine lapping compound .
flattop1
Dawg 89
No . There was either a post or something mentioned about it .
flattop1
Dawg 89
This might have insight.
https://www.homemodelenginemachinist.com/threads/lapping-machine-for-piston-rings.31217/
https://www.homemodelenginemachinist.com/threads/lapping-machine-for-piston-rings.31217/
flattop1
Dawg 89
Recently found this . In the archives.
Copy and pasted .
( would also make tension adjustments on the top and second rings from Burris. I had multiple cast iron sleeves of slightly different bores to process the rings. Stack about a dozen rings in the appropriate sleeve, put in the oven and set temperature to about medium low and shut the door. After a predetermined time I would remove them from the oven and wait until they assumed room temperature. After this procedure they were lapped on top, bottom and od. The od process involved a rotating sleeve turning (about 30-100 rpm) that the od of the ring was lapped inside. The sleeve made of chilled iron, ID honed (fun process) and of various sizes rotated while the ring was stroked up and down the bore with diamond paste. Under magnification but barely visible with the naked eye, after lapping there was a very very fine cross hatch that could be seen on the bore contact face of the ring, it probably lasted about 3 seconds of run time, but it looked cool.)
Copy and pasted .
( would also make tension adjustments on the top and second rings from Burris. I had multiple cast iron sleeves of slightly different bores to process the rings. Stack about a dozen rings in the appropriate sleeve, put in the oven and set temperature to about medium low and shut the door. After a predetermined time I would remove them from the oven and wait until they assumed room temperature. After this procedure they were lapped on top, bottom and od. The od process involved a rotating sleeve turning (about 30-100 rpm) that the od of the ring was lapped inside. The sleeve made of chilled iron, ID honed (fun process) and of various sizes rotated while the ring was stroked up and down the bore with diamond paste. Under magnification but barely visible with the naked eye, after lapping there was a very very fine cross hatch that could be seen on the bore contact face of the ring, it probably lasted about 3 seconds of run time, but it looked cool.)