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| newbie piston installation question https://www.slantsix.org/forum/viewtopic.php?t=42243 |
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| Author: | drtwgn [ Tue Oct 12, 2010 4:10 pm ] |
| Post subject: | newbie piston installation question |
I was installing .040 over pistons, and the third one I did did not want to go in the bore. It turned out that one of the little tabs at the bottom of the piston skirt was somehow hanging up. After a few rounds with a file (and plenty of cleaning), the piston does go in, but it is a very slightly bit tighter fitting than the first two pistons feel. It rotates freely in the bore (grabbing the piston head and twisting), so I believe the bores are round. SO the questions, how much slack should there be between the skirt and the cylinder wall? I have never seen anything about measuring this. Is this filed piston safe to use? Has this happened to some of you? Thanks and Peace |
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| Author: | Fopar [ Tue Oct 12, 2010 4:22 pm ] |
| Post subject: | |
Did you install the pistons by the number stamped on the rod or might have been written on the top of the pistons by the machinist?? Richard |
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| Author: | Doc [ Tue Oct 12, 2010 4:47 pm ] |
| Post subject: | |
.001 to .002 clearance is about right for a cast piston... more for a forged or Hypereutectic (sp) piston. I would try that piston in a different bore to see if you get a better (looser) fit. To be honest, a good engine builder (and the factory) measures, sorts and "matches" the pistons with the bores so they end-up with the needed amount of clearance. DD |
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| Author: | drtwgn [ Wed Oct 13, 2010 8:05 am ] |
| Post subject: | newbie piston installation question |
I am installing based on numberr on connecting rod. I was with the machinist, and we did not test fit pistons before installing on con. rods. THis is going to be a daily driver, not a racer, if that matters. all other pistons seem to have just a tiny bit of wiggle in their appropriate cylinders; the one in question has just a tiny bit less. Its more like snug. Bores are pretty uniform diameter top to bottom, doesnt seem to be a taper, based on measuring the gap in an oil ring placed in the bores. |
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