Quote:
Originally Posted by Capinoy123
yeah weisco .020" over rings and pistons
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Ok 1 more time for the record.
You have .020" over pistons with the matching ring set, you will need a machine shop to bore and hone the block to fit.
All after market piston makers sell there pistons with file to fit rings, some have the oil control rings pre gaped for a specific bore size or range of sizes.
It is needed to file to fit your rings, even if the oil control rings are "pre sized" its a good idea to check this to make sure.
There is a specific ring end gap per inch of bore, this varies a little pending ring type, make, and what the engine is intended for.
Most compression ring end gaps end up around .020", bigger if more heat is intended. Things that cause heat in the cylinder are: boost, compression, ignition timing, A/F ratio, exhaust manifold, turbo, exhaust, Nitrous, and what type of fuel you are using just to name a few. And less then .020" if you have more of a stock setup with no intentions of going to a bigger setup, but that brings up the question as to why build a motor then. The scrapper ring is normally set a little wider then the compression ring, but I have heard of people running them a little tighter, the idea being less heat makes it to the scrapper ring, they for less thermal expansion. Again you do not want to run to tight other wise the ring end gaps butt into each other and that is not good. So if you run a .020" gap on the compression ring I would run a .022" ring end gap on the scrapper.
Then there is what type of ring end gap cutting method do you use. Also be sure to de-bur the ends of the rings and most rings have a top and a bottom, so make sure they are installed right. And there is a specific place to put each ring end gap, so they do not line up after the piston is installed, the piston/ring company should have information on how to install the rings.
If you do not have a handle on EVERY aspect of building a motor, just do not do it. Plain and simple if you mess up on even the smallest detail it will cost you WAY more to fix it a 2nd time then to just pay someone to build it in the first place. There are a lot of reputable engine builds, ask a lot of questions and take notes.
Good luck with your setup.
~John