posted August 16, 2004 11:08 PM
well....it's all a matter of opinion on what grit to use, but you are Pi$$ing in the wind with any grit if the cylinders are not round. here is what I use......
Chrome I use a 220 grit
Cast I use a 280
5/64 moly I use a 280 to finish and then run the plateau brush hone through it a couple of strokes
1/16 @ 1.5mm moly of any kind, I finish with a 400 and then run the plateau brush hone through it a couple of strokes
Keep in mind I am using torque plates bolted to both sides, the mains are torqued up and the freeze plugs are in, and I get the cylinders stright and round within .0002(two tenths of one thounsandth)......my point is that unless you are prepared to spend thousands in cash to buy all this equipment....take the block to a good machine shop around you....it will be worth it in the long run! He (or she) can also work with you on what rings you should run. if you do this you can expect to get a little more power and life out of your engine. DO IT RIGHT!
but if you insist on doing this yourself at home, get yourself a 280 grit "dingle berry" hone (AKA flexhone) and use it, do like the guy stated above and use cheap cast rings and you will get pretty good results.
as far as crank polishing goes...if the crank is wihtin specs you can use a 400 grit wet and dry paper....cut it into strips as wide as the crank journal, wrap it all the way around the journal, then take an old shoe string and wrap it all the way around the journal on top of the paper and use it to turn the paper. when you pull the string back and forth, pull outward towards the ends of the crank so the srting travels from one side of the journal to the other, rotate the crank a 1/4 turn every now and then so the journal gets about the same pressure all the way around. if you really want to get a nice finish, go to wal-mart and in the automotive section around the paint and bondo....they sell some little packs of 800 grit wet and dry paper...use it after the 400 and you will be impressed with the finish.you can get 1000,1500,and 2000 grit paper at wal-mart too,and I have done this,it makes the crank look like polished chrome, BUT if you do this, the oil will bead up and roll off the crank surface when the engine is not running,and this will lead to bearing wear beacuse of "dry starts".
one more thing....use WD-40 on the paper when polishing. and make sure you clean the crank REAL GOOD after you do all this.
Hope this helps some.
[This message has been edited by engineman (edited August 21, 2004).]