|Jason1Pa said: (quoted from post at 11:30:25 01/29/13) They did come packed together and I didnt mixed them up however the one that I did try did move up and down but it seemed pretty snug. the block was checked and had a .001 taper from top to bottom. I guess when pushed in it made that much of a difference. I wasnt at the machine shop when he tested the pistons. The machinest was talking to a friend that just did a 9N and he warned him to go on the high side with the specs due to the fact that these newer pistons tend to swell up after the engine gets nice and hot. The friends 9N would run great but if you shut it off and tryed to restart the engine would be too tight. If you'd wait a while and cool it down it would fire back up like a champ..|
Where is everyone getting these engine kits that arn't from TISCO? I've never came across parts that arnt made from there.
The .001 taper on the block bore is fine. The sleeves are pre-finished and shouldn;t need any fine tuning. I take it you didn't do the installation of the sleeves or fit the pistons to the sleeves after they were installed. So you are reporting the story a you got it from the shop???
I just checked Melling and they stock prefinished and unfinished sleeves for the 120 engine. Unfortunately the manufacturing dimensions in their catalog are clearly not trustworthy - a couple are actually mathematically impossible. I would want to talk to one of their sales reps before I ordered anything from them. FWIW their standard diameter tolerance is -.001/+.001.
TOH This post was edited by TheOldHokie at 08:09:27 01/29/13.