Northstar rebuild: Will style (Page 34/119)
Will JUN 12, 07:47 AM
No, never.
Nashco JUN 19, 02:40 PM

quote
Originally posted by Will:

I've placed an order for 11.5:1 pistons... there goes another G...



Details?
Will JUN 20, 07:20 AM
The Ross pistons were heavier than I'd like. I didn't think about compression enough when I ordered the first set of CP's with deeper than stock valve reliefs. I ordered these with the same valve reliefs, but a net +3.5 cc dome. The grooves are cut for the diamond lapped TS rings that I bought. I'm going to have these coated ceramic tops & moly skirts.

[This message has been edited by Will (edited 06-20-2007).]

mrgrimes JUN 20, 06:08 PM
Will, Alan Johnson sells a pistion when combind with a .040 gasket will produce 11.8:1 Did you port your cylinder cambers, if so what did they cc at? I received my 12:1 CP pistons and will be interested to see how yours turn out.

Darrin
Will JUN 20, 07:20 PM
I know Alan has pistons. His prices are competitive with what you can assemble from other aftermarket MFG's. I just wanted to do it my way. I'm going to be setting up .035 quench. When I get a heads/cams package, compression will go up to 12.5.
Nashco JUN 21, 12:56 PM

quote
Originally posted by Will:

The Ross pistons were heavier than I'd like. I didn't think about compression enough when I ordered the first set of CP's with deeper than stock valve reliefs. I ordered these with the same valve reliefs, but a net +3.5 cc dome. The grooves are cut for the diamond lapped TS rings that I bought. I'm going to have these coated ceramic tops & moly skirts.




So what are you doing with the old pistons? Didn't you pay to get the Ross pistons coated too? What did the CR work out to be with them? Also, have you posted what the actual weights were of your different pistons you've got around? Did you ever figure out the crank balance issue you were having way back?

I know it's a lot of questions, I'm a curious fella.

Bryce
Will JUN 21, 04:04 PM
Good thing you're not a cat.

I had the Ross pistons coated. They had standard ring grooves. I've already sold them. The first set of CP's has also been coated. Compression with them would have been in the low 10's. Stock is 10.5. I didn't think about it the way I should have, but I'm not going to all this trouble to build an all motor engine with less compression than stock. If I get a wild enough hair (hare?), I may build a 10:1 engine and put about 10 psi on it... Otherwise those pistons will sit on my shelf until someone wants them. Their utility is a bit limited because the grooves are cut for diamond lapped rings which are of course a little thinner than standard rings.

However... they may end up being just right for the Sealed Power rings which have very good thickness tolerancing for an OTS ring. I'll have to see what the groove width comes out to...
Nashco JUN 21, 05:07 PM

quote
Originally posted by Will:

Good thing you're not a cat.



Indeed! So, did you ever figure out where you went wrong on the balance? Have you kept your piston weights written down somewhere? I was hoping to have that documented in here somewhere for future reference. I don't know why, just seems like it may be useful to somebody someday, maybe even me. Thanks for the update.

Bryce
Will JUN 21, 10:22 PM
The crank that got F@#%ed up was the result of a miscommunication between myself and the shop and the balancer's lack of experience with that sort of work (lathe vice drill).

There isn't anything *wrong* with the current balance setup. I just need to figure out why my math isn't giving the same result as the measurement. The measurement is perfectly valid... but also on hold because the piston weight will change yet again.
toddshotrods JUL 09, 01:17 AM
Edit - found what I was looking for in WAWUZAT's thread

------------------
toddshotrods.com - wanna ride?
crazy projects, features, articles, art & more

[This message has been edited by toddshotrods (edited 07-09-2007).]