Piston to wall clearance
12-24-2008, 04:05 PM
#41
I need some a little clear. How can I tell machine shop I want bored from my 5.3 iron block to 5.7 which make 346 cubic. Piston would be 3.898 How can I tell them a size to bore? Like .119 If I mistake? Tell me a number right so I easy to tell the guy about size to bore to see how much it will cost me.
You don't have to tell them the actual size it need to be, they are machinist and will know what the tolerances should be. The piston MFG will include in the box the fit tolerances they recommend for their pistons.
12-24-2008, 07:42 PM
#42
Just take them the pistons and the block and tell them the block needs to be bored for those pistons and they will know what size the bore actually needs to be for those pistons.
You don't have to tell them the actual size it need to be, they are machinist and will know what the tolerances should be. The piston MFG will include in the box the fit tolerances they recommend for their pistons.
You don't have to tell them the actual size it need to be, they are machinist and will know what the tolerances should be. The piston MFG will include in the box the fit tolerances they recommend for their pistons.
12-26-2008, 01:06 PM
#45
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The last set up I had built has .001 piston to wall clearance with off the shelf mahle's. 3.905 pistons in a 3.904 bore. the pistons measured 3.903 at the skirt and 3.902 at the rings. The .003 clearance they want is already built into the top of the piston. If you go over .002 on the skirt the truck will sound like a diesel. I learned this after building my own with .003 clearance and then I bought a Lingenfelter short block and those pistone were noisier. After 7k on their motor the piston walls were scored and the pistons themselves were galled. Mahle runs the same type pistons in the new ZO6 at -.001 to .001 clearance at the skirt. The piston top expands not the skirt. The only thing needed to prevent damage is the proper ring gap for boost, nitrous, or both. Good luck with you build. This is my experiece with piston to wall clearance and I would hate to see some one waste the money I did to find the right combo.
12-26-2008, 03:58 PM
#46
Mahle is saying the biggest they want the bore to be is a 3.908 for a 3.905 piston. This guy said he measured the bore with 2 different tools and got 3.910 on the money.
I think what I may have to do is go with maybe one of these?
http://www.texas-speed.com/shop/item...d=120&catid=38
I think what I may have to do is go with maybe one of these?
http://www.texas-speed.com/shop/item...d=120&catid=38
I may need a set for the 5.3l to 5.7l build I want to get rolling on, I have 317 heads though so not sure of they will work with the pistons you bought already.
Damm dude, I would be so pissed if someone overbored my block even if its only .002"
A machinist of any caliber should have been able to hit the right numbers, I mean **** he had eight freakin tries!!
I guess from reading all the replies it was a total miscommunication issue, not the fast that he did anything wrong??
Last edited by TG02Z71; 12-26-2008 at 04:39 PM.
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