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-   -   Vitara Pistons too sloppy? what about trying this? (https://www.homemadeturbo.com/general-discussion-6/vitara-pistons-too-sloppy-what-about-trying-74619/)

evosol 03-01-2007 12:12 AM

Vitara Pistons too sloppy? what about trying this?
 
Hey,
My little brother is going to school and getting his ASE certificate, but he came home today and told me about a process that some hotrodders use on their pistons to take up a little piston wall clearance. The process involves lightly knurling a small portion on the face of the piston skirt (exhaust/intake). He was told that pretty much any machine shop can do this.

I also read a little bit about it in his engine rebuilding book. I think this might be an alternative to taking up a little "slack" in the Vitara pistons. If i ever have to rebuild my current motor i'm gonna try this out.

EDIT: according to some research, knurling can increase the piston diameter by a "few thousands," which would be perfect on some vitaras.

Sure, there are those who are totally against this technique and there are those who say that there are increased benefits of oil retention and slight cooling.

Just a thought... discuss away...

HMTguy 03-01-2007 12:17 AM

Re: Vitara Pistons too sloppy? what about trying this?
 

In the days when labor was cheap and parts expensive, this repair method was feasible on pistons of internal combustion engines, where the skirt of a worn piston was expanded back to the nominal size using a knurling process. As auto parts have become less expensive, knurling has become less prevalent than it once was, and is specifically recommended against by performance engine builders
Old hotrodders indeed.

Still, if you can do it why not?

evosol 03-01-2007 12:23 AM

Re: Vitara Pistons too sloppy? what about trying this?
 
I guess another question would be how much it would cost to get the process done.

Cray91 03-01-2007 12:54 AM

Re: Vitara Pistons too sloppy? what about trying this?
 

Originally Posted by evosol
I guess another question would be how much it would cost to get the process done.

If you are rockn' Vitaras you are cheap, and labor isn't. So I can't see that we are moving in the right direction here. They are proven to make power and be reliable, so this seems to be a moot point.

HMT-Admin 03-01-2007 02:31 AM

Re: Vitara Pistons too sloppy? what about trying this?
 
I had a machine shop knurl a set of srp's along time ago, i think it was like 20 dollars.. definatly some backyard ----.

TunerToys 03-01-2007 02:34 PM

Re: Vitara Pistons too sloppy? what about trying this?
 
Have you actually checked the p2w clearance on your pistons and cylinders? We are running a set of stock bore Vitaras in one of Bambi's old A6 blocks, and they were just fine, no slap, no knock, sounds normal.

Just make sure you don't spend more trying to make somthing work, than you would have spent on a sure thing.

Craig


evosol 03-01-2007 04:27 PM

Re: Vitara Pistons too sloppy? what about trying this?
 
I know my current build has a little slop, a little noisy when cold, but i just thought it would be an idea for those who are concerned with the piston/wall gap.

99 Si 03-01-2007 04:30 PM

Re: Vitara Pistons too sloppy? what about trying this?
 
this brings up a problem that i have with my build. the machine shop measured the block that im using and said that std bore pistons will work but that its going to be on the loose side. would this help out ?

BRIOHATCH 03-01-2007 04:38 PM

Re: Vitara Pistons too sloppy? what about trying this?
 
i would say try that ----...i dont see it hurting anything really...and if you have a significant amount of slop your probably fucked anyway...might as well try it for like 20 bucks if thats what the price is

koreanwilcox 03-01-2007 05:52 PM

Re: Vitara Pistons too sloppy? what about trying this?
 
So what's involved in the process? I've never heard of it before.


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