Vitara Pistons too sloppy? what about trying this?
03-01-2007, 12:12 AM
#1
1.5 BAR
Thread Starter
Join Date: Jul 2003
Posts: 890
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...
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...
03-01-2007, 12:17 AM
#2
Guest
Posts: n/a
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
Still, if you can do it why not?
03-01-2007, 12:54 AM
#4
3.0 BAR
Join Date: May 2004
Posts: 5,042
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.
03-01-2007, 02:34 PM
#6
Guest
Join Date: Dec 2002
Posts: 1,463
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
Just make sure you don't spend more trying to make somthing work, than you would have spent on a sure thing.
Craig
03-01-2007, 04:27 PM
#7
1.5 BAR
Thread Starter
Join Date: Jul 2003
Posts: 890
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.
03-01-2007, 04:30 PM
#8
0.5 BAR
Join Date: Jun 2006
Posts: 65
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 ?
03-01-2007, 04:38 PM
#9
1.0 BAR
Join Date: Nov 2005
Posts: 551
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
