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Re: Vitara Pistons too sloppy? what about trying this?
Originally Posted by ej1 wilcox
So what's involved in the process? I've never heard of it before.
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Re: Vitara Pistons too sloppy? what about trying this?
Originally Posted by AbaZ
Throwing the pistons in a vise and squishing the pistons around
The pictures in my brother's book looks something like this. I'm sure machine shops have some special tool.... vice? http://www.timgilles.com/photogaller...rledpiston.jpg EDIT: Heres another pic i found of a Honda motorcycle piston. http://teamhansenhonda.com/parts/photo025.jpg |
Re: Vitara Pistons too sloppy? what about trying this?
nah, I dont know if thats how they do it.. I just always joked that they did it because the marks look so similar. ;)
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Re: Vitara Pistons too sloppy? what about trying this?
You put them in a lathe and use a knurling tool it has little rollers with various patterns that cut.That is def old school and used mainly in Cuba etc these days.
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Re: Vitara Pistons too sloppy? what about trying this?
how much slop is it. you can't build a motor by saying. eh that feels a little loose, you need to measure
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Re: Vitara Pistons too sloppy? what about trying this?
Originally Posted by fork
how much slop is it. you can't build a motor by saying. eh that feels a little loose, you need to measure
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Re: Vitara Pistons too sloppy? what about trying this?
Talked to my boss (automotive machinist) about this today. I asked about the process, and he was like, where'd you read that? That's OLD news. He said back about 40 years ago, people used to do it because leaded gasoline helped the cyl's wear away more quickly. Doing this allowed the owner to run the block with a quick hone and re-ring, instead of a bore/hone job costing a bit more money and time. This was typically done on pistons with a full 360* skirt, not today's style skirt design, although it's possible to do.
He was sort of shocked that people were still talking about this process, since he was around rebuilding motors when they realized it was really not a good thing. He told me that I should stay away from this. -josh- |
Re: Vitara Pistons too sloppy? what about trying this?
Originally Posted by AMkrew
Talked to my boss (automotive machinist) about this today. I asked about the process, and he was like, where'd you read that? That's OLD news. He said back about 40 years ago, people used to do it because leaded gasoline helped the cyl's wear away more quickly. Doing this allowed the owner to run the block with a quick hone and re-ring, instead of a bore/hone job costing a bit more money and time. This was typically done on pistons with a full 360* skirt, not today's style skirt design, although it's possible to do.
He was sort of shocked that people were still talking about this process, since he was around rebuilding motors when they realized it was really not a good thing. He told me that I should stay away from this. Ill agree seems way ghetto -josh- |
Re: Vitara Pistons too sloppy? what about trying this?
yeah, I can see doing this on simpler older motors that hot rodders and such used to but I just don't know if I would trust knurled pistons in a modern motor.
like 90dx said, knurling is done on a lathe. It doesn't really cut any of the metal away, it actually forms or presses it to fit the shape of the knurling tool, although you do get some small shavings that come off on the tool bit. It's fairly easy to do if you have a good lathe and knurling tool. http://www.technologystudent.com/images2/knurl3.gif That's basic knurling in a nutshell |
Re: Vitara Pistons too sloppy? what about trying this?
I did some knurling on some tools like a bearing puller i made etc and it is great for grip but i sure as ---- would not do it to a piston for a boosted motor.Knurling is def simple so if you wanted to try it the cost shouldnt be much it would probably be one hours labour say $50 roughly.
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