piston clearance?

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piston clearance?

Post  james00 on April 12th 2016, 9:00 pm

is 8 thousths too much piston to wall clearance on a 460

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Re: piston clearance?

Post  Carl on April 13th 2016, 11:13 am

Depends on what the piston is made of, and how it will be used.


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Re: piston clearance?

Post  paperman on April 13th 2016, 4:15 pm

Seems awfall big. Whats the application, bore and piston MFG?

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Re: piston clearance?

Post  gt350hr on April 13th 2016, 4:18 pm

The manufacturer is most important. That determines where it is measured and what it should measure.

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Re: piston clearance?

Post  IDT-572 on April 13th 2016, 4:52 pm

Is it where it should be? No, but will it work and be noisy, yes.

I have ran them that loose and more, with a file fit ring to get a good ring seal.

The bore being round is of more concern to me, if it's worn that much and not a screwed up boring job.

Just up to you, on how good of a rebuild you want or need. Probably ain't going to be a 100,000 mile engine.

Hey , just my two cent's worth............... Wink Wink
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Re: piston clearance?

Post  Paul Kane on April 13th 2016, 9:03 pm

james00 wrote:is 8 thousths too much piston to wall clearance on a 460
What application, kind of piston material, and exactly where are you taking your measurement?
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Re: piston clearance?

Post  james00 on April 14th 2016, 5:38 am

Paul Kane wrote:
james00 wrote:is 8 thousths too much piston to wall clearance on a 460
What application, kind of piston material, and exactly where are you taking your measurement?
they are trw forged pistons. i am taking measurements about an inch from the bottom of the skirt.this is just a street engine the pistons have been milled to flat tops. 5 of them have 5 thousands clearance and 3 of them are 8 thousands thanks

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Re: piston clearance?

Post  gt350hr on April 14th 2016, 11:26 am

james00,

If you are going to use them . Put the smallest pistons in #1 and 5 cylinders and the third "small one" in #2. Because of water flow in and out of the block this will be the best location for them. Paul is right , they are loose , but they are not loose enough to cause failure of the piston itself.

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Re: piston clearance?

Post  Paul Kane on April 14th 2016, 12:16 pm

james00 wrote:
they are trw forged pistons. i am taking measurements about an inch from the bottom of the skirt.this is just a street engine the pistons have been milled to flat tops. 5 of them have 5 thousands clearance and 3 of them are 8 thousands thanks
In addition to the latest post above and to be prudent, I suggest you first remeasure a cylinder bore(s), and also that you very carefully and consistency measure your piston skirts again and in the exact same location on each piston. You might have 5 good pistons (0.005") and 3 pistons (0.008") with collapsed skirts. This assumes you are measuring used pistons. If they are new then you may disregard this post...but try to take more precise measurements.
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