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Home > Help Needed / General Tech Chat > piston/bore clearance

mark4765

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29th Jun, 2004 at 11:59:04am

does anyone know what the ideal piston to bore clearance would be using omega cast pistons and turbo block at +20 ???

regards mark

Edited by mark4765 on 29th Jun, 2004.


AlexF2003

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AFRacing LTD

Newbury, Berks

29th Jun, 2004 at 12:31:18pm

Ring Omega and ask :)

alex

AlexF

iain
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Sold the turbo and seeing what the C20XE can do!

Near Lincoln

29th Jun, 2004 at 12:54:09pm

Thought this figure came as a spec with the pistons. Its all down to the thermal expansions at a guess. Omega is the place to ask *smiley*

AlexF2003

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AFRacing LTD

Newbury, Berks

29th Jun, 2004 at 01:34:20pm

Yeah it should do, but some manufactures assume...

Giving them a ring is the best way, nothing like info from the horses mouth!

Alex

AlexF

mark4765

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29th Jun, 2004 at 01:40:47pm

cant get through!

mark4765

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213 Posts
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29th Jun, 2004 at 03:57:38pm

got through in the end...they recommend between 2 and 2 1/2 thou

Skinns46

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Cambridge

29th Jun, 2004 at 09:58:36pm

Apparently for every inch in diameter for the piston you've got to give 1 thou clearance. (2.5 inch piston diameter : 2 1/2 thou clearance).
I could be wrong. And the top of the piston is going to have more clearance than the skirt.

Edited by Skinns46 on 30th Jun, 2004.

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turbodave16v
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SouthPark, Colorado

30th Jun, 2004 at 09:44:43am

The top must have a greater clearance you mean surely?

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evolotion

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Glasgow, Scotland

30th Jun, 2004 at 04:49:20pm

iv deleted al my old mails, but for my forged pistons the clerances were greater, best to jsut fone and askrather than assume.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

24th Feb, 2010 at 05:35:53pm

All the Megas I've measured have been 71.06 in .020. I have my blocks bored 71.12 That's 0.06mm clearance.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

Brett

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Doncaster, South Yorkshire

24th Feb, 2010 at 06:25:04pm

cheers Vegard
so your pistons was 2.7976inch
and your block was bored to 2.8000inch
giving 0.0024inch clearance 2.4 thou?

isnt 6 years a record for you too ? *tongue*

Yes i moved to the darkside *happy*

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