| [ Total Views: 1380 | Total Replies: 6 | Thread Id: 87986 ] |
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 speedster356
A.k.a.: Peter Mcleod
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| posted on January 6th, 2011 at 07:22 AM |
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Forged piston cylinder clearance?
JE forged piston 92mm / air cooled, what sort of cylinder clearance. This is on methanol and track only.
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on January 6th, 2011 at 07:35 AM |
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They should have a spec sheet with them, but i would like to see min .005".
Boost? probably up to .010"
| Quote: | Originally
posted by westi
That's mad Alan.
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speedster356
A.k.a.: Peter Mcleod
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Plastic not Classic Racing
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| posted on January 6th, 2011 at 07:49 AM |
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No boost Dave. Thanks for that.
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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Beetspeed
A.k.a.: Walter
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| posted on January 7th, 2011 at 11:09 PM |
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| Quote: | Originally
posted by dangerous
They should have a spec sheet with them, but i would like to see min .005".
Boost? probably up to .010"
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Wouldn't you need to know first what type of forged JE it is? Excessive clearence (if its not needed, not saying it isn;t) would only give extra
piston slap.
AFAIK, there are 2 kinds (material used), each with its specific expansion/clearence rate per mm or inch bore.
The manufactors (JE) info about those rates are on their website including the ring gaps, so no guessing needed.
'75 1303 'Renner' 2.2 T4 turbo
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on January 8th, 2011 at 07:05 AM |
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Yes.
| Quote: | Originally
posted by westi
That's mad Alan.
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 vw54
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| posted on January 8th, 2011 at 07:46 AM |
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send us a link to the site and clearences
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on January 8th, 2011 at 08:56 AM |
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Please.
Here are the specs required for the two different materials.
You can use the JE pistons website to work out what you have,
but as mentioned in my first response, it should all be in the specs sheet that comes in the box.
http://www.jepistons.com/PDFs/TechCorner/SCPDrawings/piston_instrc2618.pdf
http://www.jepistons.com/PDFs/TechCorner/SCPDrawings/piston_instrc4032.pdf
I always run a little more clearance with air cooled, or with boost as stated in the instructions.
But in a perfect world it should be fine with the recommended clearance they list.
The extra clearance can make it harder for the rings to do their job,
but a clearance that is too tight can be catastrophic(sp?).
| Quote: | Originally
posted by westi
That's mad Alan.
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