Piston To Cylinder Wall Clearance - Snowmobile World : Your #1 Snowmobile Forum
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post #1 of 30 (permalink) Old 09-02-2003, 10:59 PM Thread Starter
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What is the recommended clearance/tolerance between the piston and cylinder. Getting ready to do the top end, and debating whether or not to replace the pistons or just put new rings in. Thanks, Butch.

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post #2 of 30 (permalink) Old 09-02-2003, 11:31 PM
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what sled?








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post #3 of 30 (permalink) Old 09-02-2003, 11:57 PM
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Brad,
it is usually based on that of bore size. The bigger the bore, the more clearance needed for expansion. About .009-.010 is about max on your sled (800 Twin Rotax) but most end up .012 or more.
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post #4 of 30 (permalink) Old 09-03-2003, 08:38 AM
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I have almost .009 on my 800 cylinders with Elko pistons. I have decided to go the wiseco route with coatings. I will now have .006. The high limit in the service book is .0057 for the Elko's.
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post #5 of 30 (permalink) Old 09-03-2003, 09:23 AM Thread Starter
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Quote:
Originally posted by 377safari@Sep 2 2003, 09:31 PM
what sled?








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Has anyone had their pistons coated by any of the various high temp. coaters out there (swain tech., fireball, etc.)? Can they do used (but not abused) pistons or do they need to be new. Just wondering what options are out there and what those with experience would recommend. Thanks again, Butch.

Now off to measure I go.

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post #6 of 30 (permalink) Old 09-03-2003, 09:23 AM
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Wiseco recomends .0085 Pete. I would not run anything less. Mine is setup for .0092.
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post #7 of 30 (permalink) Old 09-03-2003, 09:43 AM
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Dave,

The sticker on the piston kit I have from wiseco says clearance .0051. I am going to .0061.

Do you have a different kit than I do???
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post #8 of 30 (permalink) Old 09-03-2003, 10:06 AM
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Also how did obtain .0092 clearance?? The wisecos I have are bigger than the elko's. without coating there on the tight side. about .0045. Did you have the NIC honed???

My elko's were about 3.2202. The wisecos are 3.2231. is there that much difference from one wiseco kit to another???
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post #9 of 30 (permalink) Old 09-03-2003, 11:18 AM Thread Starter
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Dave, did you notice any problems with lean conditions, like those mentioned in the tech section. I believe it is talked about on the idooski project sled. The part about the sides of the pistons being cut out vs. the stock pistons having a solid area around wrist pin. Is this something to be concerned about?

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post #10 of 30 (permalink) Old 09-03-2003, 02:35 PM
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Butch... I believe you would be just fine with the Wiseco's. They don't have the recess around the pin. I believe that the recess is a real concern. I hear that a lot of people are having good luck with the ART pistons, but there are several that are having trouble. It has nothing to do with ART. It's just the recess in that particular piston.
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