 Champher piston skirts, useful on a 4 stroke? |
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| I_like_2_weld |
 Jun 27 2012, 03:56 PM
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#1
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Newbie  Group: Members Posts: 10 Joined: 18-May 12 From: Florence Kentucky Member No.: 14,448 Region Association: None  |
When I used to road race old 2 strokes we would round out and smooth all edges & transitions on the piston skirt, even the hole for the piston pin. I realize a 4 stroke piston & rings are a tighter fit in the bore than a 2 stroke, so maybe this is not needed, since less chance of piston rock? The new AA pistons I have just seem to have sharp edges on all the skirts & was just curious if anyone dresses them before installation.
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| I_like_2_weld |
Jun 27 2012, 04:02 PM
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#2
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Newbie Group: Members Posts: 10 Joined: 18-May 12 From: Florence Kentucky Member No.: 14,448 Region Association: None |
Sorry..Chamfer....should have checked how to spell it.
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| wildman |
Jun 27 2012, 04:39 PM
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#3
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Newbie Group: Members Posts: 34 Joined: 24-May 11 From: Oklahoma City, OK Member No.: 13,112 Region Association: Southwest Region |
I dont know about the pros or cons of chamfering itself but most piston sets are very closely balanced and any removal would need to be exactly the same for all 4 pistons
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| ldsgeek |
Jun 27 2012, 05:40 PM
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#4
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Member Group: Members Posts: 155 Joined: 27-June 10 From: New Hampshire Member No.: 11,885 Region Association: None |
Also, on s 2 stroke the piston is part of the induction system, covering and uncovering the transfer ports and exhaust ports. Chamfering may improve airflow if done properly, not an issue with a 4 stroke.
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