bsr65
High Number
Posts: 114
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Post by bsr65 on Jul 9, 2014 15:25:37 GMT
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Post by henri on Jul 9, 2014 19:12:51 GMT
havent used 1 ,but have heard ok-ish things about em ,what engine/tune are you thinking of using it on , as its a bit overkill for a road scoot really . the 1's ive seen used where on tuned/race scoots that where regulary blown up or stripped in case they might or for further work,thats why i said ok-ish ,dont know how long they will last in road use .but havent heard any reports of a bigger tendency to nip up/seize in use ,but as they were on tuned scoots jetting was closely monitored an the usual blame for any bangs . Henri
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bsr65
High Number
Posts: 114
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Post by bsr65 on Jul 9, 2014 19:57:28 GMT
cheers for reply, my mk1 p200e needed a rebore, and a mate gave me one of these pistons (oversize 1) for some work I did for him. think Ill give it a try.
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Post by sbwnik on Jul 9, 2014 22:33:03 GMT
I've got one sat on the shelf in the garage, it came in its original box.
Strictly speaking, it's not a P2 piston, it's one for the alloy barrel that they used on some Cosa 200s. There isn't any more power to be had, and I'm told that in a steel cylinder the rings wear more quickly.
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Post by henri on Jul 10, 2014 8:02:41 GMT
logically smaller area with same forces would mean faster wear rate ,as youve got 1 for free ya might aswell use it,but dont know how long the rings will last , or flea-bay it an with cash raised get a stock 1 with known wear rates/propertys .h
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Post by pxguru on Jul 10, 2014 11:26:37 GMT
Henri, I beg to differ. Ring area is smaller but the force is smaller by a similar amount. Spring force of the ring is not as strong on a thin steel ring and the ignition blast pressure force is directly proportional to surface area inside the ring. That aside you only really need one of these pistons if you work your engine hard most of the time or have ported it to rev higher. In reality the fat rings wear rapidly with high rpm and the thin rings don't as much. The thin ring piston can handle a very much wider exhaust port too. I have used the thin ring 68mm piston in standard barrels with great success  |
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