Bad 103" pistons
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Cruiser
Joined: Aug 2008
Posts: 111
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From: NZ
Bad 103" pistons
Guy I know just installed a set of cast SE103' pistons,was just running the engine in and one of the pistons has blown,looks like it went around the gudgeon pin.
No other apparent problems,no scoring on the bore, c/c is black, no signs of overheating.
Have heard that this is not totally unknown to happen,has anyone else heard of the cast pistons grenading?
No other apparent problems,no scoring on the bore, c/c is black, no signs of overheating.
Have heard that this is not totally unknown to happen,has anyone else heard of the cast pistons grenading?
Banned
Joined: Sep 2009
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From: deland,florida
we use & sell alot of 103" SE cast pistons,never had a prob.but anything can have a defect.youde have to REALLY doing something your not supost to be doing,(very high comp.,reving way too much or spraying it) to explode a cast piston(seen KB pistons do it though)
kirby
vee twin racing
kirby
vee twin racing
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Joined: Sep 2009
Posts: 3,569
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From: deland,florida
with a mild build,there no reason to use forged pistons,hi compresion,going to be standing on it,by all means forged.but i get guys call all the time wanting just a build for more power over stock,not ***** to the wall,and say should they use forged or cast,i ask why and they cant give a reason,besides they read it some place.cast pistons can be set up alot tighter,better ring life & no piston slap(besides this,ive never heard of one breaking)
kirby
vee twin racing
kirby
vee twin racing
Former Sponsor
Joined: Apr 2007
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From: Davie, FL
I have just had a forged piston in my 113 ci Evo TP motor break off the end and go up the valve from the back into the front. No problems for 4.500 miles and than this on I-95 @ 70 mph. Figure it was some bad gas. Do not know yet.
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