383 240z Posted June 6, 2002 Share Posted June 6, 2002 I was tearing down a good 327 just to check a few things (bearings rings mike the bores etc) long story short I dropped the #3 piston and broke the skirt. Can I replace just one or should I buy a new set? the bores are good just going to run new rings. The pistons are aftermarket flat tops. If I need new at what point do I need forged? will cast last or should I split the difference and go hyperutectic? the car will be a 2nd gen rx-7 mid power (300 hp) automatic w/4:10 rears carbed daily driven a curb weight of about 3000 lbs Thanks Keith Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 6, 2002 Share Posted June 6, 2002 IMHO cast would be ok to 300 HP and maybe much more, as long as you don't get it pre-igniting due to, to much spark advance (or cheap octane gas), lean mixture and or cooling problems. Regards, Lone Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 6, 2002 Share Posted June 6, 2002 Buy a new piston. Quote Link to comment Share on other sites More sharing options...
383 240z Posted June 7, 2002 Author Share Posted June 7, 2002 OK so one piston should do me but how important is an EXCACT match or will REAL close be good enough? I was planning on driving out to Summit Racing and having them match me up one. the 7 that I did not break are forged so I'll get one of those I was not sure about running a mixed set I'm guessing I'll need to have this re-balanced? Keith Quote Link to comment Share on other sites More sharing options...
pparaska Posted June 7, 2002 Share Posted June 7, 2002 If you have or can get the use of a 0.0001" graduated dial bore gage, measure the cylinder it goes in. Then go to Summit with a 0.0001" graduated 4-5" micrometer and measure a few pistons to find one (of the same brand and part number) that has a diameter that will yeild an acceptable piston to bore clearance. Summit should be able to provide that info from the manufacturers catalog. Once you have that piston, just have it balanced to within a 5 or so grams of another piston from your set and you'll be fine. Quote Link to comment Share on other sites More sharing options...
383 240z Posted June 8, 2002 Author Share Posted June 8, 2002 That would be easy if I knew what pistons were in the motor I'm cleaning them up now looking for a brand or part number I've been looking at PAW's parts book and a new set of pistons might not be out of my pocket I'll see what I find out when this piston comes out of the claening tank. Keith Quote Link to comment Share on other sites More sharing options...
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