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#1
07-24-2006, 10:53 PM
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pistons
has anyone ever heard of cone headed pistons and where they could be found, and whats a good number to bore my engine to, ( examp 30 over 20 over...) :feedback
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1991 Talon Tsi automatic, new engine, 16g small turbo, tubuler manifold, pacesetter cat back exhaust, polyuarthen moter mounts, high prof fuel pump, opened up K&N air filter intake 
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#2
07-25-2006, 02:09 AM
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Re: pistons
Cone headed? to increase the compression? You don't want super high compression because you will get detonation unless you have alcohol/h20 injection.
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95 GSX:FMIC, 6-bolt, evo 3 16g, 2600 act clutch, 1g bov (crushed), and a 3" turbo back exhaust, dsmlink, dks 272 cams, wideband 02, Coming soon 2.3L Stroker, 1mm oversized valves, crower sprigs. 91 TSI AWD auto, gm 3.5 maf, maft, fmic, emanage, profec e-01, 3" turbo bk exhaust +more little stuff. http://www.ratemydsm.com/member/ez1286/?member=ez1286  
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#3
07-25-2006, 02:29 AM
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Re: pistons
Never heard of "coneheads", but I think you looking for "pop-top" pistons(as some people call them).
Bore your cylinders in .0010" increments until all the scratches are removed. This is better left done by a machine shop..
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2007 Certified DaimlerChrysler Service Technician... True blue GM at heart.
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#4
07-25-2006, 02:47 AM
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Re: pistons
I think hes talking about dome topped pistons and no, you dont want them. Just get some bastards with like 8.5:1 compression and you'll be good to go. I wouldnt go out by .001" at a time, I would just have them take it out .020 first, see if that fixed any of the problems. If not, got to .030 over. Then .040 if needed, other than that I dont think you can have them taken out any farther. Remember, there will probably be more problems than scratches like out-of-round so merely getting the scratches out may not and probably wont get all the problems fixed. Also, I know you could probably not be exactly .020" or .030" over or whatever and still make it work, but pistons only come in .020 over, .030 over, and .040 over so having a bore of +.035 wouldnt do you much good
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 Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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