boardkid280z Posted April 23, 2007 Share Posted April 23, 2007 Anyone have any opinions or experiences with this set of 89mm dished pistons made to overbore the L28 Turbo from 86mm to 89mm. I thought about finding some 87-88mm forged dished pistons to overbore my block for my supercharged project, but if these are good enough I might do this instead. He claims that this set of cast pistons is just as good as or better than forged for street apps. "Forged pistons require large clearances with the cylinders since they expand far more than cast pistons when they get hot. If your engine doesn’t stay at race temps then this is bad. Large piston clearance at street temps is noisy, causes blowby, serious ring wear, and massive oil consumption leading to fouled plugs and thick carbon deposits on the pistons, combustion chambers and exhaust valves and ports. 10k miles of this and your new engine will need rebuilding. Dad says please trust him on this, there’s a reason why Porsche and Ferrari don’t use forged pistons in their street engines and it isn’t just to save cost." http://cgi.ebay.com/ebaymotors/Datsun-Nissan-280Z-280ZX-L28-3-0-Turbo-Piston-Kit_W0QQcmdZViewItemQQcategoryZ140692QQihZ001QQitemZ110117210328QQrdZ1QQsspagenameZWDVW Quote Link to comment Share on other sites More sharing options...
TimZ Posted April 23, 2007 Share Posted April 23, 2007 What are your power goals? For under ~300-350hp, cast should work fine. If you want more than that, forged will be far more tolerant of tuning mistakes. Quote Link to comment Share on other sites More sharing options...
boardkid280z Posted April 23, 2007 Author Share Posted April 23, 2007 Well 300 is the minimum I am shooting for. I know people say to pick a "hp" goal and shoot for it, but I'll just be wanting more when I reach a goal, so whatever I can afford is what I'm shooting for. And if I can get 350hp out of 200$ pistons instead of having to pay $600 for forged pistons for 400hp+ I might just go with the cheap pistons for now. Addendum: Should I get them ceramic coated or whatever? Quote Link to comment Share on other sites More sharing options...
TimZ Posted April 23, 2007 Share Posted April 23, 2007 And if I can get 350hp out of 200$ pistons instead of having to pay $600 for forged pistons for 400hp+ I might just go with the cheap pistons for now.Addendum: Should I get them ceramic coated or whatever? Problem is that with the amount of overbore the 89mm pistons require, you won't have any additional room left - if there is any cylinder wall damage form breaking the cast pistons you'll be replacing the whole motor. BTW, 350hp is assuming that you have a standalone EFI and real tuning experience. If you are a newbie, I'd move those limits down to 250-300hp. Quote Link to comment Share on other sites More sharing options...
boardkid280z Posted April 23, 2007 Author Share Posted April 23, 2007 Yea, I've been running Megasquirt for a year now and feel totally comfortable with the tuning part. Everything that needs to be upgraded is going to be upgraded. I'm just on a tight budget here. Quote Link to comment Share on other sites More sharing options...
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