Any drawbacks to using forged pistons?
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Any drawbacks to using forged pistons?
If you were going to rebuild an LS6 and didn't plan any power adders such as nitrous, big cam etc., would it be better to go with the hyperutectic type pistons or go forged? Are forged pistons noisier after they warm up than the hypers?
#2
All OEM LS1/LS6 engines including mine are noisy at cold start up. What causes this noise I do not know. I bet forged pistons would be just as noisy or even noisier. Coating them may help.
My friends 1999 GMC Full size pickup truck knocks very loudly until fully warmed up.
My friends 1999 GMC Full size pickup truck knocks very loudly until fully warmed up.
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Originally Posted by gollum
All OEM LS1/LS6 engines including mine are noisy at cold start up. What causes this noise I do not know. I bet forged pistons would be just as noisy or even noisier. Coating them may help.
My friends 1999 GMC Full size pickup truck knocks very loudly until fully warmed up.
My friends 1999 GMC Full size pickup truck knocks very loudly until fully warmed up.
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#11
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Originally Posted by jub jub
Forged it is.
Will there be any HP loss over cast pistons?
Will there be any HP loss over cast pistons?
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If you guys wanted to buy a used Z06, would you want it with a stock (virgin) engine or a forged block built by a reputable tuner (I think I know what the answer will be with this crowd ) ?
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Originally Posted by jub jub
If you guys wanted to buy a used Z06, would you want it with a stock (virgin) engine or a forged block built by a reputable tuner (I think I know what the answer will be with this crowd ) ?
Dan
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Originally Posted by SLPSS99
A forged block by a reputable builder, but I love the bottle and would prefer a nice forged shortblock for a big shot of giggle juice!!
Dan
Dan
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Originally Posted by jub jub
If you guys wanted to buy a used Z06, would you want it with a stock (virgin) engine or a forged block built by a reputable tuner (I think I know what the answer will be with this crowd ) ?
well Id answer as youd expect. but later down the road, if you were to sell the vette, Id think MOST potential buyers would frown on an aftermarket engine. Id be willing to guess the typical vette owner would not want the car modded in any way. and in there eyes, it would be worth less then with the orig. engine. know what I mean?
and yes, forged pistons will make more noise when cold due to thermal expansion. basically the forged pistons will grow as they heat up and not rock back and forth like they will when cold.
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I hate hypereutectic pistons so the answer for me is simple. Most forged pistons these day do not require nearly as much clearance as those of yesteryear. In fact the cheapo forged Sealed Powers for the gen 1 350's require the same min clearance as a stock replacement (.0015). Granted most shops frown on that and set them up a little looser. The main advantage to a hyp pistons is that they do not absorb heat as easily as a forged, but that can be corrected with a ceramic coated forged. Hyp pistons are quite brittle (at least they used to be when I was in the business) and were very prone to breaking when exposed to even mild detonation.