help with clearances
- Thread starter oscar22
- Start date
X2. Unless you want the engine to rattle & hammer like a diesel.
Go forged, or go home.
- Joined
- May 26, 2001
Like many engine parts, your best source for fitment and tolerance questions would best answered by a qualified authority, mainly the manufacturer.
An alternate source would be a shop, or person, who has actual experience, and success, with the given part.
Getting a proper answer to your question here will be difficult at best because very few turbo engines are built with hyper pistons.
An alternate source would be a shop, or person, who has actual experience, and success, with the given part.
Getting a proper answer to your question here will be difficult at best because very few turbo engines are built with hyper pistons.
You'll prolly be OK if you have no problem sticking to stock boost and timing levels. :redface: Just don't plan on turning up the wick and staying in one piece.
- Joined
- May 26, 2001
....Just don't plan on turning up the wick and staying in one piece.
I agree with that advise.
The hyper pistons were not built for turbo use, but for NA use. But since they fit in the turbo engine also, they have been used because of availability and cost.
Have not installed any in our engine builds, but have removed some. The ones we checked had a larger dish, which resulted in lower compression.
That is just another reason many will not use them.
I probably should expand on my original "comment".
Hyper pistons are used quite widely as an economic replacement piston, but it's been proven over the years that by their nature they are quite brittle.
While they likely will work for years in a normally aspirated engine with no trouble, and even in a boosted engine assuming it's not pushed hard AT ALL.
However, running them in a boosted engine is generally not recommended. Especially if that motor is going to see higher levels of boost. And those of us in the Turbo Buick community run pretty high boost levels even in street trim, let alone race trim.
So....In addition to my Boo Hiss comment, I would not recommend running them in a Turbo Regal.
Hyper pistons are used quite widely as an economic replacement piston, but it's been proven over the years that by their nature they are quite brittle.
While they likely will work for years in a normally aspirated engine with no trouble, and even in a boosted engine assuming it's not pushed hard AT ALL.
However, running them in a boosted engine is generally not recommended. Especially if that motor is going to see higher levels of boost. And those of us in the Turbo Buick community run pretty high boost levels even in street trim, let alone race trim.
So....In addition to my Boo Hiss comment, I would not recommend running them in a Turbo Regal.
BlackBandit
God loves Buicks!
- Joined
- Mar 29, 2003
I agree they aren't the best choice and if you can, go forged. Forged are better. Best choice would be forged. That said I'm running them. I haven't pushed them real hard (7.7x in the 1/8th on a 28" slick) on a light tune but I've pushed them harder than a stock tune. If I can get my car to run by friday (probably won't) I'll push it a little harder. FWIW I'm only looking for mid 7's in the eighth out of this motor. Now if I can ever find the funding to build another engine I'll definitely push this one as far as I can before I swap it out but that's a long way off. (family first) Bottom line is I've run hypers for quite a few years now with no problems. I don't detonate and I'm carefull. If you want a piston that will let you make a mistake these aren't them. If you're careful with them they'll run. How far I don't know and if you have dreams of running low 11's I would leave them alone. If you're in a bind and HAVE to get your car running well...........I'm running them.
Best choice though would be to run forged.
And because I know everyone wants to know I've had them to ~25-26 psi on stock heads/cam/turbo/intercooler(dutt neck) with alky. And ~20 psi on ported heads/bigger cam/te61/BGC SLI and alky.
but that's a long way off. (family first) Bottom line is I've run hypers for quite a few years now with no problems. I don't detonate and I'm carefull. If you want a piston that will let you make a mistake these aren't them. If you're careful with them they'll run. How far I don't know and if you have dreams of running low 11's I would leave them alone. If you're in a bind and HAVE to get your car running well...........I'm running them.Best choice though would be to run forged.
And because I know everyone wants to know I've had them to ~25-26 psi on stock heads/cam/turbo/intercooler(dutt neck) with alky. And ~20 psi on ported heads/bigger cam/te61/BGC SLI and alky.
as stated
your best bet would be forged .
but, your stocker OEM pistons were cast, not even Hypers! as they didn't
make hypers then, (87 and earlier)
here is a good read on hypereutectic pistons
Hypereutectic piston - Wikipedia, the free encyclopedia
your best bet would be forged .
but, your stocker OEM pistons were cast, not even Hypers! as they didn't
make hypers then, (87 and earlier)
here is a good read on hypereutectic pistons
Hypereutectic piston - Wikipedia, the free encyclopedia
