Hypereutechtic or Forged??
Thread Starter
Racer
Joined: Apr 2003
Posts: 286
Likes: 2
From: Suffolk VA
Hypereutechtic or Forged??
So I am on my way to stroking out my LT1 to a 396cid beast..the bottom end I have decided should be bullet proof... In the past I have always gone with forged pistons to ensure that, however I have heard that these "Hypereutechtic alloy" pistons are quite the shizzznaddd. :smash:
I have heard they are lighter, and have less expansion due to the added silica than forged, but are comprable in strength?...:confused: So what's the deal? Are they really the Cats Meow or just hype? I like the idea of no cold "knock" like forged pistons under go due to their large expansion properties. Hypereutechtic Alloy sounds like cold start wear is greatly reduced.....so what do you all think? :cheers:
I have heard they are lighter, and have less expansion due to the added silica than forged, but are comprable in strength?...:confused: So what's the deal? Are they really the Cats Meow or just hype? I like the idea of no cold "knock" like forged pistons under go due to their large expansion properties. Hypereutechtic Alloy sounds like cold start wear is greatly reduced.....so what do you all think? :cheers:
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
Re: Hypereutechtic or Forged?? (KyRP2NITe Corvette)
They are stronger than a normal casting, but with the added silica, they are more "brittle." They won't take the repeated abuse a good forging will.
If your most concerned with the noise, why not try a high-silica forging. SRP makes a good piston that has minimal expansion.
Good Luck! :cheers:
If your most concerned with the noise, why not try a high-silica forging. SRP makes a good piston that has minimal expansion.
Good Luck! :cheers:
Safety Car
Joined: Mar 2002
Posts: 3,780
Likes: 442
From: Southwest MI
Re: Hypereutechtic or Forged?? (VETDRMS)
........why not try a high-silica forging. SRP makes a good piston that has minimal expansion.
i'd go with those (but still fit them about .0045 for Super HD use)
Burning Brakes
Joined: Nov 2001
Posts: 1,189
Likes: 2
From: Austin TX
Re: Hypereutechtic or Forged?? (KyRP2NITe Corvette)
I've generally built street engines using TRW forged
pistons because they have some silicon content to control expansion
and reduce scuffing, thus can run reasonable clearances (.004" to .005")
I've used Arias or Venolia pistons in race engines, but they require
alot more clearance and do rattle (although you can't hear it with
open headers).
For my most recent engine (personal Vette engine) I tried my first set
of hyper pistons (KB) and am running .0015" clearance. I've got about
6000 miles on them, 100 passes down the drag strip, turned them as
high as 7500rpm, and they don't make noise. No problems so far.
I decided to go with them because KB made a lightweight piston
that fit my application and with spirolox for full floating pins.
Dan
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Re: Hypereutechtic or Forged?? (KyRP2NITe Corvette)
The new hyper euthectic pistons are extremely strong, alot strong then forged but they are not forgiving. While forged is ductile and will bend it abused the hyper euthectic pistons are strong right up to the point of breaking. They will handle nitrous and blowers and for the dollar are great. They control oil better then forged but forged on the big block can be installed as tight as .0045 for better cold starting and oil control.
I have a set of hyper pistons in one of my nitrous cars and have no fear of breaking them.
I have a set of hyper pistons in one of my nitrous cars and have no fear of breaking them.
Thread Starter
Racer
Joined: Apr 2003
Posts: 286
Likes: 2
From: Suffolk VA
Re: Hypereutechtic or Forged?? (norvalwilhelm)
Well, sound ilke there is more of a strong following out there than I realized for these Hypereutechtic pistons :eek: I have found a set of Hypereutechtic for my 396 stroker set up made by Keith Black (1.061" compressoin height) with all this great feed back I think I'll have to give these a go this time :cheers: I'll let you guys know how it turns out when I get everything in and put together. :thumbs:
Safety Car
Joined: Aug 2000
Posts: 3,909
Likes: 26
From: Clymer PA
Re: Hypereutechtic or Forged?? (KyRP2NITe Corvette)
Personally I'm not a fan of hypereutectics for the upper end performance level especially whenever higher compression ratios are taken into account. I was going to go with a set of hypereutectics for my motor (12.5:1) due to cost. A friend changed my mind and I now have a set of TRW forged 12.5:1 pistons. Hypereutectic pistons don't like detonation and fracture relatively easily. When compared to a cast piston they are much better....but they are still a casting. Forged pistons are more ductile and will handle stress much better. Hypereutectics are good for a little 400 horsepower small block job, but for some reason I think your goal with the 396 small block will be more than 400 horsepower. There is a much smaller margin of error when dealing with Hypereutectic pistons.
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Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Hypereutechtic or Forged?? (bence13_33)
3.875 and Hypereutechtic is questionable in a roller motor. they have a FPM limit.
If you have a motor that you plan to run to say 6200 with a H-roller with high temps they just can't do it. I had KB's with a 355 ci and they pistons vurtually melted. They became mush would be the best description. The pistons skirts smeared and filled the ring lands wedging the rings into what sounded like bad rod knock. Upon tear down I had smeared aluminum on the bores and the pistons were oval.
It was a severe test :smash: I was testing on a well broke in motor for one of the Nevada open road races. Before that i had them doing well over 7000 rpm at drags races for many 1/4's Sustained high rpm something like 20 minutes and they were gone. If you would like a picture I can go take one. :) it's in my failed parts collection of fame that i keep around to show people my various failed blown parts
When I talked to KB about their Hypereutechtic They told me that I was lucky with just a 3.48 stoke to be doing 7000+ rpm so many times
If you have a motor that you plan to run to say 6200 with a H-roller with high temps they just can't do it. I had KB's with a 355 ci and they pistons vurtually melted. They became mush would be the best description. The pistons skirts smeared and filled the ring lands wedging the rings into what sounded like bad rod knock. Upon tear down I had smeared aluminum on the bores and the pistons were oval.
It was a severe test :smash: I was testing on a well broke in motor for one of the Nevada open road races. Before that i had them doing well over 7000 rpm at drags races for many 1/4's Sustained high rpm something like 20 minutes and they were gone. If you would like a picture I can go take one. :) it's in my failed parts collection of fame that i keep around to show people my various failed blown parts
When I talked to KB about their Hypereutechtic They told me that I was lucky with just a 3.48 stoke to be doing 7000+ rpm so many times
Thread Starter
Racer
Joined: Apr 2003
Posts: 286
Likes: 2
From: Suffolk VA
Re: Hypereutechtic or Forged?? (gkull)
:shocked:
Well, that doesn't sound like a fun day at all...I don't need any melted pistons and if 400hp is all they're good for then I wouldn't call them "Bullet proof"
Guess I'd better stick with what I know works then. Looks like JE will be getting a call from me :cool:
Well, that doesn't sound like a fun day at all...I don't need any melted pistons and if 400hp is all they're good for then I wouldn't call them "Bullet proof"
Guess I'd better stick with what I know works then. Looks like JE will be getting a call from me :cool: