pistons

[brougham]

We all know that ross, je ,srp, pro tru, wiseco are a top line piston but for those how run on the streets with 500 plus hp what are the pistons like kb forges & hypetecks. speed pro. probe. trw pistons are like any thorts

[lun40119]

I am not a professional by any stretch of the imagination, but I do know what I have done and if it has worked and not worked. I have broken stuff like everyone else has, and learned from it. I did run a set of hypereutectic aluminum pistons for 3 years. Spun that engine to 6800 religously, and it was fine. Changed the pistons when I changed cranks, otherwise I think they would still be in there. It is my opinion that on a naturally aspirated non nitrous street engine some of these pistons would be great. On a boosted or sprayed application, I wouldn't trust them.

It doesnt appear you are looking for an answer, more like some opinions. That is mine................take care

Jake

[lun40119]

I was just sittin here thinkin again, I think alot would depend on the cubic inch of the engine also. If you were going to try to make 500+hp with a SBC 350, you will have to really run it.........however on a 454, or 502, I think your 500 hp goal could be reached pretty easily, with the pistons in question. Just another couple cents.........take care.

Jake

[brougham]

With the engine it is a 400 sbc revs will be in the 6500 range driven as a weekend car as for money side of thinds i live in australia and the difference is $400 so you can see u i am asking about the brands . I had wieseco in my drag car and they where great

[Trmnatr]

With the engine it is a 400 sbc revs will be in the 6500 range driven as a weekend car as for money side of thinds i live in australia and the difference is $400 so you can see u i am asking about the brands . I had wieseco in my drag car and they where great

In our Camaro it has been 10.436 @127.4mph @ 6,500rpm past the lights with a junk 406 as follows - soon to have Dart 49cc heads on it

-406
-.030" over KB Hyper's cc's at 11.5:1
-283 heads bowl ported with 2.02/1.6 valves, 3 angle valvo job, cut for screw in studs and 1.46" springs 58cc chambers milled additional .015"
-we have an excellent cam thanks to Chase Knight, Flat tappet saturday night special as follows
256/264 @.050 .545/.563 105° lobe seperation installed @ 102°
-BG 850 carburetor modified by us
-victor jr {soon to be Dart when we install Dart 49cc heads and roller cam}
-power glide with 4,500rpm stall
-32" rear tires with 4.88 gears

We shift at 6,000rpm and run 6,500rpm past the lights. 1980 Camaro weighing in at 2,780 pounds race weight

So to your original question, Yes you could run hypers, The KB Premium forged pistons are very nice and are light, TRW's are good, Bill Miller is the best, JE is good

In our other race car we run TRW's {TRW/Speed-pro} but they are very very heavy pistons

[Awesome Bill]

I can hardly believe they are 283 old powerpac heads you have done all that work on. They were very small intake runners and you have done well getting what you have from them, btw, you making 450 hp from your mixed up junker as you have described it. Not too bad for junk!
There is really no difference when it comes to the KB or Speed Pro Hyp stuff. I have talked to the owner @ KB @ the PRI show and he says his stuff will handle 3000 hp?. I guess it will if its been done as he has said. I have no problems with pistons that were made to be beat on. Cast pistons with the steel plates around the wrist pins tells you 500hp is all she takes and I have proved it many times.
We used to run some 454's on pump gas back in the early 90's and run the stock short block with flat tops and the very small domed stuff (badger piston, cheaper the better) with truck oval ports cleaned up and a flat tappet cam. 3200 lb Nova run 10.50's all day long on pump gas and was only 9.9-1 compression. Put race gas in it and it slowed down 2-10ths. Made racing fun and cheap. But, 30-35 passes on 4 different sets of pistons and they would pull the bottoms right out. Did not really do any bad damage until the last set let go. Took everything out.
We changed up to the KB stuff and after knocking the tops out with NOS stuff, (did not allow enought ring gap while making more heat, we adjusted the gap, purchased 4 pistons and that thing would run 9.50's with a 150 shot of juice with the geared pulled from 4.56 back to 3.70's. and still going threw over 6500, converter never would catch up, Never did hurt the engine and its still in service somewhere.
So, for the record, any pistons manufactured from hyp stuff, up to 25% silicon, or 4032 13% silicon material or 2618 material which is ¼% silicon, they will take 500hp all day long as long as you do not run enough heat and but the rings or detonate and cause the black death condition. Older heavier TRW pistons like the old 2256 sbc stuff were very good pistons and still are good. I would not 2 stage that stuff but they are very capable of handling 500-600 hp with a decent set of pins and machine work. jmo

[Trmnatr]

I can hardly believe they are 283 old powerpac heads you have done all that work on. They were very small intake runners and you have done well getting what you have from them, btw, you making 450 hp from your mixed up junker as you have described it. Not too bad for junk!
There is really no difference when it comes to the KB or Speed Pro Hyp stuff. I have talked to the owner @ KB @ the PRI show and he says his stuff will handle 3000 hp?. I guess it will if its been done as he has said. I have no problems with pistons that were made to be beat on. Cast pistons with the steel plates around the wrist pins tells you 500hp is all she takes and I have proved it many times.
We used to run some 454's on pump gas back in the early 90's and run the stock short block with flat tops and the very small domed stuff (badger piston, cheaper the better) with truck oval ports cleaned up and a flat tappet cam. 3200 lb Nova run 10.50's all day long on pump gas and was only 9.9-1 compression. Put race gas in it and it slowed down 2-10ths. Made racing fun and cheap. But, 30-35 passes on 4 different sets of pistons and they would pull the bottoms right out. Did not really do any bad damage until the last set let go. Took everything out.
We changed up to the KB stuff and after knocking the tops out with NOS stuff, (did not allow enought ring gap while making more heat, we adjusted the gap, purchased 4 pistons and that thing would run 9.50's with a 150 shot of juice with the geared pulled from 4.56 back to 3.70's. and still going threw over 6500, converter never would catch up, Never did hurt the engine and its still in service somewhere.
So, for the record, any pistons manufactured from hyp stuff, up to 25% silicon, or 4032 13% silicon material or 2618 material which is ¼% silicon, they will take 500hp all day long as long as you do not run enough heat and but the rings or detonate and cause the black death condition. Older heavier TRW pistons like the old 2256 sbc stuff were very good pistons and still are good. I would not 2 stage that stuff but they are very capable of handling 500-600 hp with a decent set of pins and machine work. jmo

I like 2618 forgings.

We didnt expect the engine to run like it does. I think the only reson it does is our cam grinder suggested a very tight lobe center and centerline to get the heads to work at all on the combo

The 49cc Dart heads {215cc runners} along with the roller cam we are gonna go with should wake it up, looking for 10.20's

Roller cam we will be installing will be either 106° or 108° lobe center
260/268 @.050 .670/.625

[lun40119]

Made racing fun and cheap. But, 30-35 passes on 4 different sets of pistons and they would pull the bottoms right out. Did not really do any bad damage until the last set let go. Took everything out.


Bill you kind of made my point. Why not just put the good pistons in it. I understand it is a little more money, but the reliability and longevity of the rotator (IMO) is well worth it. Take the turd for instance. That is a 500+ dyno proven horsepower, 12:1 street engine, with a 3.48 stroke,SBC, that did not cost a ton of money. It has 18,000 plus street and track miles on the rotator. 2 sets of heads, 3 different cams, and numerous springs. I don't ever worry about it. It does run on good gas though (ALWAYS). This is the last summer on this kit though, time for something bigger and better :D

I guess I would just look at the reliability factor, when putting stuff together. I am not trying to attack your statement, just use the example.

Jake

[Awesome Bill]

Any time anyone builds an engine, they have to look at cost and usage. If it breaks with the cheaper less expensive stuff, they scream like bloody murder. If it breaks with the good stuff, they will kill you.

Now if you put a low cost unit together and most likely it runs very well, they say "see I told you thats all you need" if it breaks after what they have told you what to build, then you can say, "should of upgraded that crank. I like the ladder. I

always suggest the best as you would, but sometimes the best cost to much and even the stock crank stuff runs great. Just done a dirt engine and the guy broke 5 cast 350 stock cranks. So he was broke. I took his chicken sh__ and made a wonderful plate of chicken salad with a Scat cast 3.48 crank, dyno beat the heck out of it and got it tuned right and told him to go at it. The engine made just shy of 450 hp for his dirt engine and did not shake at all, (we balanced it, he never did). First week out, he won and praised us like we have never been talked about. He was broke and that was all he needed was some expert advise and machine work.

So if you use the cheaper stuff and it works, your a hero, if you sell them what they want and it breaks, it better at least run good. It usually is a no win situation unless they are very informed. I have no problem using any thing that is what the customer wants and can afford. We always try to shoot for quality. But, you can have the best parts as you very well know and not make a lap if it is not tested and machined correctly. Daddy always said " give a brand new Caddy to a monkey and he will get it started but more likely than not, he will put dents on it or wreck it!"

[lun40119]

Couldn't agree more Bill...............never time or money to do it right the first time, but always time to do it over. :D

[Awesome Bill]

Been there done that!