building a new engine...lets talk pistons

Building another 283 for the coupe. Im not going crazy on the over bore just a clean up this time. Has anyone of you out there run the Hyperteutectic pistons. Ive only dealt with cast and forged and dont have any idea about these new alloy pistons. Ok I know they arent new.

I wanted to use this block for a blower engine but the reality of it is its not fesable at this time.

Im going to keep the compression around 10/1 and it is going to be balanced. Any thoughts on these pistons.

Thanks

 

Those are supposed to be great pistons for naturally aspirated engines. They were highly recommended to me by some auto machine shop guys I know because they were stronger than cast and cheaper than forged. For SBC, the last time I looked, they were a pretty reasonable price.

For blowers, although I don't regularly build supercharged engines, I have always been told that forged is the only way to go.

So if you're going to 'blow it' in the future, I'd say you should be prepared to switch to forged pistons and drastically drop your compression ratio from 10 to around 6-7 to 1.

Hope this helps,

Big Daddy Eric

 

Thanks for the response BigDdy. The price right now is what lead me towards those pistons. I have yet another 283 that will someday get the blower treatment when I can do it. The engine thats in the coupe now has some real issues and been rebuilt a couple times before so Im giving up on it.

 

Try a price quote from: www.northernautoparts.com

 

Hyperteutectic pistons are fine for most uses, blowers excepted. Follow the directions carefully for ring gaps and I think you will be very satisfied.

 

Just don't be surprised if you get some noise when they're cold.

 

Hypereutectic pistons are still castings, but have a higher silicon content, and a different copper content (can't remember off the top of my head right now if it's higher or lower...). This gives them higher strength than conventional casting alloys, particularly at higher temperatures. They aren't, however, as strong as most forgings. Follow the manufacturer's recommendations for piston-to-cylinder clearance (you can fit them tighter than forgings, since they will expand less, but it may differ from the factory clearance for conventional pistons). They should be able to stand up to 10:1 C.R.- modern, high compression motors like Chrysler's 3.5L run 10:1 on non-hypereutectic pistons- they just make sure they don't run too lean and get them too hot.