pistons forged or hypereutectic

[moparjohnny]

383 hi po eng street only,small roller cam.3.55 gears,headers.i hear that forged will make a little noise until they are heated up,that would not bother me at all, want something durable,and quality. thanks

 

[BigYellaStella]

Spend the money on forged and be done with it, make it bulletproof

 

[mentor70]

IDK, in my experience, ive had more noise with the HYpers VS forged. mainly do to machine shops not setting clearances properly....if you can do it, go forged.

 

[lewtot184]

both hypers and high performance forged will make noise when cold. if the wrist pin is centered in the piston they'll rattle when cold. offset pins are quieter.

 

[Mopar Man 73]

A good high quality forged piston will always be better than the hypereutectic alloy. Most of the higher end manufacturers (like the one I work for) have better controlled tolerances and workmanship. Also, the hypereutectic material is more brittle due to the higher silica content. This material doesn't lend itself to higher precision machining as it chews up more tooling due to the hardness.
. We do carry a little 4032 material aside from the 2618 for certain engines like 361, 383, 413 and 426w, better for street and mild race applications like your project. If interested in further info on pistons for your 383, please in box me.
Mike

 

[moper]

Forged is better. Hypers are great value. Neither hypers or modern forged should be noisy when you start up unless the machinist screwed something up. Old school part number forged (read as cheap) might be noisy until they warm up. Modern alloys run much tighter piston to wall on forged and hypers. For a milder setup without boost I'd use hypers in a second. In fact, I have. In a bunch of them.

 

[furyus]

Not a fan of hypers. I spend the extra for peace of mind with the forged.

 

[lewtot184]

i've ran them both and no issues from either. hyper or forged?, ...... depends on what your doing. nothing should make noise when cold?,.......... then why does the factory use offset pins.

 

[747mopar]

I've ran Hyper pistons in my last 2 builds with no issues and no rattle. Forged is obviously a more durable piston but in my opinion Hyper pistons are easier on the bore without the chattering around.

 

[HawkRod]

My understanding is that a forged piston has to be a bit looser in the hole due to the fact that it will grow more than a hyper. I guess this means you can make a car with a hyper piston be a bit better from an oil usage and blow-by perspective? Not trying to pose as an expert by any stretch, and I am sure others will correct me if I recall incorrectly...

 

[furryfrog]

I am running 2618 forged, no rattle at all even when cold. It depends on what you set your piston to wall clearance at. My pistons came with manufacture recommendations depending on your intended power level. The recommendations surprised me with how tight they were. I got my machine shop to set mine at .0035 if I remember correctly.

 

[moper]

When piston material was different (like 50 years ago) they offset the pins for noise. Nothing modern does it because the materials are so different. Modern forged use alloys that do not expand at running temps, and run piston to wall clearances that are tighter. Older performance forgings would be quiet when new, unless the builder added clearance in those engines where a lot of heat or load were expected. "Loose is faster" was a common notion some years ago. Modern ones may run 1/2 of what the older ones did, and hypers are 30% less than that. Simple evolution of materials and scienc of ring seal.