What are the pros and cons of forged pistions?

[bjl95mustang]

Now i'm looking at getting a set of forged trw stock style pistons and I wanted to know what were the benifets of using them on my 306?

 

[HISSIN50]

if you want a power adder or will run a good amount of power, they will hold up better (nitrous, forced induction, both , etc).

they do weight a smidge more than cast, hypers, etc, but it is WELL worth it. much more stout IMHO.

 

[Gearbanger 101]

Pros
Stronger
More durable

Cons
Heavier
More expensive
Take longer to expand during cold start up, which can cause them to be slightly noisy at times.

 

[bmorrisj]

if you want a power adder or will run a good amount of power, they will hold up better to detonation (nitrous, forced induction, both , etc).

they do weight a smidge more than cast, hypers, etc, but it is WELL worth it. much more stout IMHO.

with a good tune hyperuwreckedit's will work too....

 

[Gearbanger 101]

with a good tune hyperuwreckedit's will work too....

....to an extent. i wouldn't want to run much more than 8-9psi, or a 125-150hp shot of nitrous though a stock set of hypers. Nor would I consider shifting past 6000rpm very often either.

 

[NightStalkersSO]

I agree, there's a reason most supercharger kits aren't more than 9-11 psi....cause unless you have a built engine, there's a high chance of causing damage....I have seen engine with "cast" pistons though running 400 hp....some people get lucky though, I'd rather not take my chances

 

[EMW150]

The only pro that hypers have over forged is that you can run them tighter. On a 4" bore piston to wall clearance for a hyper is .0015-.0025 where a forged piston that same size would be .0035-.0045. This makes hypers better for cold start-up - also less piston rock and cylinder wear. So they're better on a daily driven car. A forged piston is lighter and stronger. A KB Hyper flat top for a 347 is 415 grams where a forged 347 flat top is 381 grams.

 

[bjl95mustang]

Thanks for the input guys. I'm going forged becuase i just found some trw's for $125

 

[bjl95mustang]

Are forged pistions less prone to detonation? Can I run a higher cr with them?

 

[EMW150]

I don't think they'd be less prone necessarily but they would take alot more before damage would occur.

 

[Michael Yount]

What EMW said - the forged units are more ductile than the hypereutectics. Over simplification - under the destructive forces of detonation, forged units "bend before they break" because of the greater ductility; hypers are harder, less ductile - they tend to "break before they bend".

 

[giddyup306]

Are forged pistions less prone to detonation?

The design itself is a much bigger factor. IE flattop vs popups.