Re:Forged Piston Noise when cold, Piston material or pin placement?

[Guynn <amx69@xxxxxxxxxx>]

The argument for or against forged pistons, at this time in ''amc parts 
history'' is a little bit wasteful. The thing that really matters is 
''what pistons can I buy??? 

Let's say I want 10.0 compression 401 piston. No one evewr made such a 
trhing in cast. So, if this is the compression I want, I only have one 
choice, but5 custom forged pistons. Same deal if I want 9.0 cast 390 
pistons. No one ever made such a piston. Change to 360 size. You want 
10.0 for a 360?? Not available, and never was.

As time marches on, companies sell out, go bankrupt, etc. Fewer and 
fewer companies build a cast ppiston for a low/ out of production 
engine. The choice narrows quiet a bit. You end up with what we, the AMC 
hobby has, NOTHING available in any compression except mundane stock, 
LOW compression cast pistons available. So, if you just absolutely must 
have a cast piston, then learn to live with the power a low compression 
piston makes because thast is all that is available, and all that is 
likely to become available. STOCK, replacement compressions. And, get 
another clue, These rtoo will dry up. In time you can forget about ever 
buying Cast pistons for your AMC because they will cease production.

Also, it seems some folks forget just how many Production engines are 
built using Forged pistons. Nearly every single Hi=Po motorcycle ever 
built. Ever 426 Hemi ever built. Every BB Chevy with over 11 to 1 
compression. Every 302 Chevy. Every SD 455 Pontiac, Every SVO Mustang, 
and the list goes on, and on. Also, nearly every piston driven aircraft 
uses forged pistons. I guess all these and other engines are not fit to 
use by some folks account because of piston noise. Solid lifter cams 
make more noise than hydraulic lifter cams too. So What?? Big Deal. If 
you expect to build a Hot Rod, then expect a little more noise than a 
stone stock engine. If you want a whisper quiet engine, then build it 
with the stock parts and let it idle so low you can't even tell if it is 
running.

You can argue Forged or Cast all you please, but it all bolis down to 
''What can you buy''??? If you cannot buy a cast piston for your own 
personal application, then you must buy a forged unit. Strength does not 
play in this, Noise does not play in this, what plays is, what parts are 
available, plain & simple.



Nearly all engine noise is due to the clearences set up in the engine. 
Just as has been pointed out plainly by Nick.

Regards,

Randy Guynn