RE: Why buy Forged Pistons?

["Scott F. Williams" <sfwilliams@home.com>]

I run JE forged pistons in my 323GTX. I do get a little puff of smoke during
cold starts. This is slightly annoying but is really no big deal at all. The
pistons do also make a little racket until they are warmed up at least one
minute. However, I have alleviated that noise by coating the skirts with a
dry lubricant from Swain Technologies <www.swaintech.com>.

This reduces the noise from piston slap and also lessens any scuffing in the
cylinder bore. I also had the tops of the pistons coated with Swain's "Gold
Coat" heat barrier treatment. Given the decreased friction on the skirts and
less heat in the pistons, I was able to run a slightly tighter tolerance.

Still, the main point of forged pistons is to be able to run huge cylinder
pressures. If you're going with nitrous, forced aspiration, or just huge
compression, it is a very good idea -essential, in fact. Huge rpms call for
a stronger piston, too, but you'll also have to use stronger rods,
valvetrain components, fasteners, etc. If none of the above conditions
apply, then go with cast and just call it a day.

YMMV...

P.S. Forged pistons with a high silicon content expand less than those with
a low silicon content. The high silicon content pistons are more brittle,
however, so it is somewhat of a compromise between the tougher forged and
the stock cast stuff. JE makes low silicon pistons.
--
Scott F. Williams
NJ Scirocco nut
Golf GTI 16v rallycar
Mazda 323 GTX turbo assault vehicle

Check out our rally team's website!
http://www.usrallyteam.com

> -----Original Message-----
> From: owner-scirocco-l@scirocco.org
> [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Shawn C Meze
> Sent: Wednesday, August 15, 2001 1:04 AM
> To: winggee@hotmail.com
> Cc: scirocco-l@scirocco.org
> Subject: Re: Why buy Forged Pistons?
>
>
>
> On Tue, 14 Aug 2001 20:45:47 -0700 "Wing Gee" <winggee@hotmail.com>
> writes:
> >forged piston just has a higher tolerance to knocking than cast..
> >probably
> >stands up to more heat. if you have a perfectly tuned motor, i think
> >stock
> >pistons would work just as well to a certain degree... as for me.. i
> >want
> >mad power... :-) like 250-300 at the wheel :-) i figure since my motor
> >is
> >apart. i might as well. at least that's what i think. someone feel
> >free to
> >correct me as i may be wrong..
> >
> >Wing
>
>
> I could go on for days on this subject but I wont. You all can thank me
> by sending cash. That will be fine. :)
>
> The short version is this:
> Forged pistons offer lighter weight which is better for high rpm's.
> They're a little stronger than cast (alignment of atoms on the production
> process... oops, too much details.. sorry!) which means they will
> tolerate high heat a little better as well.
>
> The downside is you will see a definite consumption of oil since they
> require a much larger clearance to accommodate the clearance
> requirements. Another downside is the clatter diesel sound it makes when
> its cold or when its idling for a long time. Some of the newer pistons
> claim that they have a new alloy that fixes this oil consumption problem
> and clatter. I have no experience or data to prove this claim.
>
> That's about it.
>
>
> Shawn Méze
> 86' Jetta GLi 8V       84' Scirocco 8V           88' Corvette -SS 30-
> 82' Scirocco GTi -FSP 54-     79' "Project FSP Scirocco"
> The Fastest, Quickest, Cleanest and best looking Scirocco in all of San
> Diego!
> http://www.Geocities.com/MotorCity/Speedway/1308/index.htm
>
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