HELP!! Need pistons questions answered ASAP

[brianm at earendel.org (Brian McGarvey)]

CheapassGRM'n here

Why not go 8v :-)
 grab the 8v pistons out of an Audi 100,200,5000 -- 10v Turbo 
(easy to find)
 or the 16v pistons out of a 200 20v 
(Hard to find)
 and the exhaust manifold and kkk26 and waste gate. 
gets you the compression you want, the all fit together
and your basically making a stock VW/AUDI motor with one less clyn. 

the GRM team will be doing this soon.
:-)
anybody got 4 out of 5 audi 20v (5clyn) pistons they want to part with? 
I'll take the rods too.

Oh yeah.
I *might* have a 20/20 setup for sale soon. :-) gotta buy a trailer. 
If you dont know what a 20/20 is www.race101.com


On Sat, 17 Apr 2004, Dan Bubb wrote:

> I think this is the general consensus that I've heard also.
> One additional consideration is that if you're going forced induction a cast piston may be strong
> enough for your application, but you may not be able to get the compression ratio you want with a
> cast piston (cast pistons not generally available with custom crowns) and that alone may force you
> to use a forged piston.
> A second issue that no one has mentioned is that there are two common alloys used in forged pistons.
> 2618 is, I beleive, the alloy that is not suitable for street use and has given forged pistons their
> reputation for piston slap when cold and wearing out rings prematurely. It is a high strength alloy
> that has a higher coefficient of thermal expansion than cast material requiring sizeable piston to
> wall clearance.
> 4032 is a more recent alloy. It's not as strong as 2618, but still stronger than cast. It's
> coefficient of thermal expansion is also between cast and 2618 so it can have cylinder clearances
> approaching that of a cast piston. I've heard some people say this is entirely streetable. I've also
> heard some people say pigs can fly, so take it with a grain of salt.
> I think the big issue with forged is simply the bigger cylinder clearance and if the manufacturer's
> recommended clearance is close to stock, then there is no downside.
> Not sure if this is true of VAG pistons, but a lot of cast pistons have very small thermal expansion
> because they have a steel insert under the crown. Tough to do with a forging. I'll have to dig out a
> magnet.
> Dan
> 
> ----- Original Message -----
> From: "Tommy YUHAS" <h2ovwdrvr@msn.com>
> To: <stetson@unrealexpectations.ath.cx>
> Cc: <Scirocco-l@scirocco.org>
> Sent: Saturday, April 17, 2004 3:38 AM
> Subject: RE: HELP!! Need pistons questions answered ASAP
> 
> 
> > Ok as I have been piston shopping of late building a little something
> > special for my 80 Jeffs old car. I will be running a lysholm on a 16v block
> > with a 20v head with a 8.5 to 1 cr and 15 to 17 psi boost. As for forged vs
> > cast everyone I have talked to that I trust are telling me if you plan to
> > daily drive it go cast even in a race motor on a vw the cast are your better
> > option. The only option that I have been recomended forged on is if that
> > motor is going to be race use only and going to be kept in the very high rpm
> > range always 7500 to 9500 rpm if not it is not worth the extra cost and the
> > wear and tear of rings. I still have not decided on that motor what I am
> > going to do because it won't see much street use. I am going to experiment
> > with the current motor at very high cr and high rev valve train going to see
> > the damage I do with cast pistons while the other motor is getting built.
> >
> > My 81 is a 3a and I am going to keep the factory pistons and throw some mild
> > boost at it for that motor and it use as a weekend play toy that is ideal
> >
> >
> > >From: stetson <tim@unrealexpectations.ath.cx>
> > >Reply-To: stetson@unrealexpectations.ath.cx
> > >To: scirocco list <scirocco-l@scirocco.org>
> > >Subject: HELP!! Need pistons questions answered ASAP
> > >Date: Fri, 16 Apr 2004 14:22:56 -0500 (CDT)
> > >
> > >K then,
> > >
> > >A rather demanding topic I know...but I'm under the gun here.
> > >
> > >So....as you know, the 3A is in the shop where it was granted a clean bill
> > >of health for just about everything EXCEPT the cylinder bore.
> > >
> > >That needs to be milled .50mm over stock.
> > >
> > >This means I need new pistons (the shop will not bore w/o them in hand). I
> > >would like to get some nice hypereutetic <sp?> or forged and the only
> > >place I'm finding for them is Autotech for........
> > >
> > >$750 !!!!!!!!!!!
> > >
> > >YEA GODS AND LITTLE FISHES!!!!!!!!!
> > >
> > >Right now for block cleaning, tolerence checking, magnafluxing, and boring
> > >it's costing me $260 +tax. This means if I can find a cheaper piston set I
> > >could perhaps get it blueprinted and balanced.
> > >
> > >I want to do this to this engine ONCE, no more. The engine may not stay w/
> > >this Roc but I want to have a known, proven, hardened engine @ the end of
> > >this fiscal blood letting that I KNOW is good.
> > >
> > >I have Dave @ Adirondack checking into pistons for me right now (Potter
> > >can't get 'em) but will appreciate any and all info or recommendations!
> > >
> > >Are there any pistons from a ABA or 2.0 16v that could be used in it's
> > >place? Weisco's site has them listed that seem to have the same diameter I
> > >need (83mm) and the right rod length I need (144mm) and the right
> > >compression (10.4-10.5).
> > >
> > >Any thoughts Uber-Dubbers?
> > >
> > >Burning up my mail accounts quotas,
> > >
> > >Tim
> > >
> > >
> > >New York is a jungle, they tell you.  You could go further, and say that
> > >New York is a jungle.  New York *is a jungle.*  Beneath the columns of
> > >the old rain forest, made of melting macadam, the mean Limpopo of swamped
> > >Ninth Avenue bears an angry argosy of crocs and dragons, tiger fish, noise
> > >machines, sweating rainmakers.  On the corners stand witchdoctors and
> > >headhunters, babbling voodoo-men -- the natives, the jungle-smart natives.
> > >And at night, under the equatorial overgrowth and heat-holding cloud
> > >cover, you hear the ragged parrot-hoot and monkeysqueak of the sirens,
> > >and then fires flower to ward off monsters.  Careful: the streets are
> > >sprung with pits and nets and traps.  Hire a guide.  Pack your snakebite
> > >gook and your blowdart serum.  Take it seriously.  You have to get a
> > >bit jungle-wise.
> > >-- Martin Amis, _Money_
> > >
> > >
> > >
> > >_______________________________________________
> > >Scirocco-l mailing list
> > >Scirocco-l@scirocco.org
> > >http://neubayern.net/mailman/listinfo/scirocco-l
> >
> > _________________________________________________________________
> > Watch LIVE baseball games on your computer with MLB.TV, included with MSN
> > Premium!
> > http://join.msn.com/?page=features/mlb&pgmarket=en-us/go/onm00200439ave/direct/01/
> >
> >
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
> 
> 
> 
> _______________________________________________
> Scirocco-l mailing list
> Scirocco-l@scirocco.org
> http://neubayern.net/mailman/listinfo/scirocco-l
> 

-- 
-------------------------------------------------------------
Brian 
88 16v $2004 GRM challenge car http://www.grmotorsports.com
84 0v Next years car? mid engine... maybe we'll see
82 0v Black 16v kit --parts
82 2.0L Topless bunny -- Knock Ignition and bigger clutch. next.
90 90q20v doing daily driver duty. 
91 VFR750F everybody needs a 11-12 sec vehicle.

Contact method. Email me for AIM, ICQ, YahooIM, IRC, etc.
-------------------------------------------------------------