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Tubro question re: JE Pistons

I've been running JE pistons on my car since '03. So far so good.

I have a PG block (aka Corrado G60). Pistons are more-or-less a standard FI dished crown, similar to stock G60, but made for144mm rods instead of the normal PG 136mm rods.

Compression is about 9.5:1 with a hydro 8v head that has tons of work done to it. 235whp/205wtq at ~11psi from a twin-screw supercharger.

Regarding boring specs: Boring/honing with a torque plate was strongly recommended, so I let Stu Brummer at BSI Racing handled my engine block work. Only place in Florida I could find with a VW torque plate. He highly recommended that I don't use as much bore clearance as JE recommends. Said that  unless I was planning to do hard-core, high-speed track racing, the pistons would never expand *that* much. IIRC (don't quote me on this), he more or less split the difference between the stock clearance and the JE recommendation. I wasn't so sure I wanted to risk it, but he basically insisted and I had nowhere else to go, so I said OK...and I've been happy so far. You can still hear a small amount of knock and see a bit of blow-by when the engine is cold, but nothing like some forged piston engines I've seen.

Neal

----- Original Message ----
From: Don Walter <dswalterwi@gmail.com>
To: Brian Spinney <vw_85roccoZ400@hotmail.com>
Cc: scirocco scirocco <scirocco-l@scirocco.org>
Sent: Monday, December 18, 2006 8:26:29 AM
Subject: Re: Tubro question re: JE Pistons

www.WiseCo.com

Here is another I had bookmarked for some reason.
http://www.importperformanceparts.net/imports/wisecopistons_vw.html

There was antoher really informative one but I can't find it now.  WiseCo
may have an off the shelf version which might be cheaper.


On 12/18/06, Brian Spinney <vw_85roccoZ400@hotmail.com> wrote:
>
> I've been running Wiseco pistons in my 8v turbo for the past 2 years.
> Although I have only put around 5k on the motor I really like the pistons.
> I was in the same boat JE or Wiseco, I did some searching and found that
> more people suggested Wiseco for FI.
>
> I also haven't had any big problems with detonation, there has been some
> from time to time but that was more due to the lack of fuel + to much
> boost.
>
> -Brian
> 85 Scirocco 8vT       01 Jetta 20vT       84 Rabbit GTI
> 86 Bronze Scirocco 8v
> ----- Original Message -----
> From: "Don Walter" <dswalterwi@gmail.com>
> To: "Dan Bubb" <jdbubb@verizon.net>
> Cc: "scirocco scirocco" <scirocco-l@scirocco.org>
> Sent: Sunday, December 17, 2006 10:07 PM
> Subject: Re: Tubro question re: JE Pistons
>
>
> > JE Pistons is owned by WiseCo.  WiseCo is their premium pistons and are
> > better design.  They have many features that the JE's do not.  The best
> > one
> > is that they use an offset wrist pin design to eliminate the piston slap
> > and
> > the oil scraper ring is 3mm unlike the 1mm on the stock 2.0Lengine.  You
> > will not have good luck trying to go through their distributors as they
> > will
> > make you buy 8 pstons.  I called the company direct and they were happy
> to
> > take my order direct.  In fact they did not have an off the shelf 16V
> > design
> > so they designed one on Solidworks for me. They added the domed area for
> > the
> > squish area, although you would want a dish for lower compression.  Mine
> > was
> > 10.5:1  I sent them one of my pistons for verification.  I had them give
> > me
> > an extra 0.050 cleareance for the valves. The best part is that they
> were
> > cheaper than their JE counterpart and they were custom made.  I paid
> $500
> > if
> > I recall.  Let me know if you want any other information.
> >
> > Here is a link to my custom made pistons:
> > http://scirocco.dyn.dhs.org/vw/list/Don_Walter/WiseCo%2016V%20Pistons/
> >
> >
> > On 12/17/06, Dan Bubb <jdbubb@verizon.net> wrote:
> >>
> >>
> >>
> http://i9.photobucket.com/albums/a95/jdbubb/86%20JH%20Turbo/DSC02781_small.jpg
> >> On the right is a JE piston. 83mm, 9:1 CR, 8V, for an 86.4mm stroke.
> >> On the left is a Wiseco piston. 83mm, 9:1 CR, 8V for a 92.8mm stroke.
> >> See those little pads on the sides of the top of the Wiseco piston?
> >> Those pads come within .040" of the sides of the combustion chamber
> that
> >> you
> >> can see here:
> >>
> >>
> http://i9.photobucket.com/albums/a95/jdbubb/86%20JH%20Turbo/DSC02885_small.jpg
> >> and form a squish area that creates turbulence in the combustion
> chamber
> >> and
> >> makes the engine more resistant to detonation.
> >> IMO the Wiseco is a better piston simply for this reason.
> >> The JE is in my nephew's engine and it's not as resistant to pinging as
> >> we'd
> >> like. i.e he can't run as much boost as he'd like.
> >> My engine is just getting broken in so I can't verify that it'll be
> >> better,
> >> but an engine with well setup squish areas has always performed well
> for
> >> me.
> >>
> >> Double head gasket lacks a squish area just like the JE piston. A
> >> non-starter in my book although a lot of people do it.
> >>
> >> Forged pistons need a slightly larger cylinder clearance since they
> have
> >> higher thermal expansion. I can't hear any piston slap. You just need
> to
> >> take it easy till they warm up a little.
> >>
> >> Both JE and Wiseco run about $550-575 for a set of 4 with rings and
> pins.
> >> http://www.jrcmotorsports.com/ carries JE.
> >> www.porttuning.com carries Wiseco.
> >> I'm sure there are other suppliers.
> >> Dan
> >>
> >>
> >> From: "David Brown" <sharpshooter33@roadrunner.com>
> >> To: "scirocco scirocco" <scirocco-l@scirocco.org>
> >> Sent: Saturday, December 16, 2006 11:26 PM
> >> Subject: Tubro question re: JE Pistons
> >>
> >>
> >> If I go with a 3A or 9A does anybody have experience with 2.0 16V JE
> 83mm
> >> 9:1 Pistons?
> >>
> >> I also remember reading somewhere that forged pistons have a looser fit
> >> than
> >> cast?  Is this still true or is that a story started by someone along
> >> time
> >> ago.
> >>
> >> What is a good price for them and where can I get them?
> >> What would my other options be?  I have also heard of the double head
> >> gasket
> >> method.
> >>
> >> Thanks
> >> David
> >> _______________________________________________
> >> 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
> >>
> >
> >
> >
> > --
> > Don Walter - Waukesha, WI
> > 1986 8V Black Scirocco (Daily Driver)
> > 1984 8V Audi 4000s (RIP 2/14/2006)
> > 1986 2.0L 16V TEC 2 Black Scirocco (see progress at
> > http://www.cardomain.com/memberpage/708939)
> > 1986 2L 16V Toronado Red Scirocco (Ben's Car)
> > 1988 1.8 16V Toronado Red Scirocco (sold on 3/29/04)
> > 1984 1.8 8V Pewter Scirocco (sold years ago)
> > 1971 Karman Ghia (sold)
> > 1969 Karman Ghia (sold)
> > 1969 Beetle (sold)
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
> >
>
>


-- 
Don Walter - Waukesha, WI
1986 8V Black Scirocco (Daily Driver)
1984 8V Audi 4000s (RIP 2/14/2006)
1986 2.0L 16V TEC 2 Black Scirocco (see progress at
http://www.cardomain.com/memberpage/708939)
1986 2L 16V Toronado Red Scirocco (Ben's Car)
1988 1.8 16V Toronado Red Scirocco (sold on 3/29/04)
1984 1.8 8V Pewter Scirocco (sold years ago)
1971 Karman Ghia (sold)
1969 Karman Ghia (sold)
1969 Beetle (sold)
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