Tubro question re: JE Pistons

[jdbubb at verizon.net (Dan Bubb)]

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
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