durability of JH block internals and going turbo

[marc_scirocco@yahoo.ca (Marc scirocco Québec)]

Aren't the 3A Audi rods riffle drilled?

And the JH'S rods not being riffle drilled?

Cheers.

Marc
'83 scirocco
'88 Scirocco Slegato

--- Dan Bubb <jdbubb@ix.netcom.com> a écrit : > As far
as I know the JH and 3A rods are the same
> length at 144mm center
> to center. The extra stroke is accomodated by moving
> the piston pin a
> little higher in the piston.
> The JH really is a good starting point cause it's
> rugged and it has a
> low compression ratio. The 3A is good because of the
> greater
> displacement (which probably won't make a huge
> difference in ulitmate
> power, but will be alot more driveable off boost), I
> think it has piston
> oil squirters (although I can't find the 3A in ETKA
> to save my ass) but
> it's really big drawback for a turbo application is
> the 10:1 CR. So,
> special pistons or the ghetto fix of stacking head
> gaskets.
> Joe Doty's post on this subject is on the money and
> highlites the
> critical issue here. I just assumed fuel and
> ignition would be correct
> in stating the JH could handle 200 Hp. No engine
> will make even
> moderately large power if the fuel and ignition are
> hosed.
> Hopefully, in the next few months I'll be putting a
> T3/T04E on a JH
> fueled with a Haltech E6K. I want to see how much I
> can make before I go
> back to a 2.0 and add the turbo to that.
> Dan
> 
> 
> Jeff Toomasson wrote:
> > 
> > Thanks, Dan - definitely a good starting point.
> > 
> > One more question (actually, two, I guess...): can
> one use JH rods with 3A
> > crank and pistons in a 3A block to lower
> compression?  Would the added
> > displacement make as much difference in a forced
> induction setup as it does
> > N/A? I guess that opens up reference point issues,
> but just humor me...  :)
> > 
> > Thanks again - JT
> > ----- Original Message -----
> > From: "Dan Bubb" <jdbubb@ix.netcom.com>
> > To: "Jeff Toomasson" <jtoomasson@yahoo.com>
> > Cc: <scirocco-l@scirocco.org>
> > Sent: Monday, October 28, 2002 1:11 PM
> > Subject: Re: durability of JH block internals and
> going turbo
> > 
> > > I think the general consensus on the VW Hardcore
> forum is that the stock
> > > JH internals are good for at least 200 hp. You
> might want to go there at
> > > www.vwsport.com and look for the Hardcore forum.
> The top thread is about
> > > the easy way to get 200 hp.
> > > As far as new pistons; new as in slightly
> oversize? of something special
> > > like forged?
> > > I think the stock pistons can handle it, but if
> they're worn or there is
> > > a lot of blowby, that might cause some problems.
> > > Dan
> > >
> > > > Jeff Toomasson wrote:
> > > >
> > > > I was curious what the general consensus is on
> the durability of stock
> > > > JH internals (i.e., crank, rods, pistons,
> etc.)
> > > >
> > > > The reason I ask is that I have really no idea
> what rigors a JH block
> > > > could withstand.
> > > >
> > > > Given a rebuild, knifing the crank and
> balancing the internals - could
> > > > the stock components RELIABLY handle ~200 whp
> and the ~15psi of boost
> > > > required to get there?
> > > >
> > > > I repeatedly see people going with new
> pistons, rods, etc., but I
> > > > don't ever see anyone talk of the benefits
> (other than increasing
> > > > bore) that those pistons are supposed to
> achieve...
> > > >
> > > > TIA, JT
> 
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