cross-flow vs g60

[drew at scirocco.cs.uoguelph.ca (Drew MacPherson)]

You know, I stopped and thought about that when I sent the initial
response, as the number 38 stuck in my head.  I convinced my failing
memory that the GX/MZ heads had 38mm intakes, and the HT and RD heads had
40mm intakes.

FWIW the hydro version of the JH/2H uses the same intake valves as HT/RD -
p/n 048 109 601 A.

The TTuning site, as Dan pointed out, also lists the 85+ GTI as having 
40mm intake, and the "regular" Golf/Jetta as having 38mm intake.

I'd say if you had 38mm intakes you dind't have an HT/RD head, but a GX/MZ 
head.  Note that the PF and RV (digifant) motors also use the 40MM 
intakes.

Drew

On Tue, 4 Nov 2003, Brian McGarvey wrote:

> 
> Uhm
> actually the GLI hydro head has 38mm intakes. Just ask Cheapass ron if you 
> dont belive me. W ran into that problem. 
> brian
> 
> On Tue, 4 Nov 2003, Drew MacPherson wrote:
> 
> > 
> > The JH and HT/RD heads are 40mm intake and 33mm exhaust.  Both are 8mm
> > valve stems, the solid lifter valves being longer than the hydro version.  
> > 
> > I believe the ABA uses the same 40mm intake/33mm exhaust with 7mm stems,
> > but don't quote me on it.
> > 
> > Drew
> > 
> > 
> > On Tue, 4 Nov 2003, Patrick Bureau wrote:
> > 
> > > how about valve sizes?  I am considering this ITVB setup and I can use a JH
> > > or a xflow head (depending if I want the flutes to be out back or in
> > > front...but I have been trying to get intake/exhaust valve sizes, surely
> > > someone has those numbers somewhere no ?
> > > 
> > > ATS - Patrick Bureau
> > > 
> > > 
> > > ->-----Original Message-----
> > > ->From: scirocco-l-bounces@scirocco.org
> > > ->[mailto:scirocco-l-bounces@scirocco.org]On Behalf Of Drew MacPherson
> > > ->Sent: Tuesday, November 04, 2003 6:27 AM
> > > ->To: Dan Smith
> > > ->Cc: Scirocco ML
> > > ->Subject: Re: cross-flow vs g60
> > > ->
> > > ->
> > > ->On Mon, 3 Nov 2003, Dan Smith wrote:
> > > ->
> > > ->> can be had for next to nothing. RD heads are found on late 80s GTIs and
> > > ->> I think Jetta GLs. They're hydro, slightly harder to come by and it's a
> > > ->
> > > ->HT = 85 GTI/GLI, RD = 86,87 GTI/GLI (actually, Jettas came with 'em part
> > > ->way through 88 as well)
> > > ->
> > > ->> good idea to run a knock sensor with it as compression is slightly
> > > ->> higher. I'm sure others with more experience in this area will chime in
> > > ->> as well.
> > > ->
> > > ->AFAIK the combustion chamber size is the same between the JH head and the
> > > ->HT/RD heads.  The difference in the compression ratio is in the pistons.
> > > ->
> > > ->>
> > > ->> Dan
> > > ->
> > > ->--
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> > > 
> > 
> > 
> 
> 

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