Re: [tech] which head?

[Night Shadow <soltwede@privateI.com>]

>  From what I understand, the two heads are the same when it comes to
> valves and combustion chamber.  The increased compression for the RD
> motor comes from different pistons.  In theory, you could practically
> 'make' an RD motor by putting RD style pistons in a JH...although with
> the increased compression comes a need for a knock sensor.  Switching
> pistons and installing the KS system from a later model car is
> a mod I don't hear about people with JH's doing often enough really. If
> I was tuning a JH, I'd do it.

You are right Brett, it is just a Piston difference.  I had a JH with RD
pisons and a g-grind.  That motor ran like a raped ape till it spun a rod
bearing.  Chucked it in favor of the hydro-head JH from an 88 Cabriolet.
It was a dissapointing change, let me tell you.

Eric

80 Scirocco (GF's Daily Driver)
81 Scirocco S (2.0 16v swap and complete restoration in progress)
91 Cabriolet (2.0 8v swap and mechanical rebuild in progress)
97 Golf Trek (Parts car)
00 Golf GL TDI (My Daily Driver)

"For Aquarians, the physics of loopholes is a perfectly valid science."
-Kelli Fox


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