I think the jury is still out as to whether the Five-Valve head is really
that superior to the 4-valve design. In Europe the normally aspirated
5-valve 1.8 liter makes approx. 130hp (72hp/liter) compared to the 150 made
by the 2.0 (75hp/liter). The 5-valve head has a lot more reciprocating mass
in the head along with the rocker design which limits cam profile design. I
doubt the costs justify the end result. For me, if I were to turbo a VW I
would use a G60 head. Same thing, designed for boost and you can easily get
250 HP out of that motor with a turbo.
Mark
From: John Caldwell <[email protected]>
To: Jassem <[email protected]>
CC: <[email protected]>
Subject: Re: OT: 1.8T stuff(my project-for those interested)
Date: Wed, 27 Jun 2001 10:30:12 -0600 (MDT)
On Wed, 27 Jun 2001, Jassem wrote:
> I'm sorry but I just don't see the point of swapping a similar
displacement
> engine simply because it's turbocharged. Since you'll be using Haltech
The big difference here is the 5 valve head. Plus, the entire motor,
bottom end, head, pistons, rods, crank, etc was designed from the ground
up to be a turbo motor.
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