Re: [T2] Re: DP to SP conversion

["Jake Raby" <rabysvw@xxxxxxxxxxxxxxx>]

A major reason that VW went to dual port was for fuel injection......And
smog requirements...

I feel it was the worst move they made, I love single ports, and thats the
only thing I will build for a Bus, other than a type IV...
Jake Raby
Raby's Aircooled Technology
http://www.aircooledtechnology.com
----- Original Message -----
From: "George Lyle" <glyle@xxxxxxxxxxxxx>
To: "Stockton, Andrew" <apstockton@xxxxxxxxxxxxx>
Cc: <rswhitaker@xxxxxxxxxxxxxxxxxx>; <type2@xxxxxxxxxxxxx>
Sent: Monday, October 01, 2001 7:11 PM
Subject: RE: [T2] Re: DP to SP conversion


> y
>
> On Mon, 1 Oct 2001, Stockton, Andrew wrote:
>
> > [...]
> >
> > I believe VW went to dual port to meet emission standards.
> >
> > Single port provides slightly higher low end torque because of the
> > higher velocity of the air fuel mixture as it enters the cylinders.
>
> I think that VW had to go to dual port to flow enough mixture after the
> displacement increase to 1600.  Keep in mind that the same basic head
> design had been used from 1200 through 1500, and there wasn't enough metal
> left to make the holes bigger.  Since they had to make a casting change
> anyway, they went all the way to the dual port design.
>
> > > Single port heads are not subject to
> all the cracking that you find > in dual port heads.
>
> I'm not sure that the cracking worries apply to the long-reach plug dual
> port heads.  Anybody have any data on the long-reach heads?
>
> > Single port provides more engine access especially when changing
> > number 1 and 3 spark plugs.
>
> Very true.  They also make it easier to seat the spark plug boots.  On
> dual port tin, you have to be careful to get the boots behind the manifold
> nuts.
>
> George Lyle
>
>
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