See Jim Thompson's page on the subject.  It's gotta be ten years old by
now....
www.oldvolkshome.com/19to21.htm

Jim

----- Original Message -----
From: "Mike Collum" <collum@MYFAIRPOINT.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, April 06, 2009 1:20 PM
Subject: Re: 1.9 to 2.1 conversion question

> You can use the 2.1 throttle body and AFM with air filter connected to
> your Digijet wiring without modification.  The 2.1 air box won't fit the
> 1.9 OEM mounting because of the idle booster switch(s) (if you have air
> conditioning and/or power steering), and the 1.9 coolant hoses.
>
> I put a 2.1 into my '85 Westy and I used a complete 2.1 intake system
> ... from the snorkel in the D pillar all the way through to the intake
> runners.
>
> You'll want to use a Digijet (vacuum type) distributor as well as the
> Digijet ECU.
>
> Using the 2.1 exhaust, assuming it's in good shape, is a good idea.
>
> Mike
> '85 Westy (2.1)
>
>
> Brendan Slevin wrote:
>> So I acquired a free 2.1 that was rebuilt 30k ago to put in my 84.  I was
>> planning on doing the conversion the way I've read by basically putting
>> the
>> 1.9 WP/cooling pipes on, keeping the 2.1 plenum and using the 1.9 t-body.
>> What I didn't plan on was getting ALL the other bits for the 2.1, ECU,
>> harness, airbox, exhaust, etc.  Can I run the 2.1 ECU, t-body and airbox
>> and
>> such in place of the 1.9 bits?  I know I'll be putting on a new 1.9 WP
>> and
>> keeping the cooling system the same, and removing the 2.1 oil cooler.
>>
>> Brendan
>>
>>
>>