the 1.9 rockers are 9 MM threads the 2.1s are 10 MM threads
These both have 1.1to 1 rocker ratio.
The bug rockers have 8 MM threads and the same ratio.'
Each engine has a differant profile cam the 2.1 has the most lift at .366
intake
and 347 lift for the exhaust as measured at the valve stem
B Bob

----- Original Message -----
From: "Old Volks Home" <oldvolkshome@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, October 13, 2006 12:01 PM
Subject: Re: Rocker arm question

> Will they fit?  Probably.  Will they work?  Dunno, take a look:
>
> 025 109 405 C  Rocker Arm, 1.9
>
> 025 109 405 A  Rocker Arm, 2.1
>
> The visual differences are that the adjuster screws/nuts are different
> (larger on the 2.1).  If there's a difference in the geometry/ratio
> between
> the two, I couldn't say.  Boston Bob would surely know.
>
> All of the other pieces mounted to the rocker shaft assembly are the same
>
>
> On 10/13/06, roger sisler <rogersisler2000@yahoo.com> wrote:
>>
>> Will rocker arms from a 1.9 fit the 2.1 ?
>>
>> ---------------------------------
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>>
>
>
>
> --
> Jim Thompson
> 84 Westfalia 2.1 "Ole Putt"
> 73 K Ghia Coupe "Denise"
> 72 411 Station Wagon "Pug"
> oldvolkshome@gmail.com
> http://www.oldvolkshome.com
> **********************************
>