[T3] oil pump size

[Jim Adney]

On 20 Mar 2012 at 22:48, Keith Park wrote:

> I was just looking thru my Bentley, and it says that the later engines
> with the dished camshafts Had "Larger" oil pumps than the earlier flat
> cam's used. 
> 
> I know these days they are using the flat cams with the matching pumps
> and saying that the oil Pump is the same size. is that true? Do the
> dished cams use "larger" pumps? 

I believe the latest stock size pump for the flat cam was 21 mm. The 
dished cam engines came with 26 mm pumps. Unless something has 
changed in the last few years, the "normal" oversize aftermarket 
pumps were 25 mm. Larger pumps, like maybe 30 mm, have been made, but 
they won't clear the Type 3 fan housing.

Lots of people think the 25s and 26s are the same. The difference is 
probably insignificant, but it's not quite zero. The OE 26 mm pump 
has the advantage that it has somewhat longer support for the pump 
input shaft, which is critical for longevity.

Can we still buy dished cams and the OE style pumps to work with 
them?


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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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