Definitive watercooled performance book/manual?

[onecogwonder]

This might be hiding on the site somewhere but I'm looking for a good resource for rebuilding my 2.1 motor over Xmas. I know the market is full of air cooled performance books but I can't seem to find what I need. The motor is OK so my build will be a reliability tune, mild head clean up and valve job, stainless exhaust and a slightly healthier cam aimed at better torque, any ideas anybody?

[toomanytoys]

nope, no book on the wbx...

In practice, type 1 theory works.... but the wbx has its own little foibles too...

[syncropaddy]

I remember something produced by an American company called Bugpack that was predominately Aircooled but did deal with the WBX water cooled units. Google it and see what you get

[HarryMann]

stainless exhaust and a slightly healthier cam aimed at better torque

Ok, well I imagine you meant - what exhaust designs are aimed at performance (as opposed to corrosion prevention)

This might be useful: from Simon Holloway's Syncro Story

One of the “extra’s” already fitted on my van was an “Autocavan Powertorque” exhaust system. This was a tuned exhaust with stainless expansion bellows, which went into an Aircooled 2 litre type Stainless Steel Silencer with single outlet. It has a bigger bore manifold (38mm instead of 36mm) & is a very neat set up, which has always given the vehicle a bit more power (and a very nice sound!). Over the years I have had to patch it up a few times & sleeve the bellows sections as they eroded away. This was becoming a bit of a problem as the mild steel flanges on the system also eroded away. After two pipes broke completely at last years Vanfest (You might have heard it whilst I was doing the “Big Split”!) I decided that it was time for a new system. Getting a new silencer was not a problem as I found that the exact same profile box is still made & sold by “Waggonworks”. The original arrangement came with a very substantial saddle & clamp arrangement to hold & support the silencer box. This means that there is a lot less stress put on the head exhaust studs & also it allows you to hang the exhaust properly so it does’ not droop. I have seen many of these exhausts on Aircooled vans that look very lopsided.

Unfortunately, It is not still possible to get the original tuned manifold that will fit on a 2.1, or the saddle/clamp arrangement. (In fact I have never seen a similar arrangement to mine on any watercooled T25).

Rather than different profiled cams, the norm with these engines I believe (other than never tune them ) is to have 'ratio rockers' - that is increase the valve lift by a higher rocker ratio

[syncropaddy]

Somewhere on a backup drive I have a picture of that Autocavan Powertorque system.

[Paul C]

Here you go - I've used these guys for Aircooled parts - top quality and they know their stuff not cheap tho

http://www.ahnendorp.com/VW-waterboxed- ... machining/