1600 Twin Port Manifolds and Front Disc Brakes

[GOM68]

Right guys I am totally confused and need some guidance/help!

I have dropped the engine from my 71 so that I could give it a once over as well as strip out the old exhaust system and switch to the dual Kadrons that I bought and am slightly confused about a couple of things which I have listed below.

1. The first thing that I have noticed is that the right hand manifold, (sits between 1&2) has a recess for a nipple that is located between the two ports which I presume helps as a locator? However there is not one one the left hand side, is this normal/right? The new gaskets, non metal type that I bought do not have a hole in them for this nipple thing, so is it a case of just poking a hole in the gasket and drill a locator hole in the Kadron manifold?

2. My bus has disc brakes up front and I was under the impression that there is suppose to be some sort of vacuum type set up that feeds from the manifolds to the brake servo, is this correct? The standard manifolds that I have taken off do not have any sort of outlet for connecting pipe work, the Kadrons do have an outlet which at the moment are blocked off. Is it necessary to have the brakes connected up to the manifold and can anyone point me in the direction of a good website that details how it works and how it should all be connected together?

Many thanks in advance.

GOM

 

[jonboylaw]

Check you actually have a servo first. My 71 is not fitted with one.

It sounds like you have different heads left and right. You could try sourcing one without the locating dowel. I'll let the other guys comment though.


Jon


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[RednWhite]

The head with the locating dowel for the manifold is a '71-'73 dual port head (see page 49 of 'How to build your Volkswagen aircooled engine' by Tom Wilson). If you take off the rocker covers on both head you'll be able to find a reference number for the head (something like 113 101 375A). Note both numbers and google them to see what you have. While its not normally a huge deal, I'd be concerned if the heads had different combustion chamber sizes and therefore different compression ratios.

The servo (if you have one) is normally connected to a T piece off the balance tube between the two Kadrons. The connection on the manifold is for your distributor vacuum takeoff. On an original setup, the servo connection would have been off the central manifold rather than one of the ones at the cylinder head.

VW Heritage have a gasket with a cutout for the dowel:

http://www.vwheritage.com/vw_spares_Inlet-Manifold-Gasket-Twin-port-Manifold-to-head-113129717A_act_shop.product_pID_52006_lang_EN_country_GB.htm?crumbStartPage=2&crumbStartRow=28" onclick="window.open(this.href);return false;

I wouldn't drill the Kadron manifold - I'd remove that dowel (its just a stud so two nuts tightened against each other will allow you to remove it. Maybe use a bit of penetrating fluid first to avoid cracks)