Manifold set, one piece complete with throttle mechanism. Suitable for Post 1972 USA carb model TR6 and all TR5 and TR6 PI with wide ported head. For earlier narrow ported heads use RTR4008-1. See below
See also bracket RTR4054 cable support. This is required when cable operation is employed.
Gaskets are not included in this kit. Use a standard gasket for the head side, the kits are supplied with mountings for 45DCOE Webers. A separate set of the correct mountings will be required if 40DCOE carburettors are to be used.
This part is listed on the following pages of the website, where further information and background reading may be found.
Fuel and braking systems »
TRIPLE WEBER CONVERSION TR5-6
Information Sheets »
IS0037 - Weber Carburettors, Choosing the correct size
Q: Can I use an Extractor Manifold RTR2044 part of system RTR2042 with a triple Weber inlet manifold RTR4008 and RTR4008-1
A:
Our TR5-6 Extractor Manifold was designed to maximise gas flow specifically with PI inlet manifolds fitted.
These comments are specific to the Weber inlet manifold we supply but may be relevant to other manifolds as well.
Several things have conspired to result in a potential interference problem between the Weber inlet manifold we suply and our exhaust manifold.
1. Our
inlet manifold supplier used to supply TWM then switched to Cannon. TWM used to
fit but we are now aware the Cannon inlet manifold sits lower causing an interference problem with our extractor manifold. We believe the TWM (now not
available as far as we know) manifold was canted up at a steeper angle.
2. Our
Extractor manifold has recently been redesigned to improve access to the mounting
nuts and to optimise gas flow. We did this with the PI manifolds in place but having checked the Cannon inlet manifold there is an interference.
Our extractor manifold gives the best power of anything around, the long
primary outlets are crucial to this power delivery and we don't know of another Weber inlet manifold, so if you are proposing to fit these two parts together then we would suggest the following:-
1.The offending flanges on the inlet manifold can be filed away as much as
possible
2.It is permissible to plannish flats onto the tops of the exhaust tubes ever so
slightly.
It will be surprising how close this brings the exhaust to fitting. However
if this is not enough then the face of the inlet manifold which sits against
the head can be machined to an angle by a couple of degrees to tilt the outboard end of
the manifold up out of the way.
Q: How do I know if I have wide or narrow port cylinder head
A:
Only cars exported to the US had narrow port heads, these being fitted to TR250 and early TR6 both with the commission number prefix CC. It is the inlet ports that are different in this respect, the exhaust ports are the same throughout.
All TR5 and all TR6 other than CC prefixed cars have a wide spacing of the inlet ports. If you are considering changing your cylinder head, adding an extractor manifold or fitting a carburettor manifold, including Weber manifold it is essential to know which head you have.
To find out, measure between the inlet ports which are in 3 pairs.
CC cars: 17mm. The gasket usually has slightly larger diameter holes therefore the gap in the gasket will measure 15mm
CP, CF and CR cars: 25mm. The gasket usually has slightly larger diameter holes therefor the gap in the gasket will measure 23mm
Note: - Many TR's have engines and heads from saloon cars fitted so measuring is the only sure way.
