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RTR Upgrade
Part No:
Price Ex VAT @ 20%

Throttle improvement kit, consisting of 3 improved throttle rod assemblies, an overhead cross shaft and choke kit, which can be fitted to all cars fitted with 'CP' series TR5's, TR6's and early PI saloon throttle bodies. Please make sure you have ordered the correct kit.

There are two types of throttle body and we do a different kit for each. TR5-6CP can we identified by having one balance pipe connecting all three pairs sited outboard of the injectors and each throttle spindle operated by a separate push rod. TR6CR type has 2 balance tubes connecting all three pairs, one sited outboard of the injectors and a second close to the cylinder head with each pair of throttle bodies connected together.

This throttle system, which has single cable operation, has proved itself a major contributor to smooth running and maintainability of Lucas mechanical petrol injection systems. The kit includes a new overhead cross shaft mounted on sturdy pressed steel supports. By bringing the mechanism above the throttle bodies, space below is vacated so that high gas flow exhaust manifolds can be installed (the original under slung cross shaft would be in the way) and this new higher location keeps heat away from the mechanism as well as making access for adjustment easier. This upper cross shaft, which runs in 3 bearings made from a material superior to the original in as much as it is not affected by heat, grease or U.V. light, is connected to the throttle butterfly spindles by three independent ball jointed rods assemblies. These new rod assemblies have been designed to eliminate inlet butterfly 'flutter' by having spring loaded ball ends and are easily adjusted to greatly improve throttle balance as the kit sits above the throttle bodies rather than below.

Please note that many TR's have PI saloon car throttle bodies fitted some of which are subtly different to those fitted to TR's. We can supply alternative parts for these throttle bodies if necessary. Also, this kit has been compiled on the assumption that a standard throttle mechanism is being removed. If you have nothing other than the spindles in the throttle bodies, you will need a few extra components listed here which you can add to your order from the 'related products' list below.
6 x ¼" UNF attachment screws SH604061,
6 x Spring Washer WS104070643
6 x Plain washers WP10412057
1 x Choke cam follower screw 512288
1 x Locknut 512287
1 x Choke cable ferule BHH1059
1 x Choke cable trunnion AUE34

A simpler version of our improved throttle mechanism retaining the low slung cross shaft is also available. 
A full explanation of how our throttle kits work and the differences between them can be read in downloadable information sheet IS0007. See the  'Further reading' tab above

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