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Home  »  Engine, Transmission, wheels/Tyres and Heating/Cooling  »  ENGINES and COMPONENTS  »  ROCKER ASSEMBLIES  »  ROLLER ROCKER SETS  »  ROLLER ROCKER SET NP TR2-4A HIGH RATIO

ROLLER ROCKER SET NP TR2-4A HIGH RATIO

RTR Upgrade
Part No:
RTR1195-1.65K
Price
£1124.08
Price Ex VAT @ 20%
£936.73

CURRENTLY UNAVAILABLE

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TR2-4A roller rocker set. 1.65:1 ratio. Produced from aircraft specification aluminium. This kit includes a new shaft and 8 roller rockers, which you build into a rocker assembly using your existing pedestals and springs/spacers.

No other modifications are required with the exception of the rocker cover. It will be necessary to use an aluminium rocker cover of the RTR1098 series or RTR1099 series as the rockers foul the standard tin cover.
Benefits include reduced value gear wear and less power loss as a result of low friction and more rigid construction. This kit increases the ratio to 1.65:1 giving 6% extra lift. Kit part number RTR1195-1.55K retains the standard rocker ratio of 1.55:1. When coupled with a few other modifications, such as exhaust system RTR2074K and possibly a gas flowed head, the extra lift provided by this 1.65:1 kit will give a noticeable power increase, without the need to install a longer duration camshaft or increase the compression ratio. When a high lift camshaft is to be installed, use the 1.55:1 ratio kit, to avoid valve contact with pistons.
Two new mills pins 058334 will be needed to secure the end caps
Note: If you cannot use the existing pedestals for some reason, order second hand parts 112545SH (1 off) and 112546SH (3 off) or a new set 112545X.
We also have sets available which are complete with billet machined aluminium pedestals incorporating rocker end supports RTR1195-1.55-1K and RTR1195-1.65-1K. These kits do not require you to use any of the old components. See below

GENERAL INFORMATION
There are two types of roller rocker sets, varying only in the ratio between camshaft lift and the resultant valve lift. The standard ratio for a Triumph TR2-4A and TR250, 5, 6 is 1.55:1 meaning that for every 1mm of camshaft lift, the valve will move 1.55mm.
1.55 :1 ratio is the standard ratio and will change nothing with respect to the engine set up but offers less resistance in the valve train bringing longer life to the affected components and to a very small extent increased power due to less resistance for the engine to overcome.
1.65:1 ratio increases the lift from the same cam, offers the same benefits and the 1.55:1 set and can increase the performance but this by no means certain as the condition of the engine and the components in it will affect this. Also, the extra lift has to be accommodated by the components in the valve train. A competent mechanic needs to check that the valve springs will not become coil bound, the rocker geometry is adjusted, the push are the right length and that there are no interferences between components.
After all this has proved satisfactory the engine will need re-tuning on a rolling road for best results.
Revington TR can undertake this work on their 400hp rolling road.

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