Welcome to our resource for MG Car Information.



TR parts and Triumph parts, TR bits, Triumph Car Spares and accessories are available for TR2, TR3, TR3A, TR4, TR4A, TR5, TR6, TR7, TR8, Spitfire and Stag and other TR models are available from British car spares and parts company LBCarCo.

Triumph Spitfire - Rocker Arm Ratio

Can anyone tell me the rocker arm ratio of a Spitfire 1147 cc engine; and/or the camshaft lobe lift (not the valve lift) of an A6 grind cam?
Randall Howard

I think it's 1.48:1, but see:
Article by Chris Correlli on Performance Tuning,
or go to their own site:

John D

In case anyone is interested, I'm quite sure that the rocker arm ratio for a 1147 cc Spitfire is 1.45:1. The 1.48:1 ratio may be correct for a GT-6; and the 1296 & 1500 Spitfires may not be the same as the 1147 - but, after doing some measuring and calculating, it appears to me that the ratio for the 1147 engine is 1.45:1.
Randall Howard

This thread was discussed between 01/12/2000 and 09/01/2001

Triumph Spitfire index