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Dave
Many thanks - I have never had a problem with the 'box but my single seater driving colleagues have tried to "drive it like a hewland" and I reckon its this that has caused the problems!!!
The calipers have now been rebuilt by an AP pecialist in Bromsgrove so I am very hopeful that has cured the problem (cooked seals & a damaged piston were found). The engine delivered 207 Bhp on a RR at the start of the year - standard valves, standard lift/ long duration cam & a CR of about 11.5:1. It has forged pistons but standard rods & crank. The refresh will see the valve seats re-ground and maybe a new cam.
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