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Thanks for your post McGuire The bushes are fully floating so they can't be steel backed. I had wondered about SAE 791 (Cu 88, Zn 4, Sn 4, PB 4)although this may not be sufficently score resistant for a gearbox application and perhaps a higher lead content is necessary.

Can anyone suggest the best type of bronze for the plain floating journal bearings on a gearbox layshaft, bearing in mind lubricity, embeddability and load? Thanks Jagman

Anyone know if there's any advantage in using a crossover on a twin pipe six cylinder exhaust? Aim is to reduce backpressure and increase cfm capacity. Engine uses two cast iron manifolds (3-1, not headers so the system is not tuned. Thanks Gus

I am hoping to repair the pitted gears on a steel camshaft by mig welding. The gears are hardened but I am not sure if by induction using a case hardening steel or by carburising and heat treating. Is it feasible to use Mig, bearing in mind that the gear is hardened? The drives are to...

David, One point which no-one seems to have mentioned is that the squish area needs to be above a critical percentage of piston area to make any difference. I can't remember the exact figures but I think its around 20%. Below this figure(whatever it is) squish does not create enough turbulence...