Healeys with close to standard specification and normal rev. range you
would expect perform due to the wide torque spread. If torque production
and figures are not increased horsepower can only be increased with
higher revs. Most Healeys on the road will perform better with a full
length exhaust system as this provides Healeys with better torque. Works
Healeys do not have any significant increase in inlet or exhaust port
size. Free flow headers will increase performance if they are not
excessively oversize. The standard 2 pipes in and 2 pipes out with early
six silencers are straight through without internal baffles and the tail
pipes are of a clean low restriction design. The relatively small
diameter aids gas velocity and therefore cylinder exhausting and better
fuel/air fill resulting in more power if all other factors are at their
optimum.
In my opion the rally cars were only fitted with side exhaust for ground
clearance benefits. I know there are far more powerfull Healeys than
works cars these days but these cars will have quite radical internals
and use far higher revs.
Roger Menadue always said the horsepower figure was relatively
unimportant. He had his own hill with marker points and tuned his works
cars to achieve the shortest time over that distance. The best result
came from the combination of torque:revs:horsepower and suitable gear
ratios to optimise the best useable rev range for the longest duration.
Thats why Healeys had overdrive, to fill the gaps in the gear ratios.
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