<<<snip>>>
Heck - the special tuning option for the MGA was
to use a Riley 1.5 cam with LESS duration, sacrificing a few horsepower
at
redline for a better midrange, which is where you would be most of the
time.
<<<snip>>>
The exact same thing is true of the XPAG engine. There is a 3/4 cam and
a full race. The 3/4 cam provided more power ABOVE 5000 RPM, and the
full race was just that. The full race absolutely needed headers, and
the 3/4 worked better with them also. For a street machine the
recommendation by MG was the cam used in the late TD and TF as it gave
more torque and power at 4000 RPM: normal cruising speed for the
original axle ratio.
Many people are aways reducing the engine RPM by fitting lower
numerically gear ratios. The purpose being to reduce the buzziness of
the engine. Fitting a 3/4 or fancier cam makes the engine less
tractable as the cam is only good at the very top end. So, if you're
considering changing the rear axle ratio to make the engine run slower,
you don't want a cam that's only good at the very top end RPM
Blake
/// or try http://www.team.net/cgi-bin/majorcool
/// Archives at http://www.team.net/archive
|