[Roadsters] Head Porting

[Paul]

  Not sure what motor he started with, but it might be tough to keep a
'stroked' motor together at 8000 rpms.  Think piston speed.

Paul
Ohio

--------------------------------
A longer duration cam will lower the effective compression ratio. I think I

might have milled the head a bit to pick the compression back up into the  
premimum range. Also, torque is generated by combustion chamber pressure, HP
is  
generated by RPM. You can increase chamber pressure to increase torque and 
bump  HP some but the real HP increase comes from higher RPM. Rather than
the 
stock  6000 RPM, build the engine to do 8000 RPM. With no increase in
chamber 
pressure  you will pick up 1/3 more HP. This sounds simple however there is
a lot 
that  goes into moving the peak of the torque curve from 6000 to 8000. Cam, 
port  sizes, balancing, strong rods, oiling and on and on. If you do the
port 
and cam  to peak at 8000 rpm then only run to 6000 rpm you have wasted a lot
of 
time and  money. You will see some gains but not nearly what you could.
 
Enough rambling for early in the morning.
 
keith