<VV> Best 2-Carb Setup

[Sethracer at aol.com]

In a message JW writes:

I'm not  interested in fuel injection at this time. My goal is better 
low-end  performance while still retaining some high-end performance. I use the 
car for  city driving and would like to set it up for  autocrossing.


If this is going into a 912, and you have some interest in  Autocrossing, 
there are a number of things you could do to a pair of H or  HV series 
Rochesters to make them work better - for that task. You can move the  jets 
around, and add vent tubes. Boring the venturis out a little will help  the top 
end. If you do cap off the secondary holes - (Or machine off and  weld up the 
secondary holes to make the 140 engine appear as a stock 110 or 95  motor to 
tech inspectors - but who would do that?) you will need a bit more  Venturi 
area to retain much top end performance. If you keep the stock-flow  
Rochesters, the very bottom end, 1500-2500 RPM, will probably have a  little more 
torque. But the cam in that motor is better tuned for areas  above 2500RPM 
and the secondary carbs are there to let you explore it. Adding  the vent 
tubes and the relocation of the jets will allow you to raise your float  levels 
without fuel tip-over into the carb throat under cornering. The raised  
floats will prevent starvation. If the motor is apart, a little  head porting 
work under the carb mount won't hurt.
 
So - did you get enough suggestions?
 
-Seth Emerson