Rochester Tune-Up Tips - 06/23/11 02:08 PM
I sat down at the bench last night and carefully went through Pat Smith's "Improving Driveability With: Multiple Rochesters". I just installed two BC Rochesters on an Offenhauser intake and will be doing the final tuning this weekend.
The article is great and by carefully going through Pat's instructions I learned a lot and besides that it was great fun.
I have a few questions
In step # 10 I worked out a small aluminum plug to get access to a tube inside the throat of the carb.
My question is once I've done the road tests and made sure passage size is optimal for my car "should I re-install the aluminum plug?"
Now that the lead plug has been removed should I close the hole in the exterior of the carb body with a short screw, or?
I've been told another approach to deal with the reduced vacumm caused by using two carbs is to shorten the power valve piston spring (Fig B, part f) by 1 1/2 coils after assuring that both springs are of the same length. Is this an alternative to optimizing perfromance and dealing with the hesitation at acceleration?
Thanks so much for your comments and special thanks to Pat Smith for sharing his expertise!
Ted
The article is great and by carefully going through Pat's instructions I learned a lot and besides that it was great fun.
I have a few questions
In step # 10 I worked out a small aluminum plug to get access to a tube inside the throat of the carb.
My question is once I've done the road tests and made sure passage size is optimal for my car "should I re-install the aluminum plug?"
Now that the lead plug has been removed should I close the hole in the exterior of the carb body with a short screw, or?
I've been told another approach to deal with the reduced vacumm caused by using two carbs is to shorten the power valve piston spring (Fig B, part f) by 1 1/2 coils after assuring that both springs are of the same length. Is this an alternative to optimizing perfromance and dealing with the hesitation at acceleration?
Thanks so much for your comments and special thanks to Pat Smith for sharing his expertise!
Ted