[Healeys] IS Bigger exhaust better

[Editorgary at aol.com]

In a message dated 9/10/09 11:08:18 AM, healeys-request at autox.team.net 
writes:


> 
> I'm pretty sure that in the case of a factory Healey, the added flow
> is going to give an increase in performance as the stock system--BN4-
> BJ7--is smaller than the opening allowed by the carbs.
> 
> Wilko
> 
The only way to tell (and the only way to be sure) is to 
measure/tune/re-measure the car on a chassis dyno ("rolling road" to our European friends). My 
bet is you'd get a few horsepower just by checking how your timing advance 
and carb tuning is set, and then with the bigger exhaust you're bound to get 
a few extra hp past that, just because the system was originally 
exhaust-constricted.
But there's no substitute for dyno tuning when making significant changes 
to intake, ignition, or exhaust.

Best
Gary