In a message dated 9/10/09 11:08:18 AM, healeys-request@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
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