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
On Sep 10, 2009, at 1:06 AM, Oudesluys wrote:
> What strikes me is that a lot of people have changed their exhaust
> system for a more free flowing/louder set up and claim they have
> increased power. True/false? It feels faster because of the noise
> but in reallity hardly ever is, because neccessary alterations on
> the carb side are and probably ignition are ignored, not to mention
> the possibly neccessary changes in camshaft timing. These all need
> to be reset as the free flowing exhaust only will upset the overall
> balance in the engine settings.
> Just try to drive without exhaust system (free flow in extremis) and
> see what happens. It will seriously affect drivability.
> The so called improvement is often observed compared with a rotten
> exhaust in the first place.
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