[Healeys] Exhaust system advice needed

[Eric (Rick) Wilkins]

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.