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Re: [Healeys] Exhaust system advice needed

To: "Eric (Rick) Wilkins" <e-wilkins@cox.net>
Subject: Re: [Healeys] Exhaust system advice needed
From: Oudesluys <coudesluijs@chello.nl>
Date: Sat, 12 Sep 2009 18:43:45 +0200
Clear answer: No. Mainly Fiat, Simca, VW, Volvo, Ford, Renault, 
Peugeot/Citroen engines
Kees Oudesluijs


Eric (Rick) Wilkins schreef:
> That totally makes sense.
>
> Being well versed in the mechanics at the high level, have you ever 
> dyno tested a simple exhaust "upgrade" on Healey?
>
> On Sep 11, 2009, at 1:27 AM, Oudesluys wrote:
>
>> If it is a properly designed freeflow exhaust you may. What I wanted 
>> to get accros is that the surface area of the exhaust opening being 
>> smaller than that of the carbs does not say anything. The speed of 
>> the exhaust gasses passing is a lot higher than on the carb side so 
>> you cannot compare. Similarly the exhaust valves are smaller than the 
>> inlet valves. A stock engine needs a certain amount of back pressure 
>> and resonance. If you reduce the back pressure to zilch it will not 
>> function properly without other mods to at least valve timing, 
>> carburation and ignition curve.
>> I have done enough tuning in my time on a dyno on many engines to 
>> have found out.
>> Kees Oudesluijs
>> NL
>>
>>
>> Eric (Rick) Wilkins schreef:
>>> I understand what you're getting at. The "what" is that 50 years 
>>> later we know that a Healey came from the factory with a fairly 
>>> restrictive exhaust system. We also know that by increasing flow, we 
>>> can gain a bit of added horsepower--without changing anything else.
>>> Sure, with newer cars being tuned pretty well from the factory, 
>>> gains from a simple exhaust "upgrade" are very limited. It's not 
>>> rocket surgery.
>>> Get a dyno, measure a stock spec Healey, and measure one with a 
>>> freeflow exhaust. I'd bet that you'd see an improvement.
>>>
>>> On Sep 10, 2009, at 1:53 PM, Oudesluys wrote:
>>>
>>>> Yes, so what?
>>>> Kees Oudesluijs
>>>> NL
>>>>
>>>>
>>>> Eric (Rick) Wilkins schreef:
>>>>> 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
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>>
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