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  #31 (permalink)  
Old 09-23-2005, 08:16 PM
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Originally Posted by Rick WI
Of course you want back pressure. That way you keep more of the burned combustion in the chamber to dillute the fresh fuel/air mixture and are able to benefit from the latent heat of evaporation from that hot exhaust. NOT
Hey, that sounds like a good idea, what should we call it...
Hmmmm... How about Exhaust Gas Recirculation...

Originally Posted by Rick WI
Header science, which I am no expert in and leave that to Stahl, Burns and and others, is not the same as exhaust science. The tuned length, diameter, collector shape and style will have MUCH more impact over how much power the engine makes than what size exhaust you stick behind it, unless it is WAY too small.
True enough, however, (elephant sized "BUT" coming up)
If you read up on tri-y-headers, you'll find that they make
more HP/Torque in the midrange, without any sacrifices in
the bottom or top end. And the midrange IS the place where
a well screwed together hotrod is going to spend most of
the time...

Originally Posted by Rick WI
you modify the exhaust system you have to tune the carb, simple as that. That's the reason one application will run better than the other, re: Harley and Toyota (EFI in that case). End of story.

If you want to run a 3" duals and it makes you happy, do it. It's noisy (I know I run one on the street) but it's your car and you should enjoy it the way you want.
Yep, if it is going to breathe easier, it better be able to
inhale what it needs as well...

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  #32 (permalink)  
Old 09-26-2005, 03:27 PM
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OK, I did my homework. The article I am refering to is in HOTROD October 2000, there is also a good article in the current issue of Super Chevy. If anyone wants I can talk to the Exhaust design guys here and get their two cents. I think we have covered all the issues but if not let me know. I can also dig up one of my fluid dynamics papers and retrack my stuff.

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