Anyone understand advanced exhaust gas dynamics???

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Are there any techies here as got a few Q's on exhaust design and understanding the effects of changes...

plus....

Is any one aware of a PH'er who could give advice on aerodynamics re a roof design.

Cheers

Skid

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Cheers Deltaf.



Skid

[skid]

Crikey!

Thanks for the deatiled response! Think I will have to get my thinking hat on.

FYI I'm trying to get the best out of an existing design by playing around with the perforated tube by varying the length perforated/non perforated and removing the insulation.

Cheers
M

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greenv8s said:

Hang on, it sounds as if you may be talking about silencer design but I think Matt is talking about tuning the primaries. Perhaps you should outline the problem you are trying to solve?

Yes you are right.

System is in place. SBC 350 with 1.75" primaries to side pipes. There is no balance pipe between each side.
The Primaries are of unequal length as on an AC Cobra rep and space restricted. Average Primary lenght circa 24". These collect each side into a 3" perforated tube in a 5" casing which is about 36" long.

Not worried about the noise but was wondering what the effect of replacing the perforated tube, or sleeving a portion of it.

The engine/carb has been set up in situ and wanted to know what potential gain/loss/effect could be achieved by doing this.

Would it effect back pressure and need rebalancing?

Cheers Guys.

M

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Cheers Guys.

The Black art still confuses me. Never mind.

I read before some David Vizzard articles about pipes and header diameters. Smaller pipes can help but I think they need to exit to a bigger chamber.

I got confused when he started to explain the swollen pipes seen on 2 stroke bikes but I got the jist.

Anyway, does any one know if sleeving the perforated tubes in the side pipes will be detrimental and in which way????