I am thinking of changing my cattd stainless silencer for something like an R1 carbon can.

Currently the silencer is in the "normal" position, i.e. alongside the cockpit, but it struck me that a smaller can would probably fit along the angled side of the engine bay - advantage would obviously be that passengers are less likely to be burned on entry/exit . Also, a bit less pipework will weigh less...

Assuming that the can doesn't stick out beyond the outside edge of the wheels, is there any reason why this might not be a good idea? The only thing I could think of is that the exhaust will exit in front of the cockpit so fumes could blast the occupants, but I am pretty sure I have seen pics of a BEC (Toniq?) with the whole can inside the engine bay and just the end pipe poking through the side. Also, I would have thought that the fumes are more likely to blow backwards, rather than up.

Thoughts anyone?

I would be concerned with the length of the pipes if you move the silencer closer to the engine. Exhaust gas scavenging can play a major part in performance, so too short a length could impact that. Best bet, find a book on exhast design (or the forula for primary legnth) and work out the optimum length for your application.

amazing!!

I was thinking the exact same thing this morning for my 1.8 K series.
I'm as interested as you in peoples thoughts on the subject.

A lotus elise has short pipes due to the mid engined layout. I could measure them on my elise and let you know as a guide to minimum length.

[Edited on 2/11/07 by Hammerhead]

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Originally posted by Hammerhead
amazing!!

I was thinking the exact same thing this morning for my 1.8 K series.
I'm as interested as you in peoples thoughts on the subject.

A lotus elise has short pipes due to the mid engined layout. I could measure them on my elise and let you know as a guide to minimum length.

[Edited on 2/11/07 by Hammerhead]

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Calvins car also had the exhaust all under the engine with just a rolled lip protruding. I think he's withdrawn all his pictures though.

calvinx's car also had buggered body work near the exit as well.

Yea I bet it would play hell with the gel goat and all them carbon deposits would't be great

RE: The Elise exhaust

Upgraded manifolds usually lengthen the primaries right under the engine.

The exhaust goes through a CAT, turns 180deg, through the silencer, then 180 and another 90 to get out the back. So in total its probably longer than a typical 7 system.

I tried an exhaust with a silencer where the CAT normally is which just exited downwards after. Only problem with it was the noise so I went back to the factory layout in the end.

340r rear

You are right probably is longer than a seven as headers are closer to the front of the car and the bends create more length (see 340r pic).

cheers

Hi All

A couple of points....


If a packed can were to be used it would get hotter and possibly burn the packing quicker.


Shorter runs tend to give a higher note.
I'm a lover of the deep throaty growl myself.


Atb
Paul G

Apart from the scavenging aspect you will probably find that shorter headers will make the exhaust note louder and more 'waspy'.
I recently extended my tail pipe (courtesy of 907) by 500mm to a central exit and the sound got much deeper as a result.

A bit like a musical instrument really - the longer the tube, the deeper the sound.

LOL - talk of the devil Paul

[Edited on 2-11-07 by RazMan]

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Originally posted by Hammerhead
A lotus elise has short pipes due to the mid engined layout.

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quote:

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Originally posted by RazMan


LOL - talk of the devil Paul

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