Rear Exit Exhaust
Rear Exit Exhaust
Author
Discussion

jamesnormandale

Original Poster:

5 posts

182 months

Thursday 25th November 2010
quotequote all
A friend has told me about a rear exit exhaust system for Caterhams.

I am not keen on the common side exit exhaust system and was wondering whether the rear exit exhaust system exits out of the side panel or whether it runs underneath the car and does not exit out of the side panel.

If anyone has any photographs that would be great.

Cheers

James

allen l

443 posts

199 months

Thursday 25th November 2010
quotequote all
It runs underneath the car.

Nicodema

259 posts

239 months

Thursday 25th November 2010
quotequote all
Allen, you don't mean that the whole system run under the car do you? It's just the transfer pipe between the silencers.

Here are pics of the CSR 175 EU4 setup

No matter which way you cut it, you've pretty much got to have the exhaust emerging from the engine bay to one side or other, then the cat, then a silencer system. The rear exit is largely just to provide a second step of silencing. In the end someone's got to burn their legs. In a Levante, everyone does!biggrin

BDA

37 posts

192 months

Thursday 25th November 2010
quotequote all
James,
It depends what age/engine type of car you are refering to.

Cheers
Chris

CanAm

12,648 posts

293 months

Thursday 25th November 2010
quotequote all
That's why the left hand rear wing is shorter; the exhaust ran along the side of the car and then under the bottom of the rear wing and out the back.

Nicodema

259 posts

239 months

Friday 26th November 2010
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So were there some earlier models that didn't have any silencer down one side of the car? If so, did the pipe run along with the propshaft or somewhere else?

Tango7

692 posts

247 months

Friday 26th November 2010
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Canam's reference is to the Xflow cars with a rear exit exhaust. The exhaust still exited through the side skin and had a side mounted silencer (to ensure you burnt your leg!) but rather than have the angled final tail pipe, this was extended as a straight piece to come out from under the rear arch and be bolted to the chassis just in front of the fuel tank.

I do seem to recall seeing some exported sevens though where the exhaust went under the car and not through a side skin and joined with a rear mounted silencer. Maybe somethings for Swiss registered cars?

I reckon rear mounted systems are going to become more common as noise regs become more stringent for track days frown

Steve-B

903 posts

303 months

Saturday 27th November 2010
quotequote all
Oz Caterhams as supplied there locally for quite a while had rear exit exhausts as did a number of Se7enesque cars. Odd thing is they all seem to fall off to the nearside after their respective style of IVA there. See some old Lotus 7's with rear exhaust, and a couple in the USA.....just a straight pipe running alongside the tranny tunnel to a silencer in the rear...

BertBert

20,792 posts

232 months

Sunday 28th November 2010
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On my old R500, I had a rear exit zorst. It came out the side, did the 4-1 thing into the can, then ran along and under the wheel arch to the box mounted underneath the back.

Along with an airbox it made the car quiet enough for bedford. It lost 8bhp. On a comparative RR test, with the rear exit was 222, witht the standard side exit it was 229.

Bert

stowc

40 posts

254 months

Tuesday 30th November 2010
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How about this one on the Powerspeed site.

Green Caterham second and third row of photos.

Powerspeed

BertBert

20,792 posts

232 months

Tuesday 30th November 2010
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The Caterham supplied one is like that, but with an oval section silencer.
Bert

russelli

27 posts

191 months

Monday 6th December 2010
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made one for my HPC, http://picasaweb.google.com/kevrusselli/RearExhaus... it worked well for noise, tested static at cadwell 89 db, but had clearance issues with the 63mm pipe under the chassis,may re visit this in the future if there is a need. on the good old side exit again now around 95 db at 5000 rpm static at cadwell.