Exhaust for rear engined VW

asahartz · Post by **asahartz** » Sun Feb 01, 2009 12:27 pm

I have a VW T25 camper with a RV8 fitted, at the rear, obviously. The exhaust supplied with the conversion uses the original Rover downpipes and Y-piece running forwards before being mated to a Honda silencer box which exits in front of the rear wheel.

This arrangement is far from ideal, as it passes below several rubber water pipes and fuel lines, necessitating extensive heatshielding. It is also lower than the rest of the engine & gearbox, putting it at risk from speed humps.

My thinking is to use a simple arrangement running short pipes towards the outside of the van on each side to a silencer below each rear wing, so effectively two short separate exhausts. As I live fairly near to PD Gough, getting them made in stainless would be straightforward.

Any thoughts on this arrangement?

Ian Anderson · Post by **Ian Anderson** » Sun Feb 01, 2009 4:06 pm

LOUD!

Like over 100db at 2000rpm

I have on the GT40 tubular headers into 4 into1 into 2 silencers over the gearbox. All in stainless and it is loud like you would not believe..

So from me - keep the exhaust run as long as possible and avoid the stainless - it will be louder than mild steel by about 15 - 20 % Also if possible put in a balance bar between the 2 sides.

That said I believe the rear boxes from a 2l Cavalier can be put to good use if you have enough soace (one per side) fairly cheap and do a good bit to quieten the engine. (I did not have enough space)

Ian

asahartz · Post by **asahartz** » Sun Feb 01, 2009 5:46 pm

The existing exhaust is quite loud, but "V8-loud" - the original VW engine had an EMPI "quiet pack" and that was actually quite a bit louder!

Strangely enough though, I can hardly hear it inside the van - the V8 is much quieter than the wasserboxer was.

mgbv8 · Post by **mgbv8** » Sun Feb 01, 2009 7:04 pm

I use the cheap, flat oval turbo mufflers from Real Steel. They do a few configurations of inlet and outlet connections. About 20 quid a side for my twin system. And the MOT bloke says he's happy with them. Basically a Rover 4.6, RV8 style manifolds with collector outlets cut back so I have 2.5 inch pipes. About a foot of pipe after the 1st bend then straight into the cheap mufflers. Then 90 degree bend turned out under the sill just in front of the rear wheels.

topcatcustom · Post by **topcatcustom** » Sun Feb 01, 2009 8:57 pm

Fancy putting a couple more pics up of your car Perry? Want to see your side exit 'xausts!

TC

chodjinn · Post by **chodjinn** » Mon Feb 02, 2009 9:46 am

Perry's sound exactly like mine!! Mmmmm side exit goodness!

mgbv8 · Post by **mgbv8** » Mon Feb 02, 2009 11:36 am

Will have a look when I get home. I seem to have been the only person at work who has been listeneing to the weather forecasts and got up early to avoid jams.