Trewey's DIY Side Exit Exhaust

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I wonder if they test the hearing on Vehicle Technicians wot do MOT tests.... this could explain it.

I thought, from something I read probably about 30 years ago, that having no back pressure in the exhaust reduces performance as the Inlet tract should be balanced with the Exhaust tract to create the best gas flow, and at least in a petrol engine an open exhaust burns the exhaust valves.

But it does look good Trewey, even with the bodge. :)

if the vehicle has a turbo all the back pressure it needs comes from the turbo, if you have back pressure after the turbo you will end up with the turbo not working to its full potential, also the turbo does a damn good impression of a silencer.


my cousins disco bobtail runs no silencing and thats not loud, sounds blurry lovely
 
I followed Trewey's design and fitted a side-exhaust to my Ninety at the weekend.

The end piece came from the local motor spares place and the finisher was made from a piece of ally sheet I had in the garage.
 

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word of warning (well not to much of a warning) flexible pipe starts to come apart after a while. its only really any good for temporary fixes. ive had a side exit exhaust for about a year, did it similar to how yours is but it has all unravelled so have had to get the bender out and fabricate a solid one. looks the same and actually sounds better
 
Trewey reckons his has got all noisy recently - maybe the flexi-pipe has started to come apart?

I'm not going to worry too much about mine until that happens - I considered welding up a joining piece between the front section and the elbow on the silencer but this was quicker.

Depending on how long the flexible bit lasts I'll either just replace it with the same again, or make up something more substantial.
 
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