HoSS 126 Posted January 28 Share Posted January 28 Does anyone know the C&U regs or MOT for where and exhaust must be routed? I'm looking for a different route and making up a custom exhaust. e.g where it comes out on the body? how long the tubes can be after the final silencer.... Quote Link to post Share on other sites
mickeyw 182 Posted January 28 Share Posted January 28 I've never heard of the MOT being too fussy. As long as what you have is intact and not excessively noisy. I've seen many 90s with the hateful side exit just ahead of the rear wheel, and plenty more with it high up aft of the rear wheel. My personal feeling is that the exhaust pipe shouldn't be directed straight at pedestrians, so at least pointing it downward if a side exit would be more sociable. Quote Link to post Share on other sites
mad_pete 184 Posted January 28 Share Posted January 28 I think as long as it’s not dangerous. Throwing exhaust into the car or directly at pedestrians and there aren’t hot bits exposed for kids to touch and it’s not too loud you are good. Quote Link to post Share on other sites
HoSS 126 Posted January 28 Author Share Posted January 28 Thats encouraging, i can route it non-pavement side, but ideally i wanted to bring it out between the 2 rear axles. Then i was also wondering if it must behind the passenger compartment to avoid fumes being drawn in... Quote Link to post Share on other sites
missingsid 171 Posted January 28 Share Posted January 28 Front exit exhausts exist or used to. The silencer and exit were in front of the front wheel. Quote Link to post Share on other sites
mickeyw 182 Posted January 28 Share Posted January 28 16 minutes ago, HoSS said: but ideally i wanted to bring it out between the 2 rear axles. Oh FFS, you go saying things like that, and I end up diving off at a tangent to see what you're building. I'm guessing this must be Volvo related? Quote Link to post Share on other sites
mickeyw 182 Posted January 28 Share Posted January 28 2 minutes ago, missingsid said: Front exit exhausts exist or used to. The silencer and exit were in front of the front wheel. I seem to remember many HGVs of 70s era, and probably before, had a big silencer with the pipe shooting sideways right at the front. Quote Link to post Share on other sites
Nonimouse 243 Posted January 28 Share Posted January 28 57 minutes ago, HoSS said: Thats encouraging, i can route it non-pavement side, but ideally i wanted to bring it out between the 2 rear axles. Then i was also wondering if it must behind the passenger compartment to avoid fumes being drawn in... Isn't that how the Pinz 6x6 is set up? We have had no issues with any of the G wagen re-builds having a side exit in front of the rear wheel. Both DVSA and MoT have been okay. Essentially big, long silencer with short 3" exit. The 606 sounds gorgeous, especially under load 1 Quote Link to post Share on other sites
Stellaghost 742 Posted January 28 Share Posted January 28 My wife's Ford ranger exhaust stays under the car and points downwards before it gets to the back axle, mot man has to get on his knees to reach under for emissions test we certainly don't have any issues with it there regards Stephen Quote Link to post Share on other sites
dangerous doug 95 Posted January 28 Share Posted January 28 I remember somewhere that it must exit behind the rearmost opening window Quote Link to post Share on other sites
Bowie69 1,607 Posted January 28 Share Posted January 28 Merc SLR has it just behind the front wheel! So... Not 100% sure about that... Quote Link to post Share on other sites
western 964 Posted January 28 Share Posted January 28 4 hours ago, mickeyw said: I seem to remember many HGVs of 70s era, and probably before, had a big silencer with the pipe shooting sideways right at the front. On fuel tankers the exhaust must be away from the load & valves on the body/trailer, lots have exhaust mounted in front of the front axle & exiting towards the centre of the road. & have a heatshield/fire shield between cab/engine & tank body. Most 90/110/Defenders have the tail pipe on left but going rearwards & slightly left, but doesn't exit directly on to pavements/pedestrians. https://www.legislation.gov.uk/uksi/1986/1078/regulation/61/made nothing here says where or which direction the tail pipe should be directed. Quote Link to post Share on other sites
biffer4240 2 Posted February 7 Share Posted February 7 On 1/28/2021 at 11:36 AM, HoSS said: Does anyone know the C&U regs or MOT for where and exhaust must be routed? I'm looking for a different route and making up a custom exhaust. e.g where it comes out on the body? how long the tubes can be after the final silencer.... as an ex mot inspector the area is very grey according to the book that we follow it say no louder than a similar type of vehicle has no leaks and is fixed properly to the vehicle and away from fuel and brake lines and it does not endanger public with fumes ect then there is not reason to fail it how ever just be aware if its was fitted with a cat that must be fitted a lot of the mot test is down to descretion of the tester hope this helps Quote Link to post Share on other sites
HoSS 126 Posted February 8 Author Share Posted February 8 I was wondering if the exit can be underneath between the chassis rails, pointing down, between the 2/3 axles... Quote Link to post Share on other sites
Blanco 170 Posted February 8 Share Posted February 8 I had an exhaust leak once (1992 RR) just behind the rear axle, it was fine most of the time, in fact I had no idea it was there until I hitched up the horse box one day. The altered air flow created a dead space underneath which gathered the fumes, eventually coming into car enough to notice, it also created a hotspot that melted the insulation on the fuel pump loom which is what really got my attention! I would be naturally nervous I think of any exhaust terminating under the vehicle?? Quote Link to post Share on other sites
HoSS 126 Posted February 8 Author Share Posted February 8 In my case that will be under the camper body which will not be occupied when driving, so fumes not an issue. But i wondered if that contravened any MOT or C&U rules? Quote Link to post Share on other sites
simonr 334 Posted February 8 Share Posted February 8 1 hour ago, HoSS said: In my case that will be under the camper body which will not be occupied when driving, so fumes not an issue. But i wondered if that contravened any MOT or C&U rules? I think - it depends! Most Vans exit the exhaust in the middle, behind the cab - but I guess are tested to make sure exhaust does not enter the cab or loadspace. Quote Link to post Share on other sites
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