Joined: Aug 2019 Posts: 70 Threads: 1
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Location: Nottinghamshire
Car type: 1929 AD Tourer
Thanks Ruairidh. I will try again in the coming days.
Yes, I believe the short tail pipe should point inwards, and I've seen period pictures showing exactly that. The one on our chummy has always pointed outwards though, but where this came from is lost to the mists of time.
Joined: Nov 2017 Posts: 210 Threads: 5
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The original swb silencer box incorporated the tailpipe, which faced downwards and inwards.
Virtually all aftermarket boxes were sold separately to a tailpipe, which could be fashioned in whatever way you preferred, and it seems to have become the accepted norm over the years to have it exiting at right angles, in front of the nearside rear wheel.
Joined: Aug 2019 Posts: 70 Threads: 1
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Location: Nottinghamshire
Car type: 1929 AD Tourer
Interesting! Thanks for that.
Joined: Aug 2017 Posts: 2,602 Threads: 33
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Location: Deepest Frogland 30960
Car type: 1933 RP Standard(ish) Saloon
From a safety aspect it's better to have the end of the tailpipe ouside of the vehicle, whichever format you're using, so as to avoid the possibility of exhaust fumes being drawn back into the vehicle.
Joined: Aug 2019 Posts: 70 Threads: 1
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Location: Nottinghamshire
Car type: 1929 AD Tourer
11-06-2025, 04:51 PM
(This post was last modified: 11-06-2025, 04:55 PM by John H.)
Well, after two weeks of trying, I eventually managed to get through to Seven Workshop and ordered a complete SWB exhaust, complete with front down pipe. It all arrived today. However, it doesn't fit! The silencer is not a million miles out, but will need the front bracket altering to make it fit the chassis. I'm not too worried about this though. However, the front down pipe is no good at all. The pipe is too long between the manifold flange and the first bend, so it badly fouls on the curved flitch plate (side of engine bay). This pipe will need a fair bit of cutting, welding and re-shaping to make it fit. I can't use the car's original down pipe either, as this enters the silencer at an angle, as per the Austin parts book, whereas as the Seven Workshop silencer has the inlet pipe in a straight line with the silencer body. Bear in mind this car (a 1929 AD chummy, coil engine) is very original, still has its original engine etc. and hasn't been "mucked about with". So the car itself is not to blame here. Anyway, the upshot is I'm no further forward on this. I can now see where my late father's frustrations came from - he struggled to get anything "off the shelf" to fit. Hmm!
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If your original downpipe is useable the easiest modification would be to the inlet pipe of the new silencer. One cut and a weld to the inlet pipe to match its angle to your down pipe. A lot of bits need a bit of work as many changes were made over the years of production and it is not practical for suppliers to stock every variation and keep costs down. A7 owners are very lucky that we have such a good supply of spare parts.
Joined: Aug 2019 Posts: 70 Threads: 1
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Location: Nottinghamshire
Car type: 1929 AD Tourer
Bruce, I can feel a presence, looking over my shoulder, wagging a telling finger! He's been here before of course.
Dave, to be clear, I am indeed very grateful that these items are available, but nevertheless disappointed that they don't fit what was a very common, popular model. It's not as if the AD tourer is a rare or unusual variant. Far from it. Whatever, the silencer is not the problem. The down pipe is the problem, and having paid good money for it, I'm going to bite the bullet and modify it to make it fit. I probably could modify the silencer to fit the old down-pipe but that would be two wrongs making a right, and would mean the new down-pipe was a waste of money, so I'm not going down that route. Ideally, I wanted a simple hassle-free solution, but so much for that! Grrr!
