Buhk Exhaust Elbow

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Nigel Birch
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Buhk Exhaust Elbow

Post by Nigel Birch » Tue Mar 20, 2018 10:29 am

Having bought the bits (£31) and put it together I'm now wondering whether water might back flush into the manifold. Anyone else done this?
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Re: Buhk Exhaust Elbow

Post by Jolly Roger » Tue Mar 20, 2018 11:02 am

Nigel

It would depend exactly on the angle of the pipe. Gravity and exhaust flow should stop a back flush, but in a rolling sea this might not be enough.

Just a thought. Could you add a short extension piece to the bend? This would certainly help stop back flush.
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Re: Buhk Exhaust Elbow

Post by Nigel Birch » Tue Mar 20, 2018 5:08 pm

Having got the old one off there's nothing special going on inside. No baffles or anything. So I reckon the injection point is about in the same place.
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Re: Buhk Exhaust Elbow

Post by dj7613 » Tue Mar 20, 2018 6:33 pm

You can see the Nanni one from my Centaur here. https://www.westerly-owners.co.uk/weste ... itle=Nanni

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Re: Buhk Exhaust Elbow

Post by Nigel Birch » Tue Mar 20, 2018 7:25 pm

Nice colour....
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Re: Buhk Exhaust Elbow

Post by Nigel Birch » Wed Mar 21, 2018 10:42 am

So after all that the threads are subtly different so can't attach the 1.5" pipe to the bracket on the engine....mission aborted
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Re: Buhk Exhaust Elbow

Post by Jolly Roger » Wed Mar 21, 2018 12:57 pm

Could you get a new bracket made? Or a fitting given the correct thread? Both will cost only a small amount in an engineering shop, certainly less than a Buhk part.
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Re: Buhk Exhaust Elbow

Post by Nigel Birch » Wed Mar 21, 2018 4:49 pm

I could do Roger but I'm going back in on the 3rd of April so time running out. Decided on the safe but expensive route!
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Re: Buhk Exhaust Elbow

Post by Nigel Birch » Wed Mar 21, 2018 5:50 pm

Neil on PBO said:

"Yes - I have a home made exhaust elbow on my DV20. Constructed more or less as you show, except I have a 45 deg bend for the cooling water inlet. This gives a better angle for the pipework from the anti-syphon valve. I am on my second in 13 years - although the first was still OK when I replaced it. Never any trouble with water flooding the cylinders. The malleable iron bends have a tapered thread, I believe, whereas the exhaust flange fitting on the motor has straight threads. I just tightened them up as hard as I could with a smear of Boss-white."
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Re: Buhk Exhaust Elbow

Post by TyroSailor » Thu Mar 22, 2018 1:15 pm

Amazingly, when I took my engine to bits prior to getting it out, the exhaust elbow looked pristine. No idea why - it was painted the same as the rest of the engine, so was presumably 40 years old!
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Re: Buhk Exhaust Elbow

Post by Nigel Birch » Thu Mar 22, 2018 5:06 pm

Someone else on PBO has recommended Nero SS http://www.nero.co.uk/Catalogue/150LB-B ... d-Fittings

where you can get the parts to make up one of these:
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