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Old 12-06-2020, 21:10   #1
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MD2020 High Rise Exhaust Elbow

Trying to help some friends.

Looking for a MD2020 high rise exhaust elbow. You can find the standard low rise, even in cast stainless, easy. The high rise is like looking for unicorns.

Is using a brass plumbing spring loaded check valve in the exhaust hose a viable option ?
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Old 12-06-2020, 23:19   #2
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Re: MD2020 High Rise Exhaust Elbow

Quote:
Originally Posted by theoldwizard1 View Post
Trying to help some friends.

Looking for a MD2020 high rise exhaust elbow. You can find the standard low rise, even in cast stainless, easy. The high rise is like looking for unicorns.

Is using a brass plumbing spring loaded check valve in the exhaust hose a viable option ?
Are you telling us there is such a thing off-the-shelf?

I had a quick look and I can't find a high rise one

https://www.google.com/search?q=MD20...5jZ3pEaHdg7hM:

For the price they want for a standard elbow maybe you should consider fabricating one out of stainless?

I definitely wouldn't consider a brass plumbing spring loaded check valve.
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Old 13-06-2020, 03:16   #3
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Re: MD2020 High Rise Exhaust Elbow

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Are you telling us there is such a thing off-the-shelf?
I am saying this is what is on the engine RIGHT NOW !

Quote:
Originally Posted by coopec43 View Post
For the price they want for a standard elbow maybe you should consider fabricating one out of stainless?
One UNSUCCESSFUL attempt was made. The two hole leading into the elbow did not line up.
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Old 13-06-2020, 04:19   #4
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Re: MD2020 High Rise Exhaust Elbow

VP makes a bronze high rise exhaust elbow for the D1-20 engine that will bolt on to the MD 2020 manifold, but the water hook up is not exact, and will require some adapting.

Might be worth looking into. VP part # 3884165
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Old 13-06-2020, 04:40   #5
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Re: MD2020 High Rise Exhaust Elbow

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Originally Posted by theoldwizard1 View Post
I am saying this is what is on the engine RIGHT NOW !


One UNSUCCESSFUL attempt was made. The two hole leading into the elbow did not line up.
Sorry! I must be going blind because I didn't see where you said " this is what is on the engine RIGHT NOW !

AND I wasn't aware you had made One UNSUCCESSFUL attempt to make one up. I don't know why your attempt was unsuccessful as I had no problem.

Just reading some threads, the old ones were "high rise" and the newer are " low rise". I really wouldn't be able to tell the difference between a high rise and a low rise but if you look here you might see the one you want.

https://www.google.com/search?q=volv...55k1npo1oqzrnM

There are also photos of mixers that have been made up for $150. Maybe A64Pilot can help. This is discussed in the following thread.

https://www.cruisersforum.com/forums...ng-127477.html
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Old 13-06-2020, 05:39   #6
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Re: MD2020 High Rise Exhaust Elbow

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VP makes a bronze high rise exhaust elbow for the D1-20 engine that will bolt on to the MD 2020 manifold, but the water hook up is not exact, and will require some adapting.

Might be worth looking into. VP part # 3884165
Nope !

The rubber "boot" from the heat exchanger makes and immediate 90 into the water inlet nipple on the elbow. No room for adapting.
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Old 13-06-2020, 06:02   #7
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Re: MD2020 High Rise Exhaust Elbow

I finally was able to snag a picture of the old one !

Click image for larger version

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You can clearly see the water and exhaust inlets.

So I don't have hands or eyes on the engine. The exhaust hose goes into some kind of "muffler" (?) before exiting the boat.

They have a brand new "low rise" elbow in hand

Click image for larger version

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It clearly will bolt up, but the obvious concern is backflow from a following sea.

With the muffler in between, is the high rise really needed ?
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Old 13-06-2020, 06:09   #8
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Re: MD2020 High Rise Exhaust Elbow

I think I finally found it ! VP #3581031



Now find one in the US ! Even the British place that list it say out of stock and the price is >900€ !!

There has to be a more cost effective solution !
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Old 13-06-2020, 06:17   #9
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Re: MD2020 High Rise Exhaust Elbow

Yep, forgot about that one....

As I now recall that was a carry over from the old Perkins M20/M30 Pirama engines, and may also be available from Perkins.

Whether the standard elbow can be used is a function of the configuration of the rest of the exhaust system. Seems to me that if someone went to the trouble to install the riser in the first place, its probably necessary.....
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Old 13-06-2020, 08:54   #10
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Re: MD2020 High Rise Exhaust Elbow

Put the salt water supply vacuum break in the inlet hose between the salt pump and the heat exchanger. Use the later style down turn elbow (which they have). Make sure there is a vented loop in the exhaust down stream of the water lock muffler.
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Old 13-06-2020, 09:12   #11
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Re: MD2020 High Rise Exhaust Elbow

Go over to Defender and look at all the gooseneck and waterlock mufflers that can be had in plastic/GRP for < $200. Use the low-rise elbow in hand and install one of those if you have the room to make it fit. All designed/intended to keep out water from a following sea, cheaper than the Volvo part, and probably more effective.
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Old 13-06-2020, 10:16   #12
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Re: MD2020 High Rise Exhaust Elbow

Use rubber exhaust hose all the way to the stern.
Then us 90 deg stainless steel welding elbows (bends) and some pipe to first go up vertically and then to a fabricated gooseneck. (Two 90 deg bends welded together) The top of the gooseneck can go as high as decklevel or just below that.
The exhaust pipe (downleg) can of course be much lower in the stern.
Backflow impossible.
It works perfect for me already 20 years
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Old 13-06-2020, 12:21   #13
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Re: MD2020 High Rise Exhaust Elbow

MESA, (Marine Exhaust Systems of AL) can fabricate a custom stainless part cheaper than you can find and buy from factory parts source. Ask for Mark.
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Old 13-06-2020, 12:21   #14
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Re: MD2020 High Rise Exhaust Elbow

Hi
You may find Bukh will have a less expensive solution in SS

https://bukh.co.uk/contact-us/
They will advise if you would need also an exhaust muffler box.
John
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Old 13-06-2020, 13:48   #15
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Re: MD2020 High Rise Exhaust Elbow

Also, an email to a local Beta Marine

https://betamarine.co.uk/internation...-distributors/
is another option
John
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