Eberspacher exhaust pipe length query

[oldgit]

Can anybody indicate the max length of run of exhaust on diesel heater.Want to exit via the transom if possible,not out of side of boat,which could be a bit anti social if somebody wants to lay alongside without getting melted gelcoat?
Thanks in advance

 

[pvb]

Can anybody indicate the max length of run of exhaust on diesel heater.Want to exit via the transom if possible,not out of side of boat,which could be a bit anti social if somebody wants to lay alongside without getting melted gelcoat?
Thanks in advance

Which model of Eberspacher??

 

[Martin_J]

Just checked the installation instructions for the D1LC, B1LC, B3L and D3L... All four say min 0.2m and max 2m for the exhaust outlet.

 

[Martin_J]

D2 and D4 instructions say min 8" and max 6.5' for exhaust.

These instructions also say..

Note: Bends in both the intake and exhaust pipes should be kept to a minimal. For every 90° bend it is recommended to shorten pipe by 16” (40cm).

Warning: The exhaust is hot, keep a minimum of 2” clearance from any heat sensitive material.

Warning: Route exhaust so that the exhaust fumes cannot enter the passenger compartment.

 

[Martin_J]

Including a silencer in the exhaust helps greatly..

As per the title... having a silencer in the exhaust helps a lot.. It really seems to reduce the roar!

 

[jdc]

Max 5m?

My Mikuni MY30 manual says min 1m, max 5m. My boat did have an Ebberspacher Airtronic D4 which I changed but the exhaust length was pretty miuch the same at just over 3m. I've not had any problem with this on either the Ebber or the Mikuni (reason for change was flooding due to air intake not an exhaust problem). There is a right angle immediately below the heater, and a 180 degree swan-neck near the exit, which again doesn't seem to cause a problem.

 

[pagoda]

D2 and D4 instructions say min 8" and max 6.5' for exhaust.

These instructions also say..

Note: Bends in both the intake and exhaust pipes should be kept to a minimal. For every 90° bend it is recommended to shorten pipe by 16” (40cm).

Warning: The exhaust is hot, keep a minimum of 2” clearance from any heat sensitive material.

Warning: Route exhaust so that the exhaust fumes cannot enter the passenger compartment.

They DO get pretty hot- and there are woven (like elastic bandage) heat resistant socks to cover the exterior with. Make it as short as you can - it reduces the chances of any condensation taking place inside. As mentioned if it routes through an aft cockpit locker be VERY careful nothing flammable can get in contact with the exhaust.
Toasted fender anybody? Easy done...

Graeme

 

[lw395]

I think there is an issue with eberbasto's in boats, in that the exhaust outlet needs to be hot, in order to stop the vapour condensing. In cars and trucks this is not a problem as the exhaust runs downward.
IIRC burning a litre of oil produces two litres of water? Among other products.
The silencers available often have drain holes, so will leak a small amount of fumes and corrosive condensate into the hull space.
An effective silencer is a good idea though.

 

[Pagetslady]

I bought a silencer and installed it on my D4, and it is not for use on a boat as it leaks, OK under a wagon or van, so I had a spare metre of exhaust pipe with a bit of messing about with different bits of solid pipe I have made it so that it connects to the skin fitting with the silencer on the end of the flexible pipe and hangs from a stanchion, this makes an incredible difference to the noise which is very noisy without I only use it in Marinas and when the noise would annoy neighbours. But the fact it leaks doesn't matter.
Mike

 

[Martin_J]

Strange... I'm not at the boat at the moment but the silencer/muffler on the exhaust of my D4 has no drain hole... Will post a pic later and see if there is a part number on it...

I also have a muffler on the outlet hose to the cabin.... Not sure how much effect that has but it's a huge item!

 

[steve28]

this one on ebay shows the drain hole, its upside down in the picture.





http://cgi.ebay.co.uk/WEBASTO-EBERS...tEquipment_Accessories_SM&hash=item4ceac06b9d

 

[oldgit]

And now thw skin fitting.

Thanks for all input,the heater will be a D2.Will keep the exhaust to around 2m.
This will limit where actual burner can go but am determind to exit through stern.
Now need a bit of ingenuity to sort skin fitting.

 

[DogWatch]

Thanks for all input,the heater will be a D2.Will keep the exhaust to around 2m.
This will limit where actual burner can go but am determind to exit through stern.
Now need a bit of ingenuity to sort skin fitting.

I am doubling up on my lagging so have just bought some new to go over the old... It actually arrived today from here Ebay good price

Skin fitting from Ebay again here

EBERSPACHER S/S EXHAUST CLAMPS FOR 24MM EXHAUST PIPE (necessary, don't use jubilee, they wont work, I tried them first)

No connections to above, but can vouch for the seller eberbasto who I have regularly bought from and I know many on PBO have been satisfied with purchases from him also.

 

[PeterGibbs]

D2 and D4 instructions say min 8" and max 6.5' for exhaust.

These instructions also say..

Note: Bends in both the intake and exhaust pipes should be kept to a minimal. For every 90° bend it is recommended to shorten pipe by 16” (40cm).

Warning: The exhaust is hot, keep a minimum of 2” clearance from any heat sensitive material.

Warning: Route exhaust so that the exhaust fumes cannot enter the passenger compartment.

This is a real issue and you are right to be concerned. Bends are really a no-no in these systems becasue the exhaust pressure the usual 2-3kw unit can generate is not sufficient to overcome such restrictions. Pipe diameters influence this too but flow is not guaranteed by ever larger diameter exhausts. The manufacturer will give you the specific info you need.

PWG

 

[jdc]

This is a real issue and you are right to be concerned. Bends are really a no-no in these systems becasue the exhaust pressure the usual 2-3kw unit can generate is not sufficient to overcome such restrictions. Pipe diameters influence this too but flow is not guaranteed by ever larger diameter exhausts. The manufacturer will give you the specific info you need.

PWG

Peter, can you share your experience of the problems of bends and how one could tell if bends are causing a problem in a particular installation?

The reason I ask is that my boat's exhaust was installed at build time, not by me but by the boat builder, and has both a right angle (standard option from Ebber - see thumbnail) just under the heater and a 'swan neck' near the transom outlet, which is also considered good practice I understand. So according to your and other posts above it's way outside the installation guidelines (3m long, one right angle and one 180 degrees). Should I be worried?

On the other hand, according to the boat builder the exhaust pipe was supplied by Ebber themselves as a pre-fabricated assembly specifically for that model of boat and heater (D4 airtronic).

It's also strange that the Mikuni gives a max length of 5m in the installation guide: ok it's for 28mm dia pipe, but that seems insufficent to explain the factor of 2 1/2 difference in recommended max length between it an an Ebberspacher. Is there some difference between manufacturers in susceptability to back pressure which you know about? First hand experience would be terribly useful.

James