'Eberspacher' insulated exhaust pipe

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pcatterall

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\'Eberspacher\' insulated exhaust pipe

Was very interested to learn in the previous 'Eberspacher D2' thread that there is a 'special' pipe for this. Apparently double skin with insulation between, plus some comments about a black covering material. One report mentions being able to hold the exhaust pipe when the heater is running.
I have been using 'off the shelf' flexi SS pipe and it does get very hot.
What are peoples experience of this 'proper' exhaust and also compared to the ordinary stuff with insulated 'bandage'
Having written this i think I will do some trials in my workshop.
Get a sample set up of each and test them under (fairly) scientific conditions.
Still interested in your views though.
regards
 
Re: \'Eberspacher\' insulated exhaust pipe

As supplied, it was nothing more than the old type of exhaust pipe
with woven outer and with what looks like some of the smaller bore
eberspacher outlet flexi pipe slid over it.It came from the dealer like this.
I was concerned that it got quite hot initially but it did cool down.
A bit like juggling a hot spud in my efforts to route it away from
the hull and various pipes and cables.


The double skin refers to the stainless transom fitting where the
actual exhaust outlet is separated from the hull fitting by an air gap
until well inside the hull.

It also appears that on the latest models the the inner exhaust through
the transom is of smaller diameter as the air gap is noticeably bigger
than the old one I took out (D3L).

I thought of further insulating the exhaust with some of the insulation that
Eberspacher sell but was advised against this by the dealer.

Let me know if you if you find a better solution.

Cheers

CS
 
Re: \'Eberspacher\' insulated exhaust pipe

Just visited the eber-basto site on EBay, (the guy is very knowledgable on eber matters from previous contact)
He advertises 'double wall' ss exhaust 'suitable' for ebers etc at £12 per m which is the ebay 'going rate'.
This is what I have been using, I dont understand the double wall term and there is certainly no insulation sandwich.
I have ordered some from him and also his insulation sleeve which looks like a woven fabric type.
I am concerned that in a boat situation, if the exhaust is hot enough to ignite something in contact then it is dangerous ??
You could instal a set up which is safe until some crew member unwittingly stuffs , say, clothing into a hole which was not meant to be used and it comes into contact with the exhaust. ( It might seem a good place to dry your socks!!)
It would be good to eliminate this risk.
I will also try some of the car exhaust lagging, presumably one could use several layers of this?
The idea of a larger bore pipe with heat resistant spacers appeals but sounds difficult to install in our usually confined places.
 
Re: \'Eberspacher\' insulated exhaust pipe

Mine is installed with the "twin wall" and woven insulation from Ebay.

I spose the tube is sort of twin walled, just a tiny gap and no insulation in the gap. It's not really what I would call twin walled. The woven insulation.... well that's not very effective either!

If anyone comes up with a suitable suggestion I'd be very interested. I was considereing rock wool or similar in strips and held round with some some stiff wire or similar.


Jim
 
Re: \'Eberspacher\' insulated exhaust pipe

I will test as discussed. I do deal with these heaters for bear money so always have a couple on the go in my 'shed/shop'
I am able to conduct reasonably scientific tests there.
Big suprise on my recent noise test was how effective the inlet hose silencer was ( and, no, I am not touting for sales)
Cheers peter
 
Re: \'Eberspacher\' insulated exhaust pipe

Yes Jim I was suprised. Once the exhaust noise is reduced by venting outside ( give the noise to someone else??) There is still a lot of residual noise I thought it was just the motor and internal burning roar until I popped on an inlet silencer that was lying around. It reduced the noise by around 60%.
Of course this is on the bench wherase most heaters are in lockers/boxes and such so the value of the silencer may be reduced.
Around £15 on ebay ( not mine, honest!!)
 
Re: \'Eberspacher\' insulated exhaust pipe

Hi Guys,
The Marine version has a (roughly) 25mm internal exhaust 'hose' of flexi stainless steel, there is then a fire proof insulating material (similar to asbestos - but something more modern - this is about 10 - 15 mm thick.. then there is an (apx) 50 mm outer stainless steel flexi hose.

An eber silence is available for the exhaust and one for the intake duct if needed. Also, an exhaust oulet elbow (from the D2 / D4 unit) with a small drain unit fitted.

Hope that helps

Joe.
 
Re: \'Eberspacher\' insulated exhaust pipe

We have the 'Marine' version as described by Captainslarty. It get hot enough to melt some plastic sheet that happened to be near it and I was worried about some dock lines that I was hanging on pegs nearby and resting against the exhaust duct. However after several years lines don't seem to suffer at all so it can't be as hot as all that...
 
Re: \'Eberspacher\' insulated exhaust pipe

[ QUOTE ]
The inlet hose silencer isinteresting at the noise can be come obtrusive.


[/ QUOTE ]

Jim, If you want to try a low-tech (free) solution, I have for many years used a cardboard tube attached to my air intake pipe (which takes air from the cabin to recirculate). The tube has lots of small holes pieced in it . and the end blanked off. This significantly reduces the noise and causes minimal restriction to the air flow. It's about 3 ft long.

Vic
 
Re: \'Eberspacher\' insulated exhaust pipe

again, we get ourselves bent out of shape with simple little things that we read as being enormous probs, i bought a hot water domestic tank lagging kit, figlass covered with moderate heat resistant plastic, i used some of plastic coated stuff to lag some of the hot air ducting and stripped the plastic off some to wrap the figlass around the corrugated flexi exhaust, been there 5 years now with no probs. by the way the exhaust is std corrugated flexi stainless pipe that i source from a man in birmingham, it is 25mm inside and the std eber clamp tightens it nicely on to the exhaust stub, am getting some more ordered so if anyone wants some?
stu
 
Re: \'Eberspacher\' insulated exhaust pipe

Yes I can see that working. The noise seems to be generated at the mouth of the pipe, making a lot of small 'mouths' could well eliminate this. I guess there would have to be at least the same intake area. ( add a reed and we could get a good tune)
 
Re: \'Eberspacher\' insulated exhaust pipe

Skipper-stu thinks we are overdoing this thread!! Agread there are ways to solve these problems and I am looking for a good solution which will not cost a fortune. I will test some inexpensive items under controlled conditions and report my findings back to forumites. They can then then make their own judgement which may involve visiting their local scrap yard, delving into a skip or whatever. ( I use both these facilities all the time!!)
Regards
 
Re: \'Eberspacher\' insulated exhaust pipe

nothing wrong with spare parts bins aka skips!!
what i am saying is we seem to burrow down in to something instead of just doing it!!
stu
 
Re: \'Eberspacher\' insulated exhaust pipe

But there is a lot of satisfaction to be gained by finding an elegant and economical way of doing something. I love it when someone comes up with a crafty solution, which is one in the eye for the "traditionalists" or chandler-frequenters /forums/images/graemlins/grin.gif
 
Re: \'Eberspacher\' insulated exhaust pipe

yup agree thats why my insulation is made from hot water tank lagging, cheap. looks good, elegant?
stu
 
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