Eberspacher exhaust tee’d into existing engine exhaust

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QBhoy

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Hi guys
At the risk of boring you....looking for opinions other than the obvious and standard exhaust skin fitting option
I have a lovely wee (and extremely rare) 18ft speedboat, which I plan to fit an Eberspacher system into...and as discreetly as possible.
The boat has lovely “in gelcoat” graphics which symbolises the very rarity of the model. Obviously I don’t want to ruin this by cutting a hole through the hull and given the limited location of the heater options in such a boat, this would be inevitable should I use a skin fitting.
Now...the boat does have a lovely twin side exit stainless exhaust system for the engine already fitted. I’m wondering if I could simply t into this somehow. Surely if I angled it right, the engine exhaust wouldn’t back feed into the heater exhaust ?
I realise it’s a long shot to ask, given the rarity of such a set up, but I wonder if anyone on the forum has done the same with any success ?
Thanks guys.
 
I would be thinking disturbing the back pressure in the chosen side ,if V8 ,s or split manifold of the main motor if not ? and if a fancy ECU with multiple sensors these days - potentially cocking somthing up inadvertently.
So I would leave existing set up well alone .
Then there’s gases from one of the two sources runing the wrong way up t,others pipe if one is running .
If both are running ( unlikely but possible) the gas from the greater assume the main engine causing back pressure issues in the minor ,the Erber exhaust .
What does the fitting instructions say ?
Could you loose the separate outlet in The transom?
 
How do you intend to stop the positive pressure from engine exhaust from tracking back into the eberspacher unit and subsequently coming out through the cabin vents to poison you and your guests? Angling the T joint alone is not a guaranty that this catastrophic event wont happen . Apart from safety ,You also have to consider insurance implications
 
Last edited:
QBhoy said:
Hi guys
At the risk of boring you....looking for opinions other than the obvious and standard exhaust skin fitting option
I have a lovely wee (and extremely rare) 18ft speedboat, which I plan to fit an Eberspacher system into...and as discreetly as possible.
The boat has lovely “in gelcoat” graphics which symbolises the very rarity of the model. Obviously I don’t want to ruin this by cutting a hole through the hull and given the limited location of the heater options in such a boat, this would be inevitable should I use a skin fitting.
Now...the boat does have a lovely twin side exit stainless exhaust system for the engine already fitted. I’m wondering if I could simply t into this somehow. Surely if I angled it right, the engine exhaust wouldn’t back feed into the heater exhaust ?
I realise it’s a long shot to ask, given the rarity of such a set up, but I wonder if anyone on the forum has done the same with any success ?
Thanks guys.
Click to expand...

To preserve the good looks of your boat i would have a new oval stainless exhaust fitting made just like the existing but with a bigger elongated oval, extended aft, so the oval is the same height but about 50mm wider. The new fitting can then have the two exhaust outlets then a third, 25mm, outlet either aft of or between them, for the eberspacher. Obviously you would have to enlarge the hole in the hull but it would still look smart and there would be no risk of back pressures.

Www.solocoastalsailing.co.uk
 
Venturi effect will cause lower pressure in the exhaust pipe of the engine, cant see it getting back into the cabin.
Petrol engine for the boat ? That will produce carbon monoxide.
But, no I would not do it as the next owner may have some issues with the set up.
Extra skin fitting to match is a sound idea.
 
benchmark said:
How do you intend to stop the positive pressure from engine exhaust from tracking back into the eberspacher unit and subsequently coming out through the cabin vents to poison you and your guests? Angling the T joint alone is not a guaranty that this catastrophic event wont happen . Apart from safety ,You also have to consider insurance implications
Click to expand...

That wouldn’t happen. Where it would t into exhaust is open to atmosphere. Path of least resistance and all that !
 
Plum said:
To preserve the good looks of your boat i would have a new oval stainless exhaust fitting made just like the existing but with a bigger elongated oval, extended aft, so the oval is the same height but about 50mm wider. The new fitting can then have the two exhaust outlets then a third, 25mm, outlet either aft of or between them, for the eberspacher. Obviously you would have to enlarge the hole in the hull but it would still look smart and there would be no risk of back pressures.

Www.solocoastalsailing.co.uk
Click to expand...

Sounds interesting. I’ll look into that.
 
No Regrets said:
Just No.

It's going to kill somebody.
Click to expand...

Not sure how that would happen. It would be a sealed and stainless welded fitting. No more dangerous than any other exhaust from any other engine on any other boat, really. Then open to atmosphere at the exit pictured
In any case, I’m going for another stainless fitting. Not sure I want to disturb the existing exhaust outlet to attach it to. Apart from that, there is a stainless skim fitting for the bilge pump on the opposite side....and it isn’t terrible, being honest
Thanks
 
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