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Post by Deleted on Oct 31, 2017 19:30:33 GMT
I believe there were experiments with "washing" the exhaust gasses from commercial vehicles to get rid of the fine particulates but I understand there was problems with disposal of the heavily polluted water from the system. Water cooled exhaust systems on boats definitely seem cooler and cleaner (Shapfell has a water cooled exhaust) and I don't see why it wouldn't work ...... trouble is if enough engines were using it would it cause serious water contamination problems instead of air pollution, or are the numbers of boats small enough not to make much difference. I don't know the answer to that John. I wonder if the particulates would drop out into the mud. When one thinks about it I suspect that most early engine were raw water cooled. I was thinking about a gas/water separator as it seems to remove more than a it seems a straight raw water cooled system. It also has the advantage the water could be discharged below the water line and the result is a much quieter engine presence as well. I can confirm a below the waterline exhaust outlet keeps the deafness factor down. It does, however, raise the am I going to sink factor and associated stress levels. |
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Post by Graham on Oct 31, 2017 21:16:12 GMT
I don't know the answer to that John. I wonder if the particulates would drop out into the mud. When one thinks about it I suspect that most early engine were raw water cooled. I was thinking about a gas/water separator as it seems to remove more than a it seems a straight raw water cooled system. It also has the advantage the water could be discharged below the water line and the result is a much quieter engine presence as well. I can confirm a below the waterline exhaust outlet keeps the deafness factor down. It does, however, raise the am I going to sink factor and associated stress levels.  No I think it can be made quite safe for you  BTW not waterline, down about a foot below water line. |
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Post by JohnV on Nov 1, 2017 4:13:56 GMT
Oh, I like old engines in old boats Kris. The reason I don't have an old engine in Sabina is mainly because I was made an offer I would have had to be mad to refuse. (The Daewoo I have fitted is quite an elderly design (MAN) and is long stroke, normally aspirated with rev's of about 1400 giving about 7 kts) i suppose what I was asking you john what do you think about old boats continuing to run old engines that don't meet eu omission standards. I value your opinion john as your one of the more level headed ones on here. Thank you for the compliment .... though I am perfectly capable of exploding if someone pokes me with a pointy stick  I think old boats that are fitted with old engines should be allowed to continue using them irrespective of new regulations. The numbers are tiny compared with the huge number of road vehicles/generators etc and I can't believe that they would have any statistically noticeable effect. The same goes for genuine replicas ..... at the moment !!! If it suddenly became the fashion to build lots of "replica" boats to get round emissions regulations then that would be a different matter ........ there are always some who are looking for loopholes |
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Post by kris on Nov 1, 2017 7:11:45 GMT
Thanks very much for the reply john, that's basiclywhat I think. The amount of pollution created by vintage engines in old boats is miniscule compared tto road vechiles. I'll remeber not to prod you with a pointy stick then.
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No I think it can be made quite safe for you 
BTW not waterline, down about a foot below water line. 
