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| Muffler for a 3 hp lathrop |
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lee_billington
New member
Username: lee_billington
Post Number: 1
Registered: 05-2011
| | Posted on Saturday, May 14, 2011 - 06:01 pm: | 
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Thanks to Richard durgee I now have an engine for the replica of the Pokey.
now what should I use for a muffler the 4 hp Lathrop in Pokey has an orignal cast iron muffler.
would a straight pipe hurt the engine
photo of boat can be seen at http://www.flickr.com/photos/54426805@N04/
thanks
Lee |
miro
Senior Member
Username: miro
Post Number: 573
Registered: 11-2001
| | Posted on Monday, May 16, 2011 - 09:18 am: |
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A straight through pipe is what most boats have if they use a wet exhaust.
You should try to get the cooling water to enter the exhaust pipe as close to the engine as you can.
The combination of the cooling effect of the water and the water in the exhaust pipe act as a muffler to take out the bark out of the engine sound, yet it keeps the pop, pop, pop, pop.
Most folks put in a length of radiator hose ( 12 - 15 in) to lessen the vibrations from the engine.
Since most water pumps on these engines are pretty good and the lake water is relatively cold, you'll find that your exhaust pipe will only be warm, not hot to the touch downstream of the water injection point.
Dry exhausts, by contrast are very hot and very loud.
miro |
lee_billington
New member
Username: lee_billington
Post Number: 2
Registered: 05-2011
| | Posted on Monday, May 16, 2011 - 10:04 am: |
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the exust on Pokey is dry and hot I have permante burn marks from messing with the bildge pump
I would worry about getting water back in the engine as there 2 stroke
Lee |
ernie
Senior Member
Username: ernie
Post Number: 1338
Registered: 01-2002
| | Posted on Monday, May 16, 2011 - 07:47 pm: |
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Lee,
Take a look at the pics of my fan tail launch. I have not had any water problems from the exhaust. The exhaust is described in various posts in the link below
click here |
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