| Author |
Message |
    
andrew_d
New member
Username: andrew_d
Post Number: 2
Registered: 04-2021
| | Posted on Sunday, April 04, 2021 - 07:33 pm: | 
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Hi, I am about to fit my Simplex 5/7 to my clinker putter and have heard that the exhaust outlet should be below the engine exhaust manifold, is this really necessary, any advice would be greatly appreciated. |
kingfisher
Advanced Member
Username: kingfisher
Post Number: 39
Registered: 01-2013
| | Posted on Monday, April 05, 2021 - 01:45 am: |
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I imagine the advice is based upon ensuring water doesn't get back into the cylinder, particularly at rest. I have one putt putt with a side exhaust like yours and the outlet is about level with the manifold. However it has an 'octopus' fitted - an extra spherical casting designed by Pompei (I'm told) specifically to stop water getting back. The other putt putt has a rear exhaust and the outlet appears to be higher but it's difficult to compare the relevant levels while it's sitting on the trailer. So I'm not being a lot of use. In both cases the exhaust drops from the manifold directly to the bilge then comes up again to the outlet. I imagine the issue (or lack of) is common to most engines, so hopefully someone has a more definitive answer. |
miro
Senior Member
Username: miro
Post Number: 1129
Registered: 11-2001
| | Posted on Monday, April 05, 2021 - 08:58 am: |
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From the pictures you can see that the outlet through the hull is slightly above the manifold outlet.
http://www.oldmarineengine.com/discus/messages/4/423676.html
But in between is the muffler. The muffler has a drain that is below the water line. But there is a
valve between the bottom of the muffler and the drain . I use that valve to drain the muffler after I have finished cruising and the boat is out of the water, so the muffler is empty of water.
And I store the boat with that valve closed. The valve is also closed when I am running the boat.
It's important to have little or no water in the muffler when starting so the 2 cycle engine exhaust has somewhere to go, when starting it on the next cruise.
The DisPro boat design has the muffler exhaust slightly below the engine manifold exhaust, but not by very much. It's muffler also has a drain that is below the water line.
Here's a picture of the arrangement.
I expect that you will create your own version because each combination of boat , engine and muffler is different.
miro |
miro
Senior Member
Username: miro
Post Number: 1131
Registered: 11-2001
| | Posted on Tuesday, April 06, 2021 - 08:29 am: |
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Here's a video of a DisPro at work - it shows the muffler and engine arrangement. The cooling water has an inlet to the muffler and there is a drain underneath. About 1/3 of the water goes out the drain and the rest goes out the exhaust port.
https://youtu.be/ecV2g15fGHc |
josephthird3outlookcom
New member
Username: josephthird3outlookcom
Post Number: 1
Registered: 05-2021
| | Posted on Friday, May 14, 2021 - 05:45 am: |
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I have Blaxland Chapman Twin looking for 2 new Champion 25 spark plugs |
chris_spring
Senior Member
Username: chris_spring
Post Number: 111
Registered: 02-2019
| | Posted on Friday, May 14, 2021 - 07:22 am: |
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You can get plugs at NAPA. |
kingfisher
Advanced Member
Username: kingfisher
Post Number: 40
Registered: 01-2013
| | Posted on Wednesday, May 19, 2021 - 09:39 pm: |
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"I have Blaxland Chapman Twin looking for 2 new Champion 25 spark plugs". I have some used ones if you're interested. Call Mark 0428 643 018. |
