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Old 07-03-2016, 12:19 PM   #1
johnlaudano
 
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Default water-cooled trimmer conversion, VEE 4 drawing, and flat head drawing

The Forum moderator has asked for updates on members' activities so I thought I'd add something for what it's worth.

I've converted a troybilt trimmer engine to water-cooled. It will go into another 65" mahogany boat (see prior posts). The water pump is an internal gear pump made from a honda oil pump. See photos below.

The attached drawings are designs I've been working on recently. I don't have the machinery to build them unfortunately. The vee four has a displacement of 200cc. The flat head is 100cc. The vee design could also be a twin and the flat head could be a four I suppose.The pump for the vee four is a dual-chamber gear pump of my own design.

My next project will be a design of an in-line four at a size I think I can construct. It will have a displacement of about 100cc's.

Below is a link to a video of the converted engine running. I think the ignition system is interfering with my cameras's electronics and that is why the distortion is present. I worry now that, without shielding, an R/C system won't be reliable.



Attached Thumbnails
DSC_0225.jpg   DSC_0223.jpg   DSC_0228.jpg   DSC_0233.jpg   DSC_0220.jpg  

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File Type: pdf A NEW ENGINE-Model.pdf (135.1 KB, 296 views)
File Type: pdf VEE FOUR-Model2.pdf (29.9 KB, 244 views)
File Type: pdf VEE FOUR-Model.pdf (120.2 KB, 246 views)
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Old 07-10-2016, 07:00 AM   #2
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brilliant work I love these little 4 strokes
I am at the moment in the planning stage of twinning a g x 35 honda


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Old 07-10-2016, 04:53 PM   #3
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John,

Thanks for posting your recent work. Interesting way to form a water jacket. How did you keep coolant passages open under the epoxy? I'm guessing you used an epoxy of some sort.

Nice work on your engine designs. Please keep us posted on your progress.

I remember your watercooled inine twin.

Chuck
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Old 07-15-2016, 03:58 PM   #4
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Chuck,
I used o-ring segments between the fins glued in place with cyanoacrylate and then coated them with self leveling rtv. To allow water passage between the fins I drilled small holes in the inner fins. The o-rings are a tight fit and need to be stretched when being installed. Time will tell if there is a leak; there's at least six months more work to be done on the boat.
I considered epoxy alone as a way to seal the fins but the expansion rate of the aluminum dosent match the epoxy. In order to create the empty space for the water I would have used wax and then melted it out. This method might work with wax and a flexible adhesive in place of rigid epoxy but that has its own issues.
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Old 07-15-2016, 05:18 PM   #5
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John, thanks for the explanation. That's a very innovative way to make your water passages.

Chuck
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Old 07-17-2017, 11:18 AM   #6
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Default Water cooled trimmer conversion in the boat

This is an update on the use of the converted trimmer engine. It's finally in the completed boat and, if the weather is good, will have its first time in the water this Friday. The exhaust system has a large muffler and is water cooled(wet) and it sounds great. I'll have a video at some point.
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Old 07-17-2017, 09:26 PM   #7
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Just beautiful!! do you have plans for the boat or a build log somewhere?

thanks
Mark
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Old 07-18-2017, 10:06 AM   #8
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Thanks.
I made the drawings myself but i didn't write a build log. I do have misc. photos.
this probably isn't the forum for those but I don't know yet of a proper one.
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Old 07-19-2017, 07:06 AM   #9
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Is this a different boat to the one with the twin in it? Would the plans be available? Thanks
Mark
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Old 07-19-2017, 07:51 AM   #10
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Quote:
Originally Posted by johnlaudano View Post
this probably isn't the forum for those but I don't know yet of a proper one.
I'm sure most people on here would be interested in seeing them, especially considering the quality of the finished boat. Please, go ahead and post them!


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