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Author Topic: Ic four stroke conversion  (Read 2021 times)

Biscuit

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Ic four stroke conversion
« on: January 07, 2017, 08:29:51 PM »

hi all, not been on here for a while, I just thought I share with you a build I been working on over last few weeks, originally this boat was electric but so boring. I managed to find an old Os 40 four stroke that I got up and running and converted it to marine use. Now I wanted to have reverse with the ic engine so made myself a gearbox with a clutch so can tickover in the water without moving and change gear, had to fit a pump to cool the engine when not moving, I have run motor up and gearbox works as does clutch and water cooling just need to give it a run now. I was hoping to post some pics but won't let me :((
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Stavros

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Re: Ic four stroke conversion
« Reply #1 on: January 07, 2017, 09:05:21 PM »

Message sent




Dave
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Martin [Admin]

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Biscuit

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Re: Ic four stroke conversion
« Reply #3 on: January 31, 2017, 08:53:52 PM »

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Biscuit

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Re: Ic four stroke conversion
« Reply #4 on: January 31, 2017, 09:00:58 PM »

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Biscuit

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Re: Ic four stroke conversion
« Reply #5 on: January 31, 2017, 09:08:21 PM »

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Biscuit

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Re: Ic four stroke conversion
« Reply #6 on: January 31, 2017, 09:18:45 PM »

juxt a few vids of my boat and gearbox


https://youtu.be/OkT9vXn9-uA
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MartinL

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Re: Ic four stroke conversion
« Reply #7 on: January 31, 2017, 11:07:21 PM »

Biscuit that is brilliant, was only talking today with my mate in workshop about how difficult it would be to a put one of my four strokes into a boat, did you use a centrifugal type clutch? How did you water cool the engine?
Really got me keen to try it now. Well done.
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Biscuit

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Re: Ic four stroke conversion
« Reply #8 on: February 01, 2017, 10:38:57 AM »

Yes I made the gearbox myself after finding out how they worked, I then made a clutch similar to a model car and hooked it all up. The engine is an old Os 40 aero engine which someone gave to me as a non runner with a broken casing and was seized solid, but after stripping it down I just had to clean it out of old castor and replace the bearings and lap the valves in. I had to make my own cooling ring after turning the fins down a few mm and heat shrinking it on, sounds easy but had 5 attempts to getting it right. I knew I wanted it ticking over in the water so had to rig up a pump to give a constant flow, I bought a car windscreen washer pump but that leaked and was too powerful, I found an old model flight box with a fuel pump and now using that, it is linked up to an esc and mixed with throttle channel so the faster you go the more water is pumped. I have not tried the boat as last time out our flying lake was frozen and this week they got a mud run there so hopping for the week after.
The boat itself I had brushless to start with with sound systems and lights but just had no soul, it's been weathered and believe it's been scratch built, some kind of Vosper I think.
Sorry to bomb the thread with videos but could not get any pics on here, hope it will just plod around and sound nice, will get a vid of it running soon.
Steve
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Biscuit

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Re: Ic four stroke conversion
« Reply #9 on: February 25, 2017, 07:03:08 PM »

I have a short vid of my Ic  four stroke conversion with reverse gear box, was nice and choppy today.
https://youtu.be/647n-Sk16Uk

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Jonty

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Biscuit

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Re: Ic four stroke conversion
« Reply #11 on: March 01, 2017, 09:35:59 PM »

Yes few years old
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