OS FS Four Stroke R/C Engine water-cooled with spark ignition

FS 120 converted to water-cooled and spark ignition low RPM

[@abcdefghi6046]

Comments are enabled now.

[@timjs1018]

Hi, it's me again. I was very curious how you made the water jacket?
I have 3 of the O.S. marine 4 strokes, but they are so rare that I don't want to use them. I'd much rather convert a standard 4 stroke to water cooling. I see your water jacket design is very similar to production marine engines. It appears you machined the crankcase and head fins to be round on the lathe, but thats as much as I can tell. I'd really appreciate it if you could elaborate on the design of the water jacket. I also enjoy machining and tinkering with model engines. Thanks! (Excellent channel by the way)

[@abcdefghi6046]

@@timjs1018
Thanks.
Yes the water jacket is a hollow chamber that i shrunk-fit to the machined casting. loctite 609 sealed it. the fittings are held in with JBWeld. the ignition set up is via Jerry Howell ent.
Everything is for sale...

[@timjs1018]

@@abcdefghi6046 Is there no inner wall to the chamber? The crankcase itself is in contact with the water?
-Tim

[@abcdefghi6046]

@@timjs1018 Yes. I machined the head also so that it matched the diameter of the jacket.

[@abcdefghi6046]

@@timjs1018 Yes you're correct. also i machined to head so it matched the diameter of the water jacket.

[@R.B_B]

How do you seal the whater jacket?

[@abcdefghi6046]

RTV silicone

[@robot797]

if you wanna sell that nice engine
I am interested

[@abcdefghi6046]

$450 plus $30 shipping if you are in the lower 48 USA states. I only sell on ebay.