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Author Topic: Four strokes  (Read 17264 times)

Kmot

  • Guest
Re: Four strokes
« Reply #75 on: August 01, 2008, 07:45:23 PM »

Hello chaps!

I would be cautious about this FS-80 four stroke on ebay. First of all, if OS made a marine version engine, it came from the factory with a flywheel and not an airplane propeller drive washer. Also, this engine on ebay has an aftermarket prop spinner hub attached.

If you look at a factory photo of an OS FS-80 you will see the cylinder fins are rectangular, not round. Also, the water jacket on this engine is unlike any water jacket that OS installed on its factory marine four strokes. Notice this one has a stepped shape.

FS-80:

http://www.osengines.com/history/osm640/osm-1982-fs-80.jpg

Various OS Factory four stroke marine engines:

http://www.osengines.com/history/osm640/osm-1982-fs-40m.jpg

http://www.osengines.com/history/osm640/osm-1979-fs-60m.jpg

OS Engines Timeline:

http://www.osengines.com/history/ostimeline01.html
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Kmot

  • Guest
Re: Four strokes
« Reply #76 on: August 01, 2008, 07:47:11 PM »

Converting an aircraft four stroke to marine use is not hard. I converted a Saito FS-40 to marine version and have tested it on a bench with complete success:

http://www.youtube.com/watch?v=IzSygqHvLPY

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Kmot

  • Guest
Re: Four strokes
« Reply #77 on: August 09, 2008, 08:00:22 PM »


One on Ebay! - OS FS-80 Four Stroke Water Cooled RC Engine


http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=150276131906&ssPageName=STRK:MEWA:IT&ih=005

Sold for:

238.00 GBP = 456.818 USD   :o :o :o

If I ever put some of my engines up for sale they are going onto eBay UK!! lol... O0
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tobyker

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  • Location: Scotland - West Coast
Re: Four strokes
« Reply #78 on: April 27, 2010, 08:18:27 PM »

Been looking at my SCFS52 again - did some research on crankcase suction through the vent nipple using a tube from the nipple to a jar of white spirit. Discovered fluid spraying out of the side of the engine. The blind side of the camshaft tunnel is cracked. Too long since I bought it to complain, so have sourced a replacement ASP crankcase from JustEngines (ordered Sunday, arr Tues first post). Will re-build and get to know the engine with an aircraft prop. Interestingly the new crankcase came with the bearing in the blind side of the camshaft housing already installed. I wonder how many get bust when people try to put them in themselves!   The old one dropped out after heating the case with a hot air paint stripper, so it can't be that difficult. At least I now have a spare crankcase to file fins off to see where w/c pipes might go. I'm wondering about fitting a water-cooled gasket to the rocker box cover, though to go by the old OS engine cooling the backplate and the cylinder is enough. I did say this was along term project!
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