A Seagull 4 stroke ???

D

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Well here is one for the Seagull aficionados.
I am into model engineering in the winter months & this came up on a forum
https://www.homemodelenginemachinist.com/threads/british-seagull-4-stroke-idea.30658/#post-318315

I really hope that the link works. The chap sounded serious although his comments about reliability may choke a few forumites so make sure that you do not have a mouthfull of toast & marmalade when you click the link

Would be fun to see one though.
Re invent the British Seagull--- Come on Brexit, tell the world that GREAT Britain is back & we are ready for anything--
Oh dear-- The lad is an Aussie!!! Carp idea:ambivalence:
 
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Easy to be rude about other outboard makers, doesn't help anyone though.
It's one thing to put a few parts into CAD, but the tricky issues of how to drive the camshaft, how to make a cylinder and cylinder head and many others need thinking about.
I've seen amateur built and seriously mod'ed small engines, it's not that hard to make something run, but to make something that's actually any good is much tougher.
The starting point, the premise that you can't make Seagulls because they are two strokes, is also flawed, just because something is a 4 stroke doesn't mean its emissions will be acceptable.

TBH, the main positive thing about a Seagull is that it's a simple 2T engine. Take that away from it and it's just crude and heavy.
 
He will have to think about how he is going to lubricate it, particularly as the main bearings depend on the oil in the 2T and have no seals to take any pressure lubrication. Also if he puts anything like the compression ratio, revs and power he is talking about through the standard crankshaft it will explode out of the crankcase and put a big hole in the wall of his shed!
 
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