Anyone Recognize this 4 Cyl Air Cooled Engine? - Page 2
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  1. #21
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    The angled holes are for primers,the larger holes at bore centreline are core plugs,for the coreprint in the moulding,and a small thread to hold the cowling. .The valve caps are typical teens ,twenties.They were either made interchangeable,or one with a blank ,one with a sparkplug.The magneto drive is all missing........I wonder if there was a small aircooled tractor it belongs to?.......When I go to swaps ,I take "her indoors",and when I start looking at some interesting rusty iron,she snarls,and we quickly move on.

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    No provision for distributor im putting my guess on air compressor

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    Similar threads pop up on the H.A.M.B. forum from time-to-time. They might be able to help you out.

    My first thought is that it's something from the old racing world, but the exposed cam seems to rule that out. The ball bearings seem to rule out general-purpose motor IMO, might even put it in a lower quality range (?).

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    I believe that there are cam actuated intake and exhaust valves. If you look at the camshaft the lobes for each cylinder are in different positions to actuate the valves for that cylinder at different times.

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    After poking around some i do see quite a few similarities to the Henderson, pierce, fn. The ignition was a magneto setup driven off the timing gears. Op's engine has the hole and mounting studs for this. Here is an example of an early motorcycle eng.

    Google Image Result for http://s3.amazonaws.com/FreeClassifieds/24146/70/2017-5-3/45024643_1.jpg

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  9. #26
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    I also think it was an engine, not a pump or comprressor, as the camshaft drive looks to be the 1 to 2 ratio of a 4 cycle engine. A pump or compressor would be one to one as it would intake and exhaust in one turn of the crank, not needing the compression and power strokes.
    What are your plans for it? Probably "stuck"? Some oil in the cylinders to prevent further rust, cleaning and light oiling of the outside? A great diplay piece! I always love this stuff. Just wondering, would you tell us how much you paid for it?

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  11. #27
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    Quote Originally Posted by Limy Sami View Post
    What about a very early Nimbus? (Denmark)
    Definitely not. Nimbus had a single cast block and OHV.
    My vote is for compressor as well.

  12. #28
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    Pretty complex valve train for a compressor tho.

    ???

    Surely they had reed / check valves at that time?

    Prolly not carbon fiber Boyeson's, but .... ???

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    Think Snow Eh!
    Ox

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    That's not a compressor. Why would you need mechanically-driven exhaust valves on a compressor? In addition, if not for a magneto, what is the auxiliary drive for?

    Going back to the engine, what is up with the row of hex headed caps or fasteners down on the lower crankcase?

  14. #30
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    No gearbox or bellhousing mount

    marine?

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    CLeveland?? I too lean toward motorcycle origin.

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    https://www.hemmings.com/blog/2010/0...923-henderson/

    from linked search

    more similarer

    but internal cam

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  18. #33
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    Quote Originally Posted by rklopp View Post
    That's not a compressor. Why would you need mechanically-driven exhaust valves on a compressor? In addition, if not for a magneto, what is the auxiliary drive for?

    Going back to the engine, what is up with the row of hex headed caps or fasteners down on the lower crankcase?
    I think the bottom ones are likely crankcase drain plugs as the lower crankcase half likely has a segmented bottom. The upper one is likely for the crankshaft lube line for the center bearing.

  19. #34
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    As gustafson said no gearbox or bell housing. No provision for right angle drive needed in a motorcycle use.

    I don’t think it is marine. I have a couple marine engines from the period. They are water cooled and two stroke. Not impossible to be marine, I just don’t think it is.

    The hex nuts on the lower crank case half are for oil lines.

    More pics:



    Good news is it’s not stuck. Bad news is that there are no pistons. Crank looks machined from solid (billetAnyone Recognize this 4 Cyl Air Cooled Engine?) rather than forged indicating low volume or prototype maybe.



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  21. #35
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    Crank throw is 1 5/8. Cylinder ID is 2 5/8.


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    Quote Originally Posted by adh2000 View Post
    Crank throw is 1 5/8. Cylinder ID is 2 5/8.


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    Which I make about 70.3 cu in or about 1150 cc. …..but my maths is crap.

  23. #37
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    I think your math is OK. That’s what I got.


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  24. #38
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    Quote Originally Posted by adh2000 View Post
    I think your math is OK. That’s what I got.


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    Wonders have yet to cease

  25. #39
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    Is there any branding on the bearings? Metal stamps on the crank? Are the crank journals imperial or metric?

  26. #40
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    The center main journal measures 1.148”. The rod journals measure from 0.930” to 0.940”. To me not even conclusive as to English or metric. Maybe reground?


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