enginehistory.org

sithomas · Joined: 01 Jan 2019 Posts: 28

How many valves per cylinder did the Cosmos Mercury have?

Wiki states two ( https://en.wikipedia.org/wiki/Cosmos_Mercury )
Flight July 3, 1919 page 871 states three. ( https://web.archive.org/web/20160603075457/https://www.flightglobal.com/pdfarchive/view/1919/1919%20-%200869.html )
Kim McCutcheon's excellent article states four. ( http://enginehistory.org/Piston/Before1925/EarlyEngines/C/C.shtml#Co )

The rear view photo shows the inlet piping going to one side of the cylinder only and two exhaust outlets, however the photos are not the clearest.

A side view would be interesting to see the spiral cylinder spacing - does anyone know of such a photo?

(Kim - Thanks for the articles. They are fascinating reading)

kmccutcheon · Posted: Mon Apr 18, 2022 15:02 Post subject:

Sithomas,
Thank you for providing the Flight references. Based on the images and descriptions there I have revised the article, changing the valve number to three.
Glenn Angle appears to have taken much of his Mercury write-up from the earlier Flight article but simply got the valve count wrong. The two exhaust stacks and single inlet duct per cylinder makes it pretty clear.
I tried to find a side view and could not locate one.
_________________
Kimble D. McCutcheon

jwells · Joined: 16 Sep 2003 Posts: 57 Location: Victoria, AUSTRALIA

For detailed information on the cylinder head construction of this engine. have a look at Patent No GB131053 which can be downloaded from the Espacenet website
As well, GB 119,356 and GB153,049 also provide some excellent drawings of aspects of this most interesting engine.

sithomas · Joined: 01 Jan 2019 Posts: 28

That is excellent! Thank you.