A Sleeve Valve Mystery Model. (Upd. V: NO sleeve valve; similar to Burtnett Burnell?)

Here is the answer after asking the American Heritage Center for info on this engine: Thank you for contacting the reference department at American Heritage Center (AHC), University of Wyoming. Your request has been received and is being logged and assigned to one of our archivists for reply. Each request is important to us, and, in fairness to all of our distance patrons, we strive to answer requests received by mail, phone, or email in the order received. Typically, requests are answered within 30 days but some requests may take as long as 60 days to fulfill.
Please be patient, I will ad the info once I receive it.
Thanks so far for all your help!

I think Bart is right. I have contacted the owner from the Burnell drawing and will ad his answer here. This model Bart mentions has the same patent year....

R.R.: I found it, see:
http://www.prewarcar.com/magazine/previous-features/it-s-an-engine-jim-but-not-as-we-know-it-update-surviving-4-cylinder-002459.html

I can't find anything by that name Bart, is this the correct name / brand?

Cannot find my previous item on the Burtnett Burnell engine on the site anymore but I think there are similarities

It looks like the same '9' stamp (see the highlight on the right side of the middle horizontal) was used for the date so I would think 1929.

This is certainly not a "sleeve valve " engine as fitted to Knight engined cars or Minerva. In these there are two sleeves sliding in the bore with the piston sliding within them. In the model shown , it could only be described as "sliding valve" arrangement
Reg Harris

Definately not sleeve valve but seemingly a still born piston valve concept which would have surely quickly cooked and seized the exhaust valve piston if it was ever used in anger.

The patent model engines is not in fact a sleeve valve unit, but a variation on the piston valve engine, of which the best known motorcar version was probably the Hewitt.

Both the Knight double-sleeve valve engine, as introduced by Daimler (Coventry)in 1908/9 and also used by Willys amongst others, and the single-sleeve units made under the Burt-McCollum patents had thin-walled cylindrical 'sleeve(s)' within the engine cylinder, the piston working inside the sleeve(s). Apertures in the sleeves allowed the ingress of the fuel-air mixture and egress of exhaust gasses.

Piston-valve engines were a variation on the slide-valve principle that had been used on steam engines almost from day one. It is difficult to see what might have been patentable about the system seen here, the inlet exhaust 'tubes' within the piston-valves merely introduce a further complication.

MJ