Motor ID help needed

[BigLakeBob]

My friend finally acquired the motor from the barn finder. I'll attach more pics. Bore looks real nice and measures 3.993". Stroke 3 3/4". Spark plug is 1/2-14 NPT. There are threads on the intake tower to possibly hold a carb. The exhaust port ID is 1 1/2". Of the three mounting lugs on the case only two are threaded 3/8-16. The cam is a two lobe which appears one is for the ex valve and the other for an oiler. The head is removable with a 'sub' plate between the head and cylinder top. Any help appreciated. My friend will have it at Wauseon looking for info.

[BigLakeBob]

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[BigLakeBob]

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[BigLakeBob]

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[BigLakeBob]

Showing head then detachable spacer plate. DSC06909.jpgDSC06910.jpg

[exeric]

I have to wonder if someone modified the atmospheric valve chamber for some reason. Otherwise, I can't see how it gets it's fuel/air charge. This picture of a Raycycle single shows the intake manifold enclosing the intake valve chamber, and also sealed the intake valve cage into the cylinder. I don't see how Bob's friends engine could work as it is currently configured.

Racycle%203a.jpg

[exeric]

I was going to add, I think that engine shows high quality pattern work, and good engineering, but I would be surprised if it was earlier than 1908. Very unusual to see a quality motor with no markings, or 'cast-in' name, and a removable head.

[Tommo]

I'll throw this into the ring and say it looks like it has been modified for use as an air compressor

[exeric]

I'm sure you're right, Peter. Wish more people had made compressors out of early motorcycle motors instead of scrapping them out.

[pem]

When I interviewed Perry Mack's son Bill he had a single cylinder 1913 Mack Motor his dad converted into an air compressor. Last time I saw it it was used in a "Fantasy Bike". It was polished and plated and in my opinion ruined. The only single cylinder Mack Motor I had ever heard of.

[Tommo]

I saved my E.R.Thomas motor from being coverted into an air compressor.
It was fitted in a rotary hoe and had been replaced by a Briggs and Stratton and the owner was going to make an air compressor out of it.
I swapped it for an Industrial JAP motor
Engine number 878
For whatever reason the site won't let me upload images any more so no photos for you to see.

[Tommo]

A couple of phots of the Thomas DSCF4545.JPGDSCF4549.JPG

[BigLakeBob]

Thanks for the comments and feedback. My friend has it at Wauseon now, I'll report back if anyone there can shed some light on what it is.

[BigLakeBob]

Seemed to have been determined not an atmospheric intake valve but cam operated, about a 1/4 inch lift. With such a large bore possibly used as a bicycle racer pace bike.

[exeric]

What a lousy detective I would make. I didn't notice the intake pushrod guide. Apparently no leads about it's origin, or maker at this point.