Identification Help

[exftrplt]

Can anybody Identify the cylinder pictured? The bore at the base as nearly as I can measure is 5.004 inches.
Thanks
Gennaro

[Bob Dingley]

Sure looks like a Pratt. Take another bore measurement. A 985 is a touch bigger.
Bob

[champ driver]

It can't be a 985, you have to be looking at the rear of the cylinder in this picture. If it was the front of the cylinder you would see where the pushrod tubes mount into the front of the rockers. Also the Pratt 985 doesn't have those large radius curves in the fins near the plug hole, that detail is very unusual. The Pratt has the exhaust exiting the cylinder at the rear, this one exits on the left side of the cylinder in this picture, you can see the studs. And the 985 has cylinder hold down studs evenly spaced around the base, this one has 2 on each corner.
Please post another picture or two.

[exftrplt]

Your wish is my command. I have hammered on my mikes to get them to bend enough to go to 5.1875 but the won't bend enough. The 5 inch sounds like Wright J-6 but that is clearly wrong.Gennaro

[wacoc8]

That is a Wright cylinder.......for a tank engine. It is not an aircraft cylinder. Continental Motors built R975's under license during WWII for tanks. How would you like to cross Europe listening to that thing run......HUH? What ya say?

[exftrplt]

Ahaa.
What are your thoughts on using it on an experimental with a J-6? Or I guess a lamp base is a possibility.
Thanks for your help.
Gennaro