radial cylinder identification can you help ?

many thanks

just to say thank you for your help so far, got to get that tape measure out and do a little checking.
I will let you know how i get on.
regards, Paul. 🙂

Definitely P & W

If you measure the internal diameter you should find one of these sizes:
5.1875 inches – means it’s R-985,
5.5 inches – means it’s R-1830,
5.75 inches – means it’s either R-1340 or R-2800, as Dave Barrell suggests, if you can determine the stroke(piston travel) then you can tell which: R-1340 had a stroke of 5.75 inches, and the R-2800 had a one of 6 inches exactly.
You may also find the bore very slightly oversize from these numbers, in multiples of .010 inches

Chiron

If the internal surface is good enough, see if there are any witness marks as to how far the piston came down the bore – then measure the bore and the stroke, a quick calculation gives you the swept volume of the cylinder, multiply by the amount of cylinders (9) and you should get either a 985 or a 1340 displacement (whatever their respective displacements are – usually measured in cubic inches)……

might be a wasp, needless to say a bigger pic would help..

Alex

Looks like a 985 to me which in turn looks like a 1340!

(P&W WASP, P&2 WASP JR)

GEE DEE P&W Junior I think?

Looks pretty similar to the attached

http://www.enginehistory.org/pima.htm

Martin

Mr Moonshine, I think they are most likley off a Pratt and Whitney R-1340 Wasp from most prob Harvard or Beach type aircraft they were used in many other types as well.