Can anyone give me some info on this motor,does it have a model #,were they any good?
Its twin ball race with dykes ring has a very large venturi opening.
thanks
Paul
In OZ

Id used one in a clean 57 Oz plane , open Exhaust . on a 11 x 5 . Worked pretty good . steady rpm's . ' p ' head blew plugs though . ( stamp on front - same bowl / squish band  dimns as ST 40 & 46 . std.   )
Likes a drop of nitro , good tourque . well behaved .  Peak H.P. rp,s 16.000

here a road test of a series 70 R/C . Near identical dimensionally . http://sceptreflight.net/Model%20Engine%20Tests/K&B%2040%20Series%2070F%20RC.pdf
head in pic isnt the ' P ' ( Pylon ) that matches the Super Tigre 21 / 40 combustion chamber . & the Irvine 40 . Thats derived from these , he was the U.K. agent .
Piston Ring & gaskets amoungst other parts interchange . Were a hot Rat Race ( Grymzyph ) and the pylon motor before the sturdyer G-40 / X 40 super tigres .






Trans Atlantic Fame & Glory .  

The later model 4011 is a favorite stunt engine.  I have  a front end like yours, but have never put it on an engine.  I'd say start with an 11 x 5 and change props and/or choke down the venturi if you have a problem with wind up.