Thanks GB indeed model engines are interesting. That Webra was a contemperary of the Saito .45 but somehow it was very lethargic especially when compared with a fourstoke .60 OS. least that was my perception of it.

It flew that Bristol very poorly you know whats the word? Prototypically, gotta love that word I later replaced it in the Bristol with a Magnum .80 (another orphaned engine) and it came alive and enjoyable for several more years untill I did something stupid RIP.

You got me fired up and I made another set of pics that I wanted to show comparing the Webra T4-60's carburator throat right next to the venturi of Contemperary Saito .45s carb throat. The Saito's is darn near twice the throat volumn.

Hmm suppose this has got something to do with the Webra being so weak or at least a part of it?
Ah Ha I'd bet that also has sumptin to do with the webra starting and running so easy. Heck maybe it was so darn smooth because of a lack of all that reciprocating mass.

I agree with you chuck just about every engine imaginable has been homebuilt by folks with extrodianry skills, they are amazing.

Sorry for the hijack JollyPopper, Oh don,t ever stop being curious its what keeps us alive[8D]

John

Oh that big hole at the top of the webra in the back is the exhaust port and you can see the valve can in there. A large threaded disc threaded in the big hole and it had a tiny little exhaust pipe.