The Elfin 1,5cc mkII BB story - aprox.1956

Welcome once again.Today I dive in the Elfin bb engines.The Elfin had a very good name in the past because of the very wel running plain bearing engines.And they had a exelent power to weight ratio.And with super fittings and finish...you got a engine ikon. I was check out the story,and there was a lot to read. The most stuff is shortened in the clip. Its a unusual shape,but wel build engine. The only limit was the reed or clack valve like the british say. A engine running at 13000rpm means the membraan must move 26000 times1 (open & close cyclus). The reedvalve was maeby a copy from the cox engines,but It was also a source of troubel.If the membraan get dirt of a smal crack,the engine wil have quick troubel,If start at al. But later the Jena,Taifun ,Frog and E.D. proof, that the problems can be solved.Just use a fine mesh to prevent dirt come in,and make the valve stronger,so it wil last longer....and you keep a outstanding engine!The engine I run in the clip spins a 8x4 apc prop.Its actually to big,and the compression is less. But with a new piston and a 7x6 prop he shoud run arround 13000 rpm.Wil be continued... Many thanks for droping by... Soon moore here..Coments welcome,and check my other clips too,If you like model diesel engines!