Vintage FROG 80 Model Engine

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Circa 1957

Design History:

Designed and manufactured in Britain in 1957 it was a direct descendant of the Frog 50 which had up to that time achieved a high degree of popularity. 

Design Features:

conventional reverse-flow scavenged crankshaft front rotary valve (FRV) ;

Over square chamber design;

Twin exhaust stacks;

Case hardened steel cylinder liner with integrally-machined cooling fins;

Iron piston; and

steel counter piston with a flange limiter at the top and an O-ring seal.

Specifications:

Bore 10.16 mm;

Stroke 9.91;

Displacement 0.804 cc;

Weight 54 gm;

Max power .051 BHP

Maximum speed 11,000 RPM

Observations:


Uploaded by valic000 on Feb 26, 2012
Today I like to show another lovely little diesel.Its the Frog 80. This engine from my growing collection is in superb condition. In fact its 55 years old but in like new condition. Its untouched in all those years. No marks on the screws, a very smooth feeling when turned by hand. It feels almost like a ball bearing version. Also very strong compression with zero play anywhere.
The Frog company made a lot delightful diesels in the past. In my opinion also they made really lovely engine castings too. Lots of attention to details, with superb finishes.
I have 4 frog engines and there are all very well made. Still must run the 3,5 BB diesel engine. And that must be a real screamer. It looks very powerful to me. I hope to run him soon here on my channel. Subscribers are always welcome.Thanks for watching,I hope you like it...and more lovely old engines on my channel!

http://youtu.be/kfmajqUpmCk

This posting is prepared in collaboration with YouTube Channel valic000 Visual material and observations are by valic000