BRENDA 4

FLAT FOUR OHC ENGINE

Brian Rees

Model Engineers from around the UK have been following the progress of this remarkable engine at exhibitions as far apart as Doncaster and Guildford, and in 2019 was awarded the ‘Sir Malcolm Campbell’ trophy for his new flat four I/C engine by Sutton Model Engineering Club. Sir Malcolm was their first President and this is their highest award. The engine capacity is 28cc. It is 200mm long; 250mm wide, and 220mm high. It has a compression ratio of 8:1; the fuel is methanol, and as can clearly be seen above has gear driven cam shafts.

It has been machined from a number of materials, mostly on Brian’s Sherline lathe, including the gears. The crankcase couldn’t be more than 90mm long.

The photo above shows the oil pump fixed to the front timing cover, with all the pipe-work. Camshaft bearings are under the brass cover plates.

This is the Rear/ Drivers side, with switches for ignition and fans, each with their own volt meters. There is also a rev counter.

The 90mm flywheel has a hexagon for starting.

The CDI (Capacitor Discharge Ignition) ignition pickups are on the end of each camshaft, together with magnets in the rotors.

This is a close up of the front cover, showing one of the four 40mm square computer fans.

The photo shows the brass drip tray and plastic sheet protection from oil leaks!

Bought items include the CDI units, spark plugs and carburettor.

 
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