A few 4 cylinder engines....

[Vincent.vanGinneke]

For fun, a few lesser known prewar 4 cylinder engines.

above, Prototype 248cc 4 cylinder 1934 British. What happened to this one-off ?
Looks like a chain driven OHC with a oil cooler up front.

Dollar with Chaise 4 cylinder.

above 500cc Motobecane. Carb sits ready to suck up any small furry animals thrown up by the front wheel

French Train with 4 cylinder OHV with outside flywheel.

[adrie.degraaff]

In the first "THE MOTORCYCLE" magasin where these monstrosities of wich they think had to much horspower (16 HP).
Was this the first V4 motorcycle ever made?

[TonyBaxter]

Brough, seen at Montlhery in 2022, prototype with MAG engine, never made it into production. After teething troubles with the crankcase, this one has a wooden crankcase. No, you didn't misread that!

[Vincent.vanGinneke]

Should be doable nowadays to get a crankcase cast.
Brough owners usually have the pecunia

[TonyBaxter]

Should be doable nowadays to get a crankcase cast.
Brough owners usually have the pecunia