Valve sizes were increased, and the camshafts had slightly increased lift, but with shorter duration.
The camshaft included two sets of cams, one for full takeoff power, and another for economical cruise.
It was a 589 cuin flat-6 cylinder with hemispherical combustion chambers, fuel injection, and overhead valves operated by oil pressure rather than a camshaft.
The overhead camshaft is driven by a vertical shaft through bevel gears, which also forms the armature of the dynamo.
A subsequent redesign used bevel gears to drive a vertical camshaft, operating the valves through rockers.
The engine featured double overhead camshafts, driven by a vertical shaft through bevel gears.
A bevel gear at the junction drove a vertical shaft from which the single overhead camshaft and dual magnetos for each bank were driven.
In 1909 the two-speed singles had camshafts to open the inlets, instead of the earlier automatic valves.
