Abstract: A device for slowing an internal combustion engine in the event of oil pressure failure at an engine speed above idle, includes an SCR with the gate thereof connected to an engine rpm sensor which provides a voltage analog of engine speed. The SCR is connected between an oil pressure sensing switch typically provided for the engine, and the ignition distributor points. Should the oil pressure switch close, indicating low oil pressure, and the engine is turning at sufficient speed so that the rpm sensor provides enough voltage to the SCR gate, the SCR will fire and short the ignition.

Abstract: A device for slowing an internal combustion engine in the event of oil pressure failure at an engine speed above idle, includes an SCR with the gate thereof connected through a resistor to the field winding of the engine generator. The SCR is connected between an oil pressure sensing switch typically provided for the engine, and the ignition distributor points. Should the oil pressure switch close, indicating low oil pressure, and the engine is turning at sufficient speed so that the generator field provides enough voltage to the SCR gate, the SCR will fire and short the ignition.

Abstract: An improved oil cooling system for internal combustion engines includes a pressure relief block which replaces the standard oil cooler of the engine, and a finned radiator depending from the engine sump plate in the passing air stream. The oil is pumped through the engine to the pressure relief block, where it passes a high pressure relief valve and is diverted through the hoses to the finned radiator. The cooled oil leaves the radiator, passes through a low pressure relief valve, and returns to the sump. The entire system may be bolted onto an existing engine with no modification to the engine required, to provide greatly increased oil cooling capacity. Further, the entire or substantially the entire oil flow must pass through the cooling system prior to passage through any pressure relief valves or the like.