OHC vs. OHV Diesel Engines: Car Comparison | Posts 16+

Jens 16syncro wrote:

I have both design principles for driving camshafts in my own possession. OHC with timing belt: VW 1.9 TDI with VT-ESP and 2.0L gasoline engine (all using the 827 engine block). OHV engine with spur gear set: Volvo B30 (3.0L 6-cylinder gasoline engine). Whenever I look at a Volvo B30 engine, I always wonder what advantage an overhead camshaft actually provides in a diesel engine. ... What makes Overhead Camshaft (OHC) engines appealing in diesel applications?

"One argument is still missing: The OHC (Overhead Cam) design is stiffer, while in the OHV (Overhead Valve) configuration, the pushrods and rocker arms act as elastic elements between the camshaft and the valves. To prevent the valve drive from entering resonance within the engine's operating speed range, which could cause the valves/springs to vibrate at their resonant frequency, the springs in the OHV design must be stronger to keep the resonant frequency outside of the operating speed range."

Quote:

By the way, I know of an engine that comes quite close to my ideal concept: Toyota 12H-T 4.0L inline six-cylinder engine, overhead valve (OHV). TUE, Turbo, Inline-ESP. Unfortunately, it's more of a truck engine and therefore much too large and heavy

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*fun mode activated*
2 cylinders amputated --> dream engine.



*Soaßmode off*

If I may ask a question, where do you primarily drive off-road?