I tried one of the Moroso accumulators on our rock crawler with a 350. I originally thought that I needed to maintain oil pressure during extreme angles.....I took it off because there was no apparent change (although it was tough to watch the oil pressure gauge when you're about to roll).

The thing works good to precharge the engine on startup, etc. For you idle idea, you need to find out how much oil passes the pump in a given time. The Moroso accumulator only holds two quarts so it wouldnt support a very long idle period.

mike in tucson