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Forum sponsored by Allendale Jan 24th

Limiting pressure to a gauge

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Tim Stevens20/10/2019 15:43:26
1155 forum posts

I suggest hat the only problem you might have (apart from bending the innards of the oil gauge) might be an overload of the pump drive gears. This depends on how well engineered and how substantial they are.

But I keep asking myself - this engine has been rebuilt to something like the original, but surely the original would not have over-burdened the oil gauge as it now does? Perhaps if the oil pump has been rebuilt, the new parts are a better fit, etc? And perhaps an unnecessarily better fit?


Tim Stevens20/10/2019 17:26:22
1155 forum posts

I've had a further thought about my claim above [every four-stroke ...]. One or two engines did not have a PRV - they were engines without plain bearings - rollers or balls everywhere. Examples include Manx Norton and Ducati singles and twins. In these engines, the major volume of oil is directed at overhead camshafts, from whence it flows over the head and takes lots of heat away to the sump - or separate oil tank.

But that sort of engine is not what we are considering here.


not done it yet20/10/2019 18:06:56
4472 forum posts
16 photos

The last VE post says enough - it was an experimental engine.

I have a Wisconsin VE4 engine that simply sprays oil around the required areas of the engine and so would not require a PRV. It does not have an oil pressure gauge of any description. A blocked big end spray nozzle might be the death of the crank - while still registering the low running pressure. I don’t think the roller-bearing mains were lubricated directly, just relying on oil splash, even though it revs to 2200rpm.

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