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plus 8 oil pressure relief valve #670267
31/10/20 08:57 PM
31/10/20 08:57 PM
Joined: Sep 2016
Posts: 568
Chester, UK
Grumpy2 Offline OP
Talk Morgan Regular
Grumpy2  Offline OP
Talk Morgan Regular

Joined: Sep 2016
Posts: 568
Chester, UK
I don't have a problem but something I've wondered about.

My oil pressure is fine, approx 15psi on idle and 30-40 psi when running. Drops a fraction when things are very warm in summer on a hot day.

I've had lots of Rover V8 engines but never one with the high pressure relief valve spring fitted.

Has anyone experience of the high pressure relief valve and what was the outcome.

Just looking for things to do during 'lockdown lite/lockdown two' after I've fitted the indicator repeater buzzer.

cheers


94 plus 8 in Westminster Green - I think!
Re: plus 8 oil pressure relief valve [Re: Grumpy2] #670339
01/11/20 11:23 AM
01/11/20 11:23 AM
Joined: Feb 2016
Posts: 3,424
East Harling, Norfolk UK
RichardV6 Offline
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RichardV6  Offline
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Joined: Feb 2016
Posts: 3,424
East Harling, Norfolk UK
Don't all pressure lubricated IC engines require a pressure release valve even if incorporated within the pump body? This to alleviate high pressure from cold oil, strain on pump and seals etc.

As an aside read an article the other day suggesting a rule of thumb of 10 psi oil pressure for every 1000 rpm of crank rotation up to max 60 - 70 psi.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
Re: plus 8 oil pressure relief valve [Re: Grumpy2] #670384
01/11/20 05:28 PM
01/11/20 05:28 PM
Joined: Sep 2016
Posts: 568
Chester, UK
Grumpy2 Offline OP
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Grumpy2  Offline OP
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Joined: Sep 2016
Posts: 568
Chester, UK
Yes Richard, but the V8 runs low oil pressure but at a high flow rate. Theres a fairly common mod that increases the pressure a tad by fitting a higher rated relief valve spring.

Although its a well know mod I've never come across anyone with direct experience to ask if its worth doing

Standard V8 oil pressure is approx the same as mine so I'm reluctant to go fiddling unless theres some benefit that I dont know of

cheers


94 plus 8 in Westminster Green - I think!
Re: plus 8 oil pressure relief valve [Re: Grumpy2] #670395
01/11/20 06:29 PM
01/11/20 06:29 PM
Joined: Feb 2016
Posts: 3,424
East Harling, Norfolk UK
RichardV6 Offline
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RichardV6  Offline
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Joined: Feb 2016
Posts: 3,424
East Harling, Norfolk UK
Sorry misunderstood your first post. I do have a dry sump vintage diesel with adjustable external PRV incorporating non-return valve to offset wet sumping when not running. The adjustment which pre-loads main spring has almost no effect when oil is warm though.

ETA: found these pressures as good for a rebuilt pre serp. engine after which (around '94) oil pump drive was taken from crank rather than distributor shaft.

1000 rpm = 10psi
2000 rpm = 28psi
3000 rpm = 32 psi
4000 rpm = 38 psi
5000 rpm = 40 psi

Sounds like your engine is not far from rebuilt findings and as you suggest the high flow rate offsets the need to strictly adhere to the rule of thumb I mentioned.

Last edited by Richard Wood; 01/11/20 06:47 PM.

Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom

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