Rover 3500 V8 Oil Pressure Dependant Ignition

[tonym]

An override spring switch for when the engine is hot, to override your system for overriding the fuel pump if there is no oil pressure.........

[skinnymathew]

An override spring switch for when the engine is hot, to override your system for overriding the fuel pump if there is no oil pressure.........

An override override. I like it.

[Eggbert]

I just run without a choke. When cold, it cranks long enough before it fires to get the oil circulated. When hot, it doesn't matter as oil will already be everywhere.

Not so easy on the starter motor though....

By the way, I understand not wanting to put a load on your engine until some oil has circulated, but I doubt it's a problem. I've taken engines apart that havn't run for a couple years and the journals were still wet with oil.

[TonyD]

This is probably a good idea in an accident situation whereby if the engine stops so does the fuel pump. This would mean that if the tree doesn't move out of the way fast enough at least you don't sit there with the engine in your lap listening to the fuel pump disgorging 12 gallons of unleaded into the footwell. That would definitely ruin your day.

[Sumocobra]

Hi,

Have you thought about using an inertia switch to cut the pump out in the event of a bump? I lifted one from an old Citroen Saxo and fixed it to the Chassis next to the fuse box/ relays so it can be easily reset if required.

They are availble both new and old from eBay sellers.

https://www.ebay.co.uk/itm/254538535443

[Chris1]

Hi,

Have you thought about using an inertia switch to cut the pump out in the event of a bump? I lifted one from an old Citroen Saxo and fixed it to the Chassis next to the fuse box/ relays so it can be easily reset if required.

They are availble both new and old from eBay sellers.

https://www.ebay.co.uk/itm/254538535443

Nothing wrong with that idea,
it would be a straight forward simple job to do .
As I mentioned before, my RV 8 engine is dependent on
oil pressure to run but if someone wacks into you that will
not necessarily stop the engine.
I have an inertia switch sitting in my garage that I have
been meaning to fit .
I will get on and fit it !
Chris.

[skinnymathew]

I installed the Fiat Panda inertia switch, plus audible alarm to alert me to it being triggered, when I replaced the mechanical fuel pump with an electric one.

I've now installed the override override mentioned previously in this thread so that I can still start it when the oil is hot and it's more difficult to achieve the minimum oil pressure just by cranking, but the engine will cut out if the pressure drops, even of the carb float bowls are full.

[jon1d]

What about a cut of of fuel in the event of an engine bay fire . To often I see fuel being being ignited by hot exhaust manifold.

[Chris1]

What about a cut of of fuel in the event of an engine bay fire . To often I see fuel being being ignited by hot exhaust manifold.

You could utilise a smoke alarm to shut off the fuel via a relay,
although it could be shutting you down due to normal under
bonnet fumes .
It could be tweaked to be less sensitive, this is just a thought.
Chris.

[cperry]

How about some sort of timer, so it starts as "normal" then after 3 seconds of running it looks for the oil pressure to maintain ignition?

Maybe you could you use (delay on or delay off) relay??

https://www.12voltplanet.co.uk/adjus...f-12v-10a.html