RV8 Oil Flow

[Chassis 33]

Does anyone know what flow capacity the pumps in the RV8 run at?
Regards
Iain

[rev-erend]

No idea dor the early or the later serpentine driven pumps..

I believe the serpentine design pumps more than the earlier design and has better pressure too but for serious bhp some have said the design is not adaquate and that dry sump is the only way - especially if you are doing roundy round racing..

A baffled sump would be useful here.

[Chassis 33]

Cheers Rev, I'm just having a bit of a thought experiment at the moment into what I would need in terms of specifications to create an electric oil pump setup, and remove need for any mechanical pump what soever. The thing that has prompted is the difficulty in obtaining intermediate timing covers (ie crank driven pump and dizzy). It has another benefit in that oil could be circulated prior to firing the engine up and left circulating after shutdown to aid cooling. Fuel pumps would have an oil pressure cut off, to prevent the engine running with no oil pressure

Just a thought atm.
Regards
Iain

[rev-erend]

Chassis 33 said:

Cheers Rev, I'm just having a bit of a thought experiment at the moment into what I would need in terms of specifications to create an electric oil pump setup, and remove need for any mechanical pump what soever. The thing that has prompted is the difficulty in obtaining intermediate timing covers (ie crank driven pump and dizzy). It has another benefit in that oil could be circulated prior to firing the engine up and left circulating after shutdown to aid cooling. Fuel pumps would have an oil pressure cut off, to prevent the engine running with no oil pressure

Just a thought atm.
Regards
Iain

But you can buy brand new serpentine intermediate covers off the shelf..

I just bought one.

[Chassis 33]

Where? When I last built a serpentine motor (in 2006) I had to get one shipped from South Africa!?! Plus it would be an upgrade for pre-serp motors. Anyway like I said just a thought experiment...unlike some of my other plans
Regards
Iain

[stevieturbo]

I doubt there are any electric pumps capable of keeping an engine happy...nor would I risk one.

If you must, just fit a mechanical one remotely mounted, as per a dry sump type of setup, although with a wet sump of course.

[Howitzer]

I am pretty sure that there is a new Fiesta of some kind which uses and electric pump?

On our engines (Big 100 ton devices) with an electrical pump, we can just about get 0.6bar of pressure when warm and the engine not running, with the engine running on its mechanical pumps we see nearly 5 bar.

I would use a small pump in series to do a pre lube on start up but otherwise mechanical is the way to go.

Dave!

[900T-R]

Electric water pump - top idea. Should the elctrics ever fail, you've still got a bit of time before the coolant temperature reaches tea time.
Electric oil pump - sounds like a disaster waiting to happen without some serious redundancy in the electrical systems.

[Chassis 33]

All fair points, like I said it was just a thought experiment, and looking deeper into thinks probably a no-go.
Regards
Iain

[BIG DUNC]

Howitzer said:

On our engines (Big 100 ton devices) with an electrical pump, we can just about get 0.6bar of pressure when warm and the engine not running, with the engine running on its mechanical pumps we see nearly 5 bar.


Dave!

That sounds to me like the electric pump is only being used for pre-lub so the bearings etc are not completely dry when the engine starts. The pressure from the electric pump is not important as long as there is enough flow to ensure that oil reaches everywhere is should do. With this set up, I would expect the engine to have two mechanical pumps ( running all the time ) in case one fails.

I know of set ups on similar size engines, where there is only one main mechanical pump for when the engine is running, ( and an electric pre lub pump ).However, there is also an electric standby pump in case the mechanical pump fails. In this case, the electric stanby pump can easily produce as much pressure / flow rate as the mechanical pump. It just all depends on the size of pump and electric motor you want.

If you go to much bigger engines, there are no mechanical pumps, only electical pumps. Often there are different circuits, so say the cross heads will be getting oil from a 16 bar electric pump, and the main bearings, getting oil from a 4 bar electric pump. Then there will be different oil systems for turbo chargers, exhaust valve air springs etc. Engines like this may have about 40 tons worth of oil in the sump tank.....

Sorry chassis 33, not much relevence to a Rover V8 I know.....