Discussion
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.
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.
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
Just a thought atm.
Regards
Iain
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.. Just a thought atm.
Regards
Iain
I just bought one.
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!
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!
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.Dave!
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.....
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