rsr mfi pump question

[giuliemma]

First of all I want to thanks Wayne and everyone ,pros in particular,that keep this great forum alive.

I was looking at a real rsr pump, that seems to have an oil inlet only,I mean no return to the crankcase
I supposed that all mfi pumps worked at a given internal oil level, as they have an orifice inlet connection and a full flow outlet connection.
possible that these simplified race pumps work in pressurized oil?
If it's like this why?
Every useful explanations will be appreciated
Tks Simone

[1972_911T]

The RSR oil pumps run in there own oil seperate from the engine, any MFI pump can run like this simply block off the supply and return and add a vent at the top of the pump to stop presurization.

Heres mine thats been recently rebuilt and modded to run this way



Steve

[giuliemma]

Tks Steve,
I knew every pumps can be run blocked off, Henry told me they use to do this,
the point is why genuine rsr pumps have the oil inlet only.
Note the inlet is located in the upper fuel casting and not in the usual production pump position.
Perhaps the pump is prefilled with oil while the plumbers body is kept pressurized or what?

Simone

[1972_911T]

Hi

The RSR pumps have a red plastic vent on the top of the pump if you take a look at mine that was done by henry mine has a cad plated metal vent, this is to stop the pump presurizing as it warms up. If the RSR pump was connected to a pressure fed oil line as you decribe oil would fill the pump and overflow out of the vent unless it had a return. Are you sure it was an oil inlet?

Steve

[giuliemma]

Hi Steve,

It seems to be an oil line for me.
What's your opinion?

Simone

[BURN-BROS]

Direct loss oiling. the oil is consumed by the combustion process. Not recommended for street use. Used to help problems associated with sustained high RPM races like Lemans.

[MPD]

The RSR pump uses a injection pump design similar to the Mercedes except for the two row V design. The pump has oil in the sump that is added when the pump is installed. The Mercedes pumps have a dipstick the RSR does not. The oil line feeds a passage that lubricates the plungers, the passage is sealed with 0-rings. No oil will go into the sump if the o-rings are good.
Also no oil is passed into the fuel that is injected, because of the pressure difference. Porsche or Bosch found that this extra lubrication was not needed on the street cars and it is overkill even for the race cars. The Govenor housing on the RSR pump is also from the same line of pumps as the Mercedes.

[giuliemma]

Very interesting info.
thanks alot
Simone

[seqfal]

guys, this may be impolite as i am not sure about the protocol, but can anyone advise what the correct Bosch pump\Governor assembly number for the rsr pump is, i believe i have an original 2.8 RSR pump but would like to confirm ?????????.Should i have started a seperate thread ???

mike

[MBEngineering]

HI Mike
"correct Bosch pump\Governor assembly number for the rsr pump is, i believe i have an original 2.8 RSR pump"

should be , Pump No' RV1668, Governor V1077 For a 2.8

regards mike