Offenhauser Manifold

[robinj66]

I've got hold of a JWR Dual Port Offenhauser manifold for a Rover V8. Can anyone help as to what should fill the various holes.

At the front end is the hole for the thermostat [and I know that I have to use a modified housing with a take-off for the heater(?)] but am I right in thinking that the hole to the left is for the temp sender?

If that is correct, then what screws into the hole under the carb mounting plate - is that for a vacuum take-off for the servo?

And what goes at the rear - is it just a blanking plate or is it another heater connection? Any idea where I can get the missing parts.

All assistance gratefully received

Many Thanks

Robin

[craggle]

Hi Robin

Front will be for the thermostat and water pump bypass hose.

Screw thread in front should take the water temp sendor.

Under the carb would be a good place for the brake vacuum.

At the rear should be a plate with a tube coming out off it. The standard one off the SD1/ Land rover engine should fit. This then connects to the heater as the return pipe. The feed pipe for the heater comes off the top radiator hose on the water pump housing.

Hope that made sense.

Craig.

[russell_ram]

Robin,

You seem to have correctly answered all your own questions!

Front holes
The big one - thermostat. must have some kind of bypass -usually with a seperate pipe as you say - connects to rear of water pump.
The small one - engine temp sender.

Plenum feed to brake servo vac connection

Hole in rear face - feed to heater or blank of if no heater required. Return from heater into small pipe on water pump bottom hose feed (or into one of the two feeds on the pump rear face - depends on pump age/orignal fitment).

Source all these parts from any of the RV8 places - Real Steel (definately stock them) Rimmers, RPi, JRV8 etc.

As for the manifold itself - the Offenhauser/JWR is not really the racers choice as the ports are VERY small and further restricted by the splitter. However, I see it's secondhand so I guess it was cheap - in which case they're good for bottom end torque and drivability at the expense of ultimate top end power.

Russ

[osgood]

Originally Posted by robinj66

I've got hold of a JWR Dual Port Offenhauser manifold for a Rover V8. Can anyone help as to what should fill the various holes.

At the front end is the hole for the thermostat [and I know that I have to use a modified housing with a take-off for the heater(?)] but am I right in thinking that the hole to the left is for the temp sender?

If that is correct, then what screws into the hole under the carb mounting plate - is that for a vacuum take-off for the servo?

And what goes at the rear - is it just a blanking plate or is it another heater connection? Any idea where I can get the missing parts.

All assistance gratefully received

Many Thanks

Robin

Robin if you buy the thermostat housing from Real Steel with buy-pass splash out for the ally one MGB I think (not cheap!), don't buy there cheap cast one as it is porous and goes rusty weather you chrome it or paint it Osgood:angel: