You can still do a compression test.
That will tell you a lot.
However with out a bell housing on the engine, I'm assuming there is no way to mount the starter.
At any rate, you will have to find a way to mount the starter weather you just do a simple compression test or run the engine.
If the engine is still in the car, the compression test will be easy.
As Mike said, the crank sensor for sure, the ECU needs that to get the spark and injection timing.
If there is a cam shaft position sensor, then it should be hooked up as well, but will run with out it.
Same for the MAF (mass air flow sensor) OR MAP (manifold absolute pressure sensor).
There will be a coolant temp sensor too, so the ECU knows to keep the injectors open longer for cold start up.
Your oil pressure sender may also have to be hooked up as well.
Some designs in the ECU will look for oil pressure so it will start/run.
Don't know if Rolls Royce did this.
If the fuel injection system is of the return-less type, then that's fairly straight forward to hook up.
Early fuel injection systems had a fuel return line, so requires more plumping to hook up.
Throttle position sensor _ will run with out it though.
Air intake charge temperature sensor _ used for cold start _ tells the ECU the ambient air temperature _ should start with out it though.
This will be found in the air intake tube after the air cleaner, or somewhere, where the air flows into the engine.
Shouldn't have to worry about the oxygen sensors, they won't be used on start cold start up.
Don't run the engine for more the 2 minutes, a minute and a half is better.
Will over heat and ruin the engine.
You can hook up the coolant system with a 5 gallon pail of water and hoses if you want.
It will take the engine a little while to heat that volume of water.
IAC (idle air control valve).
There are other names for it.
It will be mounted near the throttle plate.
The ECU controls the idle with this on cold start, it will be wide open at first start.
The car will run with out it, but you have to keep you foot on the gas peddle so the throttle plate stays open.
Thankyou very much for that information.
The transmission and bellhousing are still fitted to the rear of the engine along with the starter motor, so no problems there. I intend to drop the front subframe to remove the engine and transmission together I am sure this will be the easier option. The car that the engine is going to to be fitted to is a Silver Spirit (!983) which has thrown a connecting rod through the side of the block at 330,000 miles. I have already fitted all the doner Turbo R suspension and front and rear anti roll bars to the Spirit and if the Turbo R engine proves to be good, which I suspect is, then I will fit the Turbo R diff as well.
Are the crank sensors mounted at the rear of the engine, near the flex plate? and the coolant temperature sensor on top of the thermostat housing? I know this is a major project being that the Spirit is carburated and has no fuel injection so much wiring to do on the Rolls!
I have also discovered that the Bentley firing order is very different to the Rolls engine. As a last resort, could the Rolls inlet manifold and carbs be fitted to the Bentley engine, without the turbo? I know the compression ratio is lower by a point over the Rolls engine but I cant see a problem with that.
What are MLS head gaskets?
The next thing I shall need is a 89 Turbo R wiring diagram