Offroad-Express

I've been wanting to give the rangie a bit more power so after a bit of research best bang for buck and ease was a 4.4l P76 there pretty cheap compared to a 4.6 with a bit more torque. A carbed p76 is 192hp @ 4250rpm and 421nm of torque @ 2500rpm and the 4.6 is 225hp @ 5250rpm and 395nm of torque @ 3250rpm.
In order to fit the 3.9 injection spacer plates between the intake manifold and heads are needed, the Rover flywheel needs to be re-drilled to fit the P76 crank.
I put a 1998 Discovery front timming cover on with the crank driven oil pump so oil pressure is far better and have also put the Serpentine belt system on. In order to fit the cover the keyway on the crank has to be lengthend.
I put 1995 Discovery heads on as they have bigger valves than the P76 heads, the other difference is Rover oil the the rocker gear through the heads and Leyland oil the top through the pushrods some seem to think you need to drill oil galleries in the block in order to fit Rover heads but you dont the Rover rockers oil fine through the Leyland hollow pushrods.

Hi 91 Rangie,

Looks like a great setup and a similar engine to what I've been thinking about building. Though the p76 is for the boat not my 90!!

The current p76 is a little low on compression and the Holley on top just annoys me so I'm keen to sort both problems out.

How does the fuel injection go? Does it ever lean out or can the standard ecu keep up with it?

I was thinking along similar lines as getting hold of a set of 3.9 heads and injection shouldn't be to tough. Then it'd just be down to choosing a good cam.

Do you know if the mustang injectors are a higher flow injector?

Cheers

There 19lb injectors and have 4 spray nozzels instead of 1 like the Land Rover ones. Havent taken it for a good run yet as the centre cross member is out so the exhaust will fit. Its getting a new exhaust system fitted on Monday.

so are the injectors you put on more high flow and bigger? i have a 5.0 but its still got standard injectors and we are going through the process of bigger everything to do with airflow so now we need more fuel

cool__bananas wrote:so are the injectors you put on more high flow and bigger? i have a 5.0 but its still got standard injectors and we are going through the process of bigger everything to do with airflow so now we need more fuel

Cant find the sites with the info im sure google will have the answer

where did you get the spacers for the injection to fit the p76?? cheers karl

ToyRover wrote:where did you get the spacers for the injection to fit the p76?? cheers karl

Trademe

howat engineering in welly makes them

so how did it all work out? can you give a update on performance etc?? any other teething probs? looks like a great conversion.

got some footage of this in action??

diffsx2 wrote:so how did it all work out? can you give a update on performance etc?? any other teething probs? looks like a great conversion.

gary_in_nz wrote:got some footage of this in action??

Nothing yet as still trying to sort the cam out.
Seems the cam is a reground standard one I never accounted for this so its not opening the valves enough not going to play around with longer push rods and rockergear etc.
So Im getting a new billet cam for lpg for it
Exhaust was done but is far too loud so its going back to get redone