2.25/2.5 Diesel Oil Pumps ?

My hybrid 2.5 diesel is up and running.
I've covered about 500 miles so far and all seems well.
Basically I've taken an ex MOD 12J engine and chucked away the belt drive timing cover etc, and retrofitted a chain drive timing system, along with the series type injection pump mounted vertically on the block.
Now I've fitted a nearly new series type oil pump in the sump.
I've still got the 12J oil pump, which has a braced pickup filter, sitting on the workbench.
I just want to know if Land Rover increased the capacity of the pump when they went to the 2.5 litre engine ?
The 12J seems to have oil jets fitted to the underside of the main oil gallery, presumably to help cool and lubricate the lower bores and piston skirts.
It's been suggested to me that the oil pump was uprated to keep up the oil pressure.
Anyone know if that's true ?
Now I did have another series type oil pump somewhere, to compare with the 12J one.
If only I could find the damn thing.

It would have made sense for LR to uprate the oil flow in the 12j unit as it was soon to be the 19j turbo where cooling would be an issue. [ LR have a history of doing upgrades a bit at a time] Having the two pumps and running them on a bench for a set time is the only way I can think to know.
Like your idea of retro fitting chain drive.

tottot said:

It would have made sense for LR to uprate the oil flow in the 12j unit as it was soon to be the 19j turbo where cooling would be an issue. [ LR have a history of doing upgrades a bit at a time] Having the two pumps and running them on a bench for a set time is the only way I can think to know.
Like your idea of retro fitting chain drive.

Click to expand...

I'd expect to find the oil pump gears and body simply lengthened by the required amount in order to give the increased capacity.
Cheapest way to upgrade a pump, as all the other dimensions remain the same.
Of course if you took it to extremes, like double the length, the gears would start to bow under load, probably causing premature wear or even a seized pump.
Would have been easy to check before I built the engine.
Now it looks like pulling the sump