Thread: P76 crank

I know the 4.4 main journal is larger than a 3.5/3.9 and i'm guessing that the 4/4.6 is the same size.

I have a leyland terrier V8 in my landie which has an upgraded crank to the P76 but same block. I do know you can modify the Rover block to take the crank but I don't know the measurements. The rear main oil seal is larger. I have a Rover V8 flywheel re drilled to fit the leyland crank to be able to use the rover V8 Clutch. I also had to machine up an adaptor to fit the spigot bush. The rods and pistons you would have to source some used in a 4.4 stroker kit unless you can find the rare 4.4lt Rover V8. If you don't have a problem with ADR 36 or 22A (emmision rules) fitting the leyland engine isn't hard. The only problems being the cylinders are longer and the rover inlet manifold doesn't fit without adaptor plates and the ancillary brackets may not line up. Mine has rover heads, EFI inlet manifold and timing cover. This conversion is well worth it. The amount of grunt my truck has is awesom

I've got a complete P76 motor and my initial thought was to fit that but it's just too tight in my forward control without significant mods. I have a 4.0 block ( 94mm bore ) which if my maths is right with the P76 crank would give close to 5 litres if and its a big if I can find a combination that works without just buying a 4.6 crank,rods/pistons which share the 94mm bore. Looking for more torque so I can change the diffs to get higher road speed.

One option, P76 crank reground mains & counterweights to fit rover block.
Rover rods, bore small end for ford pin.
Ford 250 pistons (3.685" from memory) +.020" deep dish

Ends up about 4.9 litre. High compression.

Note: pistons are not all that good, but there might be some aftermarket versions that are stronger.

Don't know how much it would all cost, may be cheaper to get the 4.6 stuff.

Originally Posted by Dave Jump

Does anyone know how the p76 crank journal size compares to the rover cross bolted block ( 4.0 / 4.6 ). If it fits what combination of rods / pistons work? Cheers

G`day ,

... approx figs ...

4.4 mains 2.5495
Bigs 2.0
Wrist .8750
Rod c to c 6.250

4.0 mains 2.500
Bigs 2.185
Wrist .9449
Rod c to c 6.111

4.6 as for 4.0 other than Rod c to c 5.897 ( not a mistake 4.0 has longer rod )

Weights may clear ok because 4.0 and 4.6 are internally bigger ( shorter liners ) than 3.5/3.9

Cheers

A 4.4 crank is massive against a 3.5. I machined up a 4.4 crank to fit in a 3.5 block and started to take the rover mains out to 4.4 size.Then you have to try and balance the crank up after machining so much off the balance weights. In the end i just put in a 318. It may work better with the bigger rover 4.6 block

Originally Posted by Freestyler

I have a leyland terrier V8 in my landie which has an upgraded crank to the P76 but same block. I do know you can modify the Rover block to take the crank but I don't know the measurements. The rear main oil seal is larger. I have a Rover V8 flywheel re drilled to fit the leyland crank to be able to use the rover V8 Clutch. I also had to machine up an adaptor to fit the spigot bush. The rods and pistons you would have to source some used in a 4.4 stroker kit unless you can find the rare 4.4lt Rover V8. If you don't have a problem with ADR 36 or 22A (emmision rules) fitting the leyland engine isn't hard. The only problems being the cylinders are longer and the rover inlet manifold doesn't fit without adaptor plates and the ancillary brackets may not line up. Mine has rover heads, EFI inlet manifold and timing cover. This conversion is well worth it. The amount of grunt my truck has is awesom

Hello, first post on this forum.

Could you tell me which is the difference between Terrier crank and standard P76 crank ?

I heard that Terrier crank is forged and P76 crank is cast. It is true ?

Thank.

Cheer.