CP or CR engine

[simon.williams]

Morning! I have a nice shiny new metering unit from Moss.

I am not going to mess with the pedestal, but does anyone know if my 73 PI is likely to be CP or CR block? The notice says the timing is a little different.

I’m not touching it, but it may reassure me that the alignment of the drive dog is about right.

Thanks!

Simon

[johnnydog]

What engine no. prefix is it? Surely an original PI engine should have a MG prefix? Unless it's previously had a replacement CP / CR engine from a TR.....?

[simon.williams]

It’s an MG number, I assume the notice I got refers to TR6 blocks.

Anyway - new metering unit now in, new coil fitted, and so far so good! Smooth runnings for now!!! Very happy.

Changing the 20 year old balance tubes might have helped too…

[johnnydog]

A 1973 2.5PI with twin balance pipes between the throttle bodies (as in your photos) is likely to be a 125bhp unit rather than the earlier 132bhp. I understand the engine change was from engine no. MG75001.

[Charles H]

As Johnnydog says, yours is an MG prefix 125bhp engine. Trouble with Moss is they only really have TR5/6 knowledge. Likely to be similar to the CR engined TR6 though. Try talking with KMI Injection who are the people that do a lot of the re-building of fuel injection systems. Google them.

[simon.williams]

They reckon the pump sounds like its struggling to get fuel, so I need to check the filter and the pipes from the tank.