Bottom radiator hose early vs. late

[Layne]

What's the difference in the bottom radiator hose before and after 10/73? (Early = 11 53 1 251 520, Late = 11 53 1 266 462). I have the Ireland silicone hose kit (supposed to be the late style) and the bottom hose doesn't seem to fit very well. I suspect the difference must be in the radiator? The radiator is new and I have no idea what year it's intended for. The engine is an M30B34 but the connection there is always the same as far as I can see.

 

[sfdon]

You might just need the correct one.. is this motronic upper timing cover?

http://www.realoem.com/bmw/enUS/par...3CSi&mg=11&sg=35&diagId=11_0690&q=11531268750

 

[Layne]

Yes it's motronic. Makes sense that the hose would be different to go around that, but why would the hose change in 10/73, almost 10 years before motronic existed?

 

[HB Chris]

The 74 rad got the sensor bung down there, maybe that is it.

 

[Layne]

I see now that the motronic is my problem, a carbed thermostat housing points downward at a different angle. So whatever change occurred in 10/73 is irrelevant to what I'm doing. I'm going to try buying an E28 hose and chopping the bottom elbow off of it. I assume that's what the other motronic guys are doing. If it were complicated, there would be details online somewhere.

 

[Layne]

You might just need the correct one.. is this motronic upper timing cover?

http://www.realoem.com/bmw/enUS/par...3CSi&mg=11&sg=35&diagId=11_0690&q=11531268750

Oooh I see now that you linked me to the correct 1982-only E24 hose.... I bought an E28 one but cutting the elbow off the bottom won't make it work (I didn't actually cut it ). Gotta order this one now.