I was wondering if a radiator can be mounted upside-down.
The radiator I'm using is a rad without "vent" cap, it's meant for a S6 RX-7, which uses a closed rad, with a separte air-seperation tank.
I'll be using this in a S2 RX-7, and it will fit better upside down. As far as I can see, there can't be any problem here, as it shouldn't make a difference (top hose becomes bottom hose, that's all)
Apart from the fact that draining is no longer possible through the drain plug, but my old S2 rad didn't even have drain plug.

I cant think of any problem

yep, i mounted a granada MKIII radiator upside down in my old capri and it was fine.

[Edited on 14/9/07 by saigonij]

Yep
Pilgrim Sumo uses Sierra rad upside down.

ok, then it'll go in upside down. I couldn't think of any problem myself, but wanted to be sure.