posted 4 years ago
If both pipe connections are near the bottom of the radiator, it will never promote a thermosiphon from heating the radiator mass. Even if the outlet of the radiator was at the top, I doubt you would get enough flow to be useful. But while the circulating pump is running, the radiator would be constantly moving heat away into the rest of the loop.
As long as the internal temperature of that part of the bell cavity is never above 212F/100C while the pump is not running, I think you will be fine, and get some useful heat into the rest of the radiator system. How close is the radiator to the combustion core?