When I replaced broken radiator with a Mulfab alluminium one, I noticed a drop in the cooling water temperature. This must be because the Mulfab one being made from alluminium and being larger. As I did not like the esthetics of the new radiator sticking out from below the front, I got a stubby valance from Wolff Engineering, to cover it up as well as to get some extra protection. Result is that the running temperature is slightly up again.
In order to lower the under bonnet temperature, I installed bonnet extenders from John Taylor. This also provides some extra free volume around the itg air filter, which should help breathing. An additional bennefit is the increased sound level from the air intake.

I wonder if closing the gap at the bottom between radiator and front of engine (as mentioned earlier in this discussion) would be of additional help to help both air intake temperature and flow (given the bonnet extenders).
Cheers,
Bert


2025 Plus Six - 1909
2009 Roadster
1983 4/4 4str
Board member Morgan Sports Car Club Holland ('21)