From: Stuart Ulph
Date: 13 Oct 2002
Time: 07:00:16
Remote Name: 193.237.136.145
My Ulster engined blown special has a mid 60s straight tube rad. On a hot day in summer, 5000 rpm in top up the two mile hill on our local bypass results in 95C. dropping to 87C after a half mile on the flat at 4000. Seeing positive press. on the boost gauge translates almost instantly into a higher engine temp.
On back roads in February (winter!), rarely exceeding 4000, it's definitely overcooled, hovering about 70C. A strip of card in the rad aperture sorts this.
Trying to think about the pump pushing the water round too fast hurts my brain! Will it be a Good Thing because any given increment of coolant is exposed to airflow in the radiator more frequently? Or a Bad Thing because it has no time to suck the heat from the power unit! Project no. 99 is a blown engine with (initially) no water pump so I will find out eventually. At present rate of progress, not for some years...
Meantime I continue to try to gain more airflow through the engine bay because my feet get very hot in summer. Full under tray really doesn't help.
Regards, Stuart