The whole "dwell time in the radiator" theory is bs... more water flow = more cooling. That said, I run a tstat in my racecar - without one my engine runs too cool in the spring/fall. I run a 180Âº high flow from robert shaw - I drilled a couple extra holes in it too as I do not run the bypass hose. Seems to work well, this past weekend was a real test as we were racing in 104Âº weather...
forgive the cut and paste from the other thread,
but to set up the question (in red, below) :
how much do the underdrive pulley's hurt?
i have steeda 25% iirc
no heater, no a/c
pure water, with one bottle water-wetter
road race car,
big fluidyne radiator, (not yet boxed in)
and no air dam floppy thing underneath radiator,
was hitting 240*F at road atlanta in june, so i bailed halfway through the race,
i had JUST replaced the motor, after throwing a rod there in march,
so i wasn't ready to RE-replace a motor.
sunday morning, we made a small faux-airdam from 2 ply of a rubbermaid garbage can
(don't ya' wish EVERYTHING was made, like rubbermaid???)
i saw a 20*F drop from just that, and it was only ~3.5" tall, and JUST as wide as radiator
so the guy who did my motor swap, owns his own shop,
when tuning the new engine (c-head swap) i saw a 10 degree difference between the datalogger, and my autometer gauge.
i forget which was higher,
if both sensors were at about the same place, seems like they'd be about the same temp, (instead of 10*F different).
do the 98's have different locations of the TWO sensors??
my engine swap, involved a long block from an 05 aviator,
hence the c-heads.
i wonder if those 4.6's had a bigger difference in the two sensors?
has a fox body stang with a $28,000 chevy ~582 c.i.d, which runs in teh 7's on motor,
and in the 6's on nitrous.
so i FIGURE he knows what he is talking about.
yes, i know drag racing is different from road racing,
and THEY can run with epoxy in their water jackets, and NO radiator, etc, for a short run.
when he put in my fluidyne,
instead of a cooler thermostat, for which i asked,
he put in a "flow restricting washer"
while discussing it, he was saying "if it still runs to hot . . ."
i interrupted by saying " . . .put in a less-flow-restricting-washer"
he corrected me by saying "NO. Put in a MORE-flow-restricting-washer, to slow water through the radiator" (ed's "dwell time")
i thought, hmm, maybe that makes sense,
ed apparantly says BS,
what to do??
how much does THIS part of my cooling (or lack there of) puzzle explain my temps on saturday and sunday in june??
car is a 98 cobra,
as above with an 05 c-head aviator 4.6 mod motor