Cooling Upgrades Techie Question
Good Day!
Why are dual thermostats part of the cooling mods?
If memory serves, the cooling upgrade GM introduced to our beloved 6.5TD in 97 (?) includes a higher-output water pump (85 (?) gpm to 130 gpm) & a new, dual thermostat housing. These components are fortunately available for retrofit from several top-quality DP advertisers.
Again from memory, this upgrade increased flow through the block ~ 75%, & flow through the radiator ~ 9%. This makes sense, as some of the cylinders (6 & 8?) seem to fail from overheat before any others; it seems like increasing coolant flow through the block might stop this problem.
My question comes up because if flow through the radiator is only increased ~ 9%, why do we need dual thermostats?
TIA & Blessings!
Why 180 thermostats, then?
This leads me to ask why people like to put 180F thermostats in their cooling systems? Since the radiator cools more effectively with a higher delta T, doesn't this prematurely rob the cooling system of it's optimum effeiciency, which, I'll assume was designed in by GM originally for the factory stock 195F (or is it 205F?) T-stats?
I realize that there are 2 deltas at play; engine -> coolant, and coolant -> air (through radiator), but given that cylinder wall temps will be as high as 400F or more, finding a spot closer to the mid-point between 400 and ambient (say 100F) would seem to be a better fit.
Or is 195F just better for emissions only and at the expense of better cooling that could be obtained with 180F?
h**** diesel just came out with a new system...
I guess the single 180 stat,marine pump,cooler clutch with the dmax fan must be the ticket on keeping it cool. As We now when he comes out with a setup it must be great.