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!