The T Bob works to circulate coolant in the engine cylinder to maintain an evenly heated cylinder, then when the temp rises enough to open the thermostat, coolant flows to the radiator to remove the heat from the coolant. This action mimics car engine cooling systems, at least the older systems I'm familiar with.
I too notice that even with a T Bob, the radiator starts warming almost right away. I contribute this partly to the fact that there is a tiny bypass in the thermostat itself which allows some flow even when the stat is "closed".
2016 KLR 650
2017 BMW S1000RR (traded in for
2018 Ducati V4S
1983 GL1100 Goldwing
2017 Yamaha R1
Last edited by dan filipi; 08-16-2018 at 08:12 PM.