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Thanks.
She is back on the road which is good but I'm not sure about the thermostat. It's a circoli one and does cross reference correctly along with a fiat and a couple of other vehicles but somehow I'm not happy. It wasn't as tight a fit as the original but sufficiently close to seat without a gap and to seal. I oriented it correctly with the bypass hole to the top. It was new in box. It's just that now she's taking longer than expected to warm up and isn't really running warm enough in general driving but then is warning up and cooling down quite quickly? To quantify the above statement. Previously from cold she was at 85 ish within a mile and a halfand would idle at that for a few minutes while collecting my passenger, now on the same journey she's at 75 and climbs to 83 while waiting. Then on the return journey she wouldn't get to more than 91 if I had to sit in traffic. Now she varies between 70 and 93 depending on traffic but as soon as I start to move the 90+ drops very quickly? I would have expected to see the temperature climb a little quicker and maintain around thermostat opening within a couple of degrees not be varying 10 degrees either way?
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!
Another thought. It's not inconceivable that the better designed impeller blades on the new pump could have a noticeable effect on speed at which the temperature drops? But that shouldn't have a bearing on the actual operating temperature just how well it's controlled?
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!
The temperature in normal use will have a "window" of operation. This window has a number of variables........
Static air temp
Barometric pressure
Humidity
Cooling air flow from the fan
Cooling air flow from forward movement
Fuel quality
Coolant quality
Coolant flow
Coolant pressure
Air/fuel ratio
Ignition timing
Under bonnet temperature
Engine oil quality
Engine load (rpm / torque load)
So many variables that it is very difficult to actually find a "normal" point of use.
Combustion is a very fickle process and can deliver vastly different temperatures with tiny changes in parameter.
The new pump / thermostat / flush / coolant change should be enough to move that window down the temperature range and change the system enough for you to notice a difference in how the car feels, in use.
On a performance engine, those changes would be enough to need a session on the rollers. The "tune" would need fine adjustment to deal with the changes in block temperature. A cooler engine generally means more power can be had.
I appreciate all that and if it were a matter of 2 or 4 degrees I would be fine with it. However a running temperature drop of between 10 and 12 degrees is significant and not just a tolerance issue. Something is out of whack, the thermostat being a prime candidate
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!
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