Originally Posted by ZeeOSix
That means the oil temp in journal bearings and in other hot spots like the ring pack is even higher than the 290 F sump temperature.
True, where the temperature sensor resides matters. There was a BMW chief engineer quoted on bitog a while back (can't find it now!) that I think said the cylinder walls heat the oil there to about 400 deg F, and Mobil has always claimed 400 F inside turbo's. So there is likely your peak. Those might be worst case numbers already, so I wouldn't think we need to add much to them for hot racing.
Question for Corvette techies: Does it have an over-temperature partial shutdown mode? The BMW engineer I cited above said something about how theirs have that to keep a person from being concerned about the temperature gauge. Off topic, but the Tesla will cut it's amps if temperature gets high. Makes sense in expensive machines like Vettes, Hellcats, any that cost $$$.
Possibly similar to what GM did with the Northstar V8: "Supplying fuel to only one cylinder bank in turn, the engine would "air cool" the inactive bank. This technique, combined with its all-aluminum construction and large oil capacity, allows the engine to maintain safe temperatures, allowing a Northstar-equipped car to be driven with no coolant for about 100 mi (161 km) without damage." -- wikipedia
That means the oil temp in journal bearings and in other hot spots like the ring pack is even higher than the 290 F sump temperature.
True, where the temperature sensor resides matters. There was a BMW chief engineer quoted on bitog a while back (can't find it now!) that I think said the cylinder walls heat the oil there to about 400 deg F, and Mobil has always claimed 400 F inside turbo's. So there is likely your peak. Those might be worst case numbers already, so I wouldn't think we need to add much to them for hot racing.
Question for Corvette techies: Does it have an over-temperature partial shutdown mode? The BMW engineer I cited above said something about how theirs have that to keep a person from being concerned about the temperature gauge. Off topic, but the Tesla will cut it's amps if temperature gets high. Makes sense in expensive machines like Vettes, Hellcats, any that cost $$$.
Possibly similar to what GM did with the Northstar V8: "Supplying fuel to only one cylinder bank in turn, the engine would "air cool" the inactive bank. This technique, combined with its all-aluminum construction and large oil capacity, allows the engine to maintain safe temperatures, allowing a Northstar-equipped car to be driven with no coolant for about 100 mi (161 km) without damage." -- wikipedia