Harlemox
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- Joined
- Jul 31, 2021
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- 3
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- Location
- California
- Vehicles
- 2021 F-150 PB Platinum
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- #1
I'm new to the world of Ford Hybrid powertrains; that being said, I'm dangerous with the knowledge I can gain via Google.
One thing I've been wondering about with the hybrid electric powertrain on the F-150 3.5 Powerboost is how Ford engineers are attempting to minimize wear from the constant start up/shut off of the engine.
As far as I can tell, the 3.5 Powerboost is a 3.5 Gen II Ecoboost strapped to a modified 10R80, i.e. the 10R80-MHT. The MHT transmission of course notably has an electric motor and disconnect clutch, but retains the torque converter, allowing the electric motor to spin the input of the torque converter.
I question how the internal bearings/etc. of the engine are protected against the constant start/stop of the engine. Conventional knowledge of modern engine architecture says that they are using oil films that are developed through engine oil pressure, and thus the crank/rods and such do not make metal to metal contact. Now, when an engine starts, there is a time where the oil film is very thin and the engine has to build oil pressure in order to help ensure the oil film is adequate for the power it is making.
Watching the "dummy" oil pressure gauge on my dash, I can see that the oil pressure builds at a rate I would expect it to for a conventional started engine when the truck switches over to hybrid mode i.e. using the engine. Does anyone know if Ford has any tricks up their sleeves to help minimize low oil pressure wear when the engines start after running in EV mode for a while? I've seen my engine go from off to 1800 RPM under very light throttle conditions, which is slightly concerning if there is no engine oil pressure before the engine hits that speed.
I know these engines have been in auto-start stop vehicles but traditionally when they start they don't get immediately spun to 1800 RPM for example, but rather, start to idle then increase their RPM from idle.
I know in the Prius world they allege that the engines do not shoot fuel/ignition until the engine has adequate oil pressure.
One thing I've been wondering about with the hybrid electric powertrain on the F-150 3.5 Powerboost is how Ford engineers are attempting to minimize wear from the constant start up/shut off of the engine.
As far as I can tell, the 3.5 Powerboost is a 3.5 Gen II Ecoboost strapped to a modified 10R80, i.e. the 10R80-MHT. The MHT transmission of course notably has an electric motor and disconnect clutch, but retains the torque converter, allowing the electric motor to spin the input of the torque converter.
I question how the internal bearings/etc. of the engine are protected against the constant start/stop of the engine. Conventional knowledge of modern engine architecture says that they are using oil films that are developed through engine oil pressure, and thus the crank/rods and such do not make metal to metal contact. Now, when an engine starts, there is a time where the oil film is very thin and the engine has to build oil pressure in order to help ensure the oil film is adequate for the power it is making.
Watching the "dummy" oil pressure gauge on my dash, I can see that the oil pressure builds at a rate I would expect it to for a conventional started engine when the truck switches over to hybrid mode i.e. using the engine. Does anyone know if Ford has any tricks up their sleeves to help minimize low oil pressure wear when the engines start after running in EV mode for a while? I've seen my engine go from off to 1800 RPM under very light throttle conditions, which is slightly concerning if there is no engine oil pressure before the engine hits that speed.
I know these engines have been in auto-start stop vehicles but traditionally when they start they don't get immediately spun to 1800 RPM for example, but rather, start to idle then increase their RPM from idle.
I know in the Prius world they allege that the engines do not shoot fuel/ignition until the engine has adequate oil pressure.
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