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The 140 kPa cap (20 PSI) allows the boiling point of a 50:50 coolant/water mixture to go to 239 F before steam is released into the engine bay. The 140 kPa was the standard cap on most other Jaguar models of the recent past.
The regular operating temperature of the F-Type can range from 180 – 230 F during normal driving (not racing).
The 200 kPa cap (29 PSI) allows the boiling point of a 50:50 coolant/water mixture to go to 260 F before steam is released in the engine bay.
Could the overheating leading to the warped heads and complete engine loss be a result of the extra pressure of the 200 kPa cap allowing the temperature to rise to 260 F before the driver is aware?
The temperature bar gauge has time and time again failed to give adequate early warning on overheating. Do we know what specific temperature will set off the alert? By the time an alert is raised and the driver can safely pull over to shut the engine down, the damage has been done.
This is why I never drive without Torque Pro running real time coolant temperature onscreen and an obnoxious audible alarm set at 230 F that overrides music or telephone calls in progress.
I do use the 140 kPa cap.
I switched to a 140 kPa cap a few years ago and zero problems so far.
I did so purely as preventative maintenance seeing as my F-Type still has the original crappy seamed coolant pipes.
I keep the OEM 200 kPa cap in the boot/trunk as an emergency back up.
When I asked my Jaguar dealer to provide a new OEM radiator cap for the F-Type, the one they supplied was the 140 kPa, not the original 200 kPa unit. And like OzXfR, I have had zero issues with the lower pressure cap in place.
When I asked my Jaguar dealer to provide a new OEM radiator cap for the F-Type, the one they supplied was the 140 kPa, not the original 200 kPa unit. And like OzXfR, I have had zero issues with the lower pressure cap in place.
Hmmm. That I do find interesting. Did they offer an explanation for why they did that? Just curious.
The 140 kPa cap (20 PSI) allows the boiling point of a 50:50 coolant/water mixture to go to 239 F before steam is released into the engine bay. The 140 kPa was the standard cap on most other Jaguar models of the recent past.
The regular operating temperature of the F-Type can range from 180 – 230 F during normal driving (not racing).
The 200 kPa cap (29 PSI) allows the boiling point of a 50:50 coolant/water mixture to go to 260 F before steam is released in the engine bay.
Could the overheating leading to the warped heads and complete engine loss be a result of the extra pressure of the 200 kPa cap allowing the temperature to rise to 260 F before the driver is aware?
The temperature bar gauge has time and time again failed to give adequate early warning on overheating. Do we know what specific temperature will set off the alert? By the time an alert is raised and the driver can safely pull over to shut the engine down, the damage has been done.
This is why I never drive without Torque Pro running real time coolant temperature onscreen and an obnoxious audible alarm set at 230 F that overrides music or telephone calls in progress.
I do use the 140 kPa cap.
I have no experience with this Torque Pro. Are there any battery draining disconnect issues going on for you with that setup that you have?
Hmmm. That I do find interesting. Did they offer an explanation for why they did that? Just curious.
No, no explanation given. The 140 kPa cap was one of the items my dealer provided for fitting of the metal coolant pipes, change of supercharger oil etc. Everything properly installed, no issues of any kind (but this dealer, Jaguar Land Rover Victoria has always provided excellent service for my Jags over decades).
200 vs 140 kPa coolant caps and overheating considerations
