Starting to see the point...the differing temps in the stats may cause the fan to run against the rad when the rad isn't getting flow etc. I'm learning here! I'm not too concerned about the pressure, at the end of the day I'm not changing that behaviour.
If I'm going to try this, I will need an 82 stat. I need to find that Rover stat on its own.
Love this from the link you sent
Designed to help to prevent thermal shock suffered by the engine and reduce head gasket failure by keeping the engine temperature change at a slow and even rate.
I've been looking at how the PRT works, I've pinched someone's diagram and modified it to represent how I believe it would be connected. Now my concern here is that the shape of the PRT will result in the full force of the coolant flow hitting the back of the stat causing it to stay open just like the factory stat. It won't be able to close the bypass.
I know the housing I picked is only subtly different, but I was hopeful it would alleviate the pressure issue.
I'm starting to think this isn't going to work, it's going to need your modification, or remove the factory stat?
Whilst you are thinking about thermostats think about the standard Duratec one , its double ended , when it heats up it opens to let cold water flow from the rad whilst at the same time it closes the bypass loop .
Not trying to be obtuse here just want you to think and understand how the system on your 420 works .
Having posted what I mentioned in #19 about pressure pinning the stat closed, I'm wondering if the fact there's 32mm exits either way there won't be the force on the plate, so it can move, unlike the OEM housing with only the 16mm bypass hose.
Does the force/pressure only occur at the factory housing, and drop beyond the expansion bottle,
https://www.dmgrs.co.uk/products/prt-thermostat-rover-75-mg-zt-1-8-k-series-pem100990
This one is 82 degrees
Same 82C stat at a better price. Rimmer Brothers
Driving 'The Fat One'
Starting to see the point...the differing temps in the stats may cause the fan to run against the rad when the rad isn't getting flow etc. I'm learning here! I'm not too concerned about the pressure, at the end of the day I'm not changing that behaviour.
If I'm going to try this, I will need an 82 stat. I need to find that Rover stat on its own.
Love this from the link you sent
Designed to help to prevent thermal shock suffered by the engine and reduce head gasket failure by keeping the engine temperature change at a slow and even rate.
Should send that to CC.
i can't see where it states this is 82 degrees , the standard Rover ones are normally 87 or 88
Just been out and had a look at the temp gauge, from memory I think the fan kicks in at 90c. If you could confirm that would be amazing. thanks
Wow thanks guys, those links have lots of options.
I notice Rimmer Brothers have a couple of OEM 82 stats at different prices.
https://rimmerbros.com/Item--i-GRID018846
Anyone more recommended over another?
I've been looking at how the PRT works, I've pinched someone's diagram and modified it to represent how I believe it would be connected. Now my concern here is that the shape of the PRT will result in the full force of the coolant flow hitting the back of the stat causing it to stay open just like the factory stat. It won't be able to close the bypass.
I know the housing I picked is only subtly different, but I was hopeful it would alleviate the pressure issue.
I'm starting to think this isn't going to work, it's going to need your modification, or remove the factory stat?
Mark
Whilst you are thinking about thermostats think about the standard Duratec one , its double ended , when it heats up it opens to let cold water flow from the rad whilst at the same time it closes the bypass loop .
Not trying to be obtuse here just want you to think and understand how the system on your 420 works .
doing my best here....
Having posted what I mentioned in #19 about pressure pinning the stat closed, I'm wondering if the fact there's 32mm exits either way there won't be the force on the plate, so it can move, unlike the OEM housing with only the 16mm bypass hose.
Does the force/pressure only occur at the factory housing, and drop beyond the expansion bottle,
I'm getting confused