Quote:
Originally Posted by HighlandPete
The main thermostat is calibrated to open at 88-degrees +/- 5-degrees according to data. This means we should ideally be around 88 - 91 degrees once hot, and no real reason to cool down, once peaked past the opening temperature.
But... it seems we have a lot of engines that quite quickly lose that optimum setting, and settle in the mid 80's. The lads who run the Rover/BMW M47R engine don't have the EGR thermostat, but use the same basic thermostat in a different housing. Their experience is, even with new main thermostats, many will within a few months start tailing off from the 88-90 degree range and settle in the mid 80's. One of their Indy mechanics has changed dozens of them, none are open, but have lost the optimum range. There appears no real explanation, as a wax type thermostat element doesn't normally fail in this mode.
HighlandPete
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As ever Pete, great background and detail! Out of interst what is the Rover variant...is it a petrol?
Quote:
Originally Posted by HighlandPete
Many of the Rover M47R users are fitting an additional thermostat in the top hose to prevent low running temperatures, poor cabin heating and low mpg.
HighlandPete
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so this is the key....how many people are seeing those symptoms if ther 330d are running at mid-80s?
I'm am getting great mpg on a run (high 40s-low 50s) and cablin heating seems quick
But of course could I be getting even better mpg
