So what do you think, would I be better running a water to oil cooler rather that an ail to oil cooler?
thinking the laminova?
That or the Mocal set up. Not really sure on the best way to go. When SeanB had his K series I think he had an air to oil then changed to Water to oil.
with water to oil you just then require the water to do all the cooling, with air to oil you have seperate cooling circuits weight v complexity etc… the usual story
The only thing about that is that with oil to water the heat all goes into a cooling system which could be marginal anyway on a hot day.
Kart 14 here, thanks for the replies Kart 1 and Kart 6! 
I run a QED 72 degree stat and a triple pass rad.
I might be having an oil cooler built to sit under the rad but I’m worried about over cooling, could put a stat in the oil line but I don’t have a gauge so if the stat packed up I wouldn’t know.
The plus side of the oil water cooler would be that the pipes would not be required in the sill and the oil pump wouldn’t have to work so hard. Also the faster warming of the oil.
It’s a tricky one!
im going to go with a water/oil one, seems simple and it’s cold enough in the UK with my uprated rad anyway.
What temperature do you think is the lowest the oil can be run at safely in the K series?
Air to oil all the way.
The extra oil in the circuit helps and you are not putting the engine coolant circuit under so much stress.
I chose to keep the air-oil cooler on mine. I’ve added an oilstat to the circuit though. I do however have a small oil/water cooler to cool the gearbox oil since the heat loading from this is pretty low, even when under full stress.
I’m worried about over cooling and getting enough temperture in the oil quick enough. 
Only advantage with an oil-water cooler is that your engine comes up in temp quicker. This because the water is actually heating up the oil in the beginning as the water will reach its operating temperature first.
Hence the oilstat. The cooler is bypassed until the oil hits 80 degrees 
I even designed a bracket to mount it discreetly and tidily out of sight, picking up on the original fuel tank mounts.
I fitted an Eliseparts oil cooler on top of the right hand wheel arch in the air flow from the right engine duct with a thermostat take off from the oil filter housing.
I did think about a thermostat but without a gauge I wouldn’t know if I had a problem with the thermostat. I wish Lotus had put oil temps on the stack dash. 
I put a combined digital oil temp and pressure gauge instead of the cigarette lighter on top of the centre console thing-on a hot track day I wish I hadn’t-temp is unbelievable!!
I datalog my oil temps in my car. Display them on a central display that sits in the radio slot. I poll three oil temperatures in my car:
- Sump temperature, pre-cooler, generally the hottest the oil gets.
- Filter-housing temperature, after the cooler, tells me the temperature of the oil being pumped back into the engine
- Gearbox oil temperature.
These are all logged and can be analysed afterwards.
If any of these temperatures get too hot or too cold, they will bring up a unique warning on the shift-light display I have sitting right in front of me on the dashboard.
How cool is that!?!?!?!?!!?
The only thing I’m worried about is over cooling. What temperture do you think over cooling starts at???