Cool thanks. I'll check there. Happy 4th!

 

I see you've drilled a hole now, but FYI for future readers, the hole is drilled more to allow water to pass through and get hot water to the thermostat and open it quicker more than it is for bleeding. Definitely helps with bleeding, but it's also a good idea just to keep away temp spikes below the thermostat opens.

 

Is it beneficial to drill more than 1 hole in the thermostat? I am doing this mod today and I just want to make sure.

 

No, if you drill too many or top big a hole then it will take your truck a lot longer to heat up. 1/4"-3/8" is about perfect.

 

Just drove my D2 today with the new thermostat. Before, my highest temp was 214*F. That was with the original thermostat. Now with the inline 180*, the highest I saw was 193*F. On the highway it was at 188*F. This is a great mod.

 

214F was with the OEM non grey thermostat I bet. I know I get 188-193F out of the OEM grey thermostat until the ambient temp finally catches up to going 75-80MPH in SETX with an Air Intake temp of 134-143F and outside air temp in the upper 90's with a heat index of 110F.

 

It was the original thermostat as it looked pretty old and I never recall it being changed. I think it was sticking closed recently as sometimes I would get spikes of 220F. That never happened before. To this day, IDK why Land Rover didn't include the TD5 stat with the V8 trucks. It would have made them much more reliable.

 

It was so they ran hotter so there would be less emissions, from what I've heard.

 

I didn't know that the engine temperature can affect emissions that much. I hope my D2 passes smog next month.

 

Yep. I don't recall what the effect is called, but here's why in essence. Inside the combustion chamber, air and gas is pulled in and fills the cylinder. Then, as everyone here knows, the spark plug sparks and ignites the air fuel mixture, but not all of the mixture ignites. The air/fuel right next to the cylinder walls doesn't become hot enough because the cylinder wall itself keeps it cool, leading to unburnt fuel and causing higher emissions. The hotter the engine runs, the smaller the unburnt gap is.

If you go on the Practical Engineering channel and look up the clear potato gun in slow motion video (I can't recall the name) it explains this very well.

As for passing smog, you shouldn't have any issue. The initial tests for vehicles are more strict than renewal tests.