Normal stat vs. inline stat
Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
Also, fwiw, I didn't drill a hole in my thermostat or get the one with the wiggle part. Unlike the two pictures above, I have the inline mod you see in the forums and there is a pettcock valve on a fitting for releasing air. I fill from the hose on the radiator side of the thermostat, close it up, then open that valve and finish it off from the expansion tank with the valve open, until liquid bubbles out. The hole method doesn't leave a very large hole for air anyway and keeping it at 12 o'clock in a screw-on setup is not the easiest thing to do.
Recovery Vehicle
Joined: Sep 2015
Posts: 820
Likes: 46
From: SF Bay, California
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.
Last edited by DiscoCam; Jul 14, 2016 at 12:00 AM.
Recovery Vehicle
Joined: Sep 2015
Posts: 820
Likes: 46
From: SF Bay, California
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.
Recovery Vehicle
Joined: Sep 2015
Posts: 820
Likes: 46
From: SF Bay, California
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.
Recovery Vehicle
Joined: Sep 2015
Posts: 820
Likes: 46
From: SF Bay, California
I didn't know that the engine temperature can affect emissions that much. I hope my D2 passes smog next month.
Camel Trophy
Joined: Aug 2014
Posts: 4,743
Likes: 985
From: Southwestern Virginia
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.
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.
