himself Posted June 27, 2007 Share Posted June 27, 2007 On a stock '82 zxt motor there is a metal line running from the passenger side of the engine, around the front of the motor, under the fuel rails where it becomes rubber and goes into the air regulator, comes back out the other side and goes into the back of the throttle body. From there it returns to the thermal housing and goes back into the coolant stream. Can I cap off the ends of this tube at the thermal housing and the passenger side where it comes through? All it does is pass through the tb real quick and return to the coolant flow. (It is not actually regulated by the air regulator, datsun just used that as a mounting place.) Quote Link to comment Share on other sites More sharing options...
MrFancypants Posted June 27, 2007 Share Posted June 27, 2007 Thats the throttle body warmer. In a warm climate like California you shouldnt need it. A lot of people use that coolant circuit for their turbos. - Greg - Quote Link to comment Share on other sites More sharing options...
naviathan Posted June 27, 2007 Share Posted June 27, 2007 Thats the throttle body warmer. In a warm climate like California you shouldnt need it. A lot of people use that coolant circuit for their turbos. - Greg - It's also used to keep the air regulator on top of that plate from opening up after you shut the key off. Without it the air regulator will open the plate back up when the engine isn't cooled down creating a vacuum leak until the bi-metal strip heats up again and closes it. It's part of the warm up circuit and you probably don't want to remove it. Quote Link to comment Share on other sites More sharing options...
himself Posted June 27, 2007 Author Share Posted June 27, 2007 I pulled the air regulator so I'm just going to cap off that coolant line for now. Thx. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted June 27, 2007 Share Posted June 27, 2007 It also serves another purpose besides heating the TB and AAR. IIRC, it also allows a small amount of coolant flow around the head which can help with steam bubbles in the coolant. You can talk to Tony D. about it, but he has witnessed problems with engines that eliminate this path altogether. Perhaps drilling the small hole in the thermostat would acomplish the same thing. Something to watch out for. Quote Link to comment Share on other sites More sharing options...
naviathan Posted June 27, 2007 Share Posted June 27, 2007 Newer thermostats have a small hole in the middle of the valve to allow a small amount of coolant flow when the thermostat isn't open. Although looking at it again I don't think it's big enough to make a considerable difference. I found this online and according to the page they drilled the holes to allow air to escape from the block when filling it with coolant. Quote Link to comment Share on other sites More sharing options...
MrFancypants Posted June 27, 2007 Share Posted June 27, 2007 I pulled the air regulator so I'm just going to cap off that coolant line for now. Thx. You can also just bypass the TB altogether by disconnecting the hoses and joining them together directly. This would keep the circuit flowing if it is used for more than just a TB warmer. Not sure if youre trying to decrease intake temps or clean up coolant lines in your engine bay. Didnt know about the air regulator! - Greg - Quote Link to comment Share on other sites More sharing options...
himself Posted June 27, 2007 Author Share Posted June 27, 2007 I didn;t know about that air bubbles part. Then I'll uncap the lines and just link them from the passenger side out back through the tb and bypass here it used to go into the air regulator since it's no longer there. Thx for that piece of info moby. Quote Link to comment Share on other sites More sharing options...
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