rand Posted January 27, 2019 Share Posted January 27, 2019 I'm currently pulling the manifolds off of my 1971 240Z, and I can't figure out what this pipe is that's bolted onto my exhaust manifold. It looks totally vestigial because there is no opening for it on the manifold side, and the other side just dangles into the engine bay. What is this thing, and can I leave it off when I put everything back together? Quote Link to comment Share on other sites More sharing options...
Enzo250gto Posted January 27, 2019 Share Posted January 27, 2019 Hi, That's the hot air intake and attached from the exhaust manifold to the bottom of the air cleaner. It redirects hot air the prevent the carbs icing up in winter (cold climates). The correct air cleaner will have a sensor and valve device which will mix the air drawn into the carbs at a set temperature to stop icing up. Also keeps the emissions reduced and stops condensation build-up in the valve cover. Cheers David. Quote Link to comment Share on other sites More sharing options...
Miles Posted January 27, 2019 Share Posted January 27, 2019 (edited) See picture from Factory Service Manual (FSM) Useful information Download a Factory Service Manual (FSM). http://forums.hybridz.org/topic/48825-factory-manuals-some/?page=2&tab=comments#comment-1208329 Download electrical schematics for your car. PDFs are easier to read than those found in books. Some are in color. Buy the book How to Restore Your Datsun Z Car by Wick Humble. It will save you hours of searching for "how to" info. Focus on searching Hybridz as 99% of questions have already been addressed. Start bookmarking Z car parts suppliers - there are many! For SU carbs, parts and instructions go to Ztherapy. Buy the "Just SUs" video. Remember these are 40 year old cars and will need restoration to be safe and drivable. Join ClassicZCars.com website and search there as well. Become well informed about modifications before asking questions. People will be more inclined to answer informed questions. Search the forums. Read all of the new member guidelines and FAQs Links: https://www.datsun-240z-upgrades.net/ Recommend the headlight relay harness http://zhome.com/ https://www.zcar.com/ http://www.classiczc...com/index.html/ http://www.zcarparts.com/ http://www.arizonazcar.com/ http://www.jagsthatrun.com/index.html http://www.ztherapy.com/ http://www.xenonzcar.com/reference.html Edited January 27, 2019 by Miles Quote Link to comment Share on other sites More sharing options...
rand Posted January 28, 2019 Author Share Posted January 28, 2019 Aha, that makes perfect sense. Thanks David and Miles! A friend printed out a FSM (the one here) for me as a gift and that hot air intake diagram isn't in it. Miles - which FSM did you pull that image from? It looks like my flexible tube deteriorated long ago. I'll reinstall the intake and hunt around for a replacement tube at some point. Quote Link to comment Share on other sites More sharing options...
Miles Posted January 28, 2019 Share Posted January 28, 2019 (edited) 32 minutes ago, rand said: Aha, that makes perfect sense. Thanks David and Miles! A friend printed out a FSM (the one here) for me as a gift and that hot air intake diagram isn't in it. Miles - which FSM did you pull that image from? It looks like my flexible tube deteriorated long ago. I'll reinstall the intake and hunt around for a replacement tube at some point. Look here: http://www.xenonzcar.com/s30/reference.html EG Engine General.pdf Edited January 28, 2019 by Miles Quote Link to comment Share on other sites More sharing options...
Miles Posted January 28, 2019 Share Posted January 28, 2019 Just go to a parts store and ask for heat riser flex tube of the correct diameter. Summit Racing probably sells the flex tube as well. Quote Link to comment Share on other sites More sharing options...
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