Jump to content
HybridZ
rand

What's this on my exhaust manifold? (1971 240Z)

Recommended Posts

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?

 

exhaust.thumb.jpg.9cfe1c31a53973b2f3f68a9ac1115024.jpgexhaust3.thumb.jpg.8c152baab45b8aca906e22a527ac8e02.jpgexhaust2.thumb.jpg.93594f6b1872ad7536b8b86aa6e75eea.jpg

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

See picture from Factory Service Manual (FSM)

 

1929687967_HEATRISERCONNECTION.thumb.jpg.4f902b7b4a06f95bd4c8079d0aef1e6c.jpg

 

 

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 by Miles

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites
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 by Miles

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×