Intake bridging hose on R16

Tech tips and how to's

Moderators: notoptoy, garth, S Allen

User avatar
vorpal
Roadster Fanatic
Posts: 76
Joined: Fri Sep 21, 2012 2:32 pm
Location: Edmonton, Alberta, Canada

Intake bridging hose on R16

Post by vorpal » Wed May 16, 2018 5:14 pm

Hey all... going through the 67.5 1600 I picked up at auction... engine bay is a mess, slowly starting on fixing it.

Re-routed the fuel lines correctly and pulled off the plastic split loom someone had wrapped them with :-?
Replacing the old cracked throttle cable that continually sticks, despite the homebrew 'return springs'. Ross from Sports Imports is express shipping another one (so good to live in Canadia :lol: )

However, looking at the intake manifold, someone has bridged a hose between the two runners:

Image

Car seems to start, idle and run fine despite this. Should I pull and plug the intake runners or just leave the weird hose there... looks fugly.

Thanks,
Rob
1969 Datsun 2000 Solex # 12921
1967.5 Datsun 1600 # 14262
1990 300ZX Twin Turbo
another 1990 300ZX Turbo
1993 300ZX Convertible
new garage under construction :D
Edmonton, Canada

greydog
Roadster Fanatic-Site Supporter
Posts: 1272
Joined: Sat Nov 21, 2009 11:37 pm
Location: Vancouver, Washington

Re: Intake bridging hose on R16

Post by greydog » Wed May 16, 2018 6:18 pm

Both my high windshield cars have plugs in the intake where your bridge hose connects.
I'd remove the hose and plug the holes. You're right, it's ugly.
Dan
.68 SRL311 aka "Skortch". On the road again.
'69 SPL311 aka "Scooter" terrorizing the streets
1990 Nissan 300ZX
2008 VW GTI
2017 VW Passat

User avatar
Linda
Roadster Fanatic-Site Supporter
Posts: 6324
Joined: Sat Nov 05, 2005 11:37 pm
Location: Los Angeles

Re: Intake bridging hose on R16

Post by Linda » Wed May 16, 2018 7:11 pm

The zip ties do not add much either :wink:
Plugs are easy
Linda
68 1600
Los Angeles, CA
http://ljordan704.shutterfly.com/" onclick="window.open(this.href);return false;
It's all in the archives ---via Search--

JT68
Talented Enthusiast
Posts: 1426
Joined: Sun Jan 27, 2013 9:43 am
Location: Cumming, GA

Re: Intake bridging hose on R16

Post by JT68 » Wed May 16, 2018 8:17 pm

totally useless. The large casting between the runners is hollow. The manifold is already bridged.
JT
Datsunrestorationproducts.com

User avatar
Nissanman
Roadster Fanatic-Site Supporter
Posts: 2845
Joined: Mon Apr 16, 2007 8:07 pm
Location: Adelaide, South Australia

Re: Intake bridging hose on R16

Post by Nissanman » Wed May 16, 2018 8:19 pm

There is already a balance tube cast into the intake manifold so that hose is not only ugly but superfluous.
A pair of 1/8 BSP plugs and job done :)
Nissanman, just trying to help.
1965 SP310 Engine No. G-93326 Car No. SP310-10817
http://nissanman.shutterfly.com/117
McQueen!
He's on the road again!

User avatar
mraitch
Site Supporter
Posts: 2889
Joined: Mon Oct 02, 2006 7:03 pm
Location: Lake Balboa (SFV) - CA

Re: Intake bridging hose on R16

Post by mraitch » Wed May 16, 2018 9:56 pm

supposedly those holes are for balancing air flow - since they exist on pre-smog cars - never found anyone who uses them effectively - KeithoLan??
Peter Harrison
1970 1600 (Stroker) - TOAD SAN (Eliza)
Lake Balboa (SFV) , California

User avatar
Nissanman
Roadster Fanatic-Site Supporter
Posts: 2845
Joined: Mon Apr 16, 2007 8:07 pm
Location: Adelaide, South Australia

Re: Intake bridging hose on R16

Post by Nissanman » Wed May 16, 2018 10:11 pm

You can use them to connect a vacuum gauge to each of the runners for tuning purposes. I tried it and it does work. You can adjust the two carbs to the same reading quite easily. Ultimately, a digital EGO gauge is the beez neez ;)
Nissanman, just trying to help.
1965 SP310 Engine No. G-93326 Car No. SP310-10817
http://nissanman.shutterfly.com/117
McQueen!
He's on the road again!

User avatar
bobd
Roadster Nut-Site Supporter
Posts: 313
Joined: Mon Sep 01, 2008 12:46 pm
Location: Lakeland, FL

Re: Intake bridging hose on R16

Post by bobd » Thu May 17, 2018 6:55 am

How would you get a good vacuum reading from those holes when the bridge in the manifold connects them?

User avatar
Nissanman
Roadster Fanatic-Site Supporter
Posts: 2845
Joined: Mon Apr 16, 2007 8:07 pm
Location: Adelaide, South Australia

Re: Intake bridging hose on R16

Post by Nissanman » Thu May 17, 2018 6:57 am

It happens!
Nissanman, just trying to help.
1965 SP310 Engine No. G-93326 Car No. SP310-10817
http://nissanman.shutterfly.com/117
McQueen!
He's on the road again!

User avatar
keith0alan
Roadsteraholic
Posts: 722
Joined: Wed Sep 22, 2004 10:07 am

Re: Intake bridging hose on R16

Post by keith0alan » Sat May 19, 2018 5:44 am

Loose the hose. The balance tube in the manifold is more than adequate. In the early cars that is actually a casting hole plugged with a screw in plug. On the later ones they used it for emission stuff. The hose is: in the way, looks ugly, a problem when it fails, not needed.