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Intake water bypass question


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Maybe I misunderstand what you meant  but On my 240 the hoses pass through the firewall and attach to the heater core under the dash one attaches to a valve that can limit the amount of warm water to the core  

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I shouldn't have been pretty sure.  I wouldn't think running the hose straight through the firewall was a good idea.  At least I qualified my thought.  Good that they figured out a better way by the 260Z.  

Nonetheless.  If those are original hoses they're ready to blow.  So, at least, something to consider if the hoses are ever changed.

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But the hose clamps are still inside the cabin if I remember correctly. I had the dash out once and I replaced the very small hose that I think goes to the valve, but didn’t replace others. I’m still learning about this car, I’ll probably have to take the dash out for something els again sometime. 
Is the hose clamp for that heater hose in question accessible with the dash in? I imagine some things would have to come out first at least 

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You’re most welcome and to answer the question posted by [mention=23570]Siteunseen[/mention] that I forgot to answer, yes it just caps off the “spider/bug” hole created by the first cap that is inside the Y pipe already.

 

Now that’s an interesting coolant setup! I had never seen it go in at the balance pipe end before. Normally it feeds the manifold from below.

 

See my markup in yellow on your photo (and strictly no phallic jokes, that’s the other illicit thread)

 

c0ad00161780a8e10e04db514741344f.plist

 

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3 hours ago, AK260 said:

Now that’s an interesting coolant setup! I had never seen it go in at the balance pipe end before. Normally it feeds the manifold from below.

Just looking close at your photo, holy original exhaust manifold Batman! Is that some kind of emissions reducing air injection setup?

All that stuff is stock 73 / 74 flat top gala. 73 was the first year for EGR and they ran coolant through the balance tube to cool the EGR gasses. And as for the other thing you highlighted... Yes, it's an air injection system to pump air directly into the exhaust stream to continue combustion. Not positive what year they started that, but it was present by 72.

I'm guessing everything you've ever looked at closely already had headers and round tops?

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9 hours ago, heyitsrama said:

I think you can access them if you lay down in the passenger floorpan. Bring a flashlight, and lookout for the spider-bros.

I have actually accomplished that. It is not fun. Old stiff hoses near impossible to remove and don’t try to reuse them. Get new hoses first. 

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All that stuff is stock 73 / 74 flat top gala. 73 was the first year for EGR and they ran coolant through the balance tube to cool the EGR gasses. And as for the other thing you highlighted... Yes, it's an air injection system to pump air directly into the exhaust stream to continue combustion. Not positive what year they started that, but it was present by 72.

I'm guessing everything you've ever looked at closely already had headers and round tops?

 

Thanks for the education CO!

 

You’re very right sir - I’ve rarely seen the stock manifold on a US 260z or flat tops close up. My 260 came with the round tops and an MSA header. The sound had me at hello!! I was so excited that I even drove off without a receipt or the V5 (our version of title documents)!

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Your's is a lot different than my '72. Here's what I see that I would plug.

Blue circle. There should be one on the front intake as well closer to the radiator.

image.png

This is the Y pipe I believe for your car. It should connect to that hard line you circled behind the head above.

image.png

Then the thermostat housing. I can't find a picture of mine right off but I did find this.

image.png

 

image.png

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20 minutes ago, Cooper260z said:

Since the water line into the balance tube is egr related and just about none of the other egr stuff is going to be working, I should be fine to block off that water I presume?

It's hot air off the exhaust, not water in the EGR. If you followed that down you'd see where it connects to the exhaust.

My orange line here...

image.png

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Awesome! Thanks for the help! I’ll get some of those pipe plugs pretty soon and get on that!

 

And I will change the old heater hoses soon too. The car is not being driven yet so I have some time before those are a necessity, but they’re next on the list for sure. 

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I added some additional detail to [mention=32052]AK260[/mention]'s drawing to clarify what each of those hardlines do.
waterandegr.thumb.jpg.6b34f6495a00f2d55bf9b5700d75196c.jpg


ROFLMAO - CO, I had a feeling you’d bring it! Thank you for the detained clarifications.
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6 hours ago, Captain Obvious said:

It's a bundle of snakes under the stock 73/74 hoods.

And I’m trying to desnake it a bit!

 

I was about to go to the hardware store to get the plugs that were previously mentioned but then my dad said “or we could just weld it.” And that sounded cheaper and fun so I did that. And if I somehow messed it up, I have two others. 
seems solid, now I’m working on the other things that come off and need to be plugged 

7EB178CF-F591-4C1A-9E6E-5F86C937903D.jpeg

5294FCDB-BAAA-4319-BE3D-5644131CF4BD.jpeg

33AF5FB0-A707-4C5F-9BC8-BA59DC5699D5.jpeg

959D5DB8-EAE4-4291-81DE-CF0EB9286811.jpeg

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  • 2 months later...

@Trnelson I don’t have any pictures or specs to help you out too much, but I found a threaded plug that was already at my house that fit. But there is still an open port on one of the manifolds because I ran out of plugs, but I’m pretty sure that the water passage is separate from the air passage so leaving the ports open doesn’t effect how the car runs

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