Mystery device mounted to heat shield btw SU's

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RustyBucket
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Re: Mystery device mounted to heat shield btw SU's

Post by RustyBucket »

Glad I have some pictures to be able to put the plumbing back in order. I've not seen another photos or information on this smog arrangement.

- Here is a trick question for you.. Are harden valve seats required for "today's fuels" to keep form trashing the rest of the motor ? :roll:
Any experience with that ??
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Re: Mystery device mounted to heat shield btw SU's

Post by keith0alan »

I have had a few heads off an have never seen major issues with the bronze intake valve seats. I would not take an engine apart just to do the valve seats. Do them next time the head needs to come off for other things like valve guides and stuff.
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Re: Mystery device mounted to heat shield btw SU's

Post by RustyBucket »

Keith,
Thank you for the information! I was hoping that would be the case

As it is, I have the clutch mc and the brake mc to rebuild/ replaced, lines to flush, wheel cyls to deal with. $$
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Re: Mystery device mounted to heat shield btw SU's

Post by david premo »

I think that maybe a Datsun 411 intake manifold for an automatic transmission.
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Re: Mystery device mounted to heat shield btw SU's

Post by roadsterdude1600 »

My '70 project also has the mystery device. I am planning to de-smog when I put it back together, but I also wondered what it does. Just bolted to the manifold with 2 dangly wires...They had to re-machine the intake manifold to mount that gismo, and only in 1970. I have 6 other intake manifolds without that boss. A lot of trouble for something that looks like a "feel good" smog helper.
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Re: Mystery device mounted to heat shield btw SU's

Post by Linda »

I wonder if anyone who has a 70 has gone so far totally stock that they actually keep all that smog system crap....at least for the car show....
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Re: Mystery device mounted to heat shield btw SU's

Post by RustyBucket »

Mike . I have a late ‘69 and a ‘70 SPLs. My intake had the ‘gulp valve’ which ‘prevents backfired’ between gear shifts, I was told.

I sent my intake and SUS to Ztherapy for a rebuilding and every thing return in beautiful condition - except he plugged the smog ports and eradicate the gulp valve.😳

They are mounted on the engine, but I ve yet to fire the car up due to prior commitments.

Call or email Ztherapy for help maybe
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Re: Mystery device mounted to heat shield btw SU's

Post by redroadster »

That last pic shows ...what looks like a anti backfire valve
With high vacuum the engine pulled fuel through enough to cause a bf plus burn it it opened a big vacuum leak until vacuum lessend
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Re: Mystery device mounted to heat shield btw SU's

Post by roadsterdude1600 »

Image I am trying to post a picture of an old and "new" (1970) intake manifold side by side to show the new casting with the boss for the anti-backfire device. I am not sure how to post a picture. When I click insert image it does not allow me to navigate to the image. I know I have done this before, but age is catching up...something obvious I am sure.
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Re: Mystery device mounted to heat shield btw SU's

Post by RustyBucket »

GULP Valve and the treatment performed by ZTherapy on my nasty intake manifoldand SUs. *Minus the SMOG)

I had to dig around for the before and after photos. Hope these help
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IMG_0305.JPG
IMG_0471.JPG
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Re: Mystery device mounted to heat shield btw SU's

Post by spl310 »

It looks like Z Therapy changed out your manifold to an early manifold. They didn't have smog stuff.
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Re: Mystery device mounted to heat shield btw SU's

Post by RustyBucket »

I thought that was rather odd too. I figured that they would have returned the correct manifold. Now I have to strip the air pump and other smog parts off.

Will it run correctly now ??
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Re: Mystery device mounted to heat shield btw SU's

Post by spl310 »

If you strip the smog stuff off and set the car up like a pre smog car, it will run better. That being said, if you want to retain it, you could push back and tell them that you want the original 1970 manifold.
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Re: Mystery device mounted to heat shield btw SU's

Post by RustyBucket »

I think I’ll give the no smog attempt a try since the other smog parts are not in good shape to begin with 😳
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Re: Mystery device mounted to heat shield btw SU's

Post by RustyBucket »

I gave to figure which bits to remove and what ports/ hoses need to be plugged - that’s going to be pain
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