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UkeGhia
Samba Member
Joined: February 25, 2019
Posts: 12
Location: San Francisco
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 Posted: Thu Feb 06, 2020 12:04 am Post subject: Modification to Intake Manifold Heat Riser-Parts Identification |
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I have been restoring my 68 Ghia and came across a modification to the heat riser tube for the intake manifold. In the image you can see how a part has been welded to the heat riser. I have circled two parts in the image, does anyone know what these parts are for? Wondering if I should keep this modification or pull it out and install new heat risers. This is a single port, single relief engine.
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c21darrel
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Joined: January 22, 2009
Posts: 8211
Location: San Dimas
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61SNRF
Samba Member
Joined: March 29, 2009
Posts: 4657
Location: Whittier 90602
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| Posted: Thu Feb 06, 2020 3:40 pm Post subject: Re: Modification to Intake Manifold Heat Riser-Parts Identification |
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Hi,
It's a retrofit EGR system sold by Grancor in the 70's...
Image found on search in hazetguy's Gallery.
Background: in the early 70's, to reduce NOX emissions, the State of California required VW owners to have this devise installed by a licensed installer/station in order to renew the registration or transfer the title.
Although not as effective, most other older liquid cooled cars also got some form of devise or engine mods to reduce NOX.
The system worked to a degree but killed the engine's power. Most have been long ago removed and trashed.
Since your car is now exempt from Smog Check inspection you are free to do as you wish with it.
_________________
-Bruce
An ounce of prevention is worth a pound of cure. |
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32584
Location: Reading Pennsylvania
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UkeGhia
Samba Member
Joined: February 25, 2019
Posts: 12
Location: San Francisco
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| Posted: Thu Feb 06, 2020 8:06 pm Post subject: Re: Modification to Intake Manifold Heat Riser-Parts Identification |
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Thanks Darrel and Bruce for this information on the throttle Positioner and EGR, this is really great info.
Now that I know what it’s called I was able to find it in Bentley too!
I’ve noticed that mine is missing the pull rod (see pic) so it is clearly not doing it’s job right now, I’ll have to see if I can find one or rig something up and I’m also thinking that I will pull out the EGR.
Thanks for the help!
-Jeff |
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c21darrel
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Joined: January 22, 2009
Posts: 8211
Location: San Dimas
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UkeGhia
Samba Member
Joined: February 25, 2019
Posts: 12
Location: San Francisco
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| Posted: Fri Feb 07, 2020 12:05 pm Post subject: Re: Modification to Intake Manifold Heat Riser-Parts Identification |
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| Yeah, looks like it was cut but I think it is threaded so hoping that I can find a threaded rod that I can use. |
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61SNRF
Samba Member
Joined: March 29, 2009
Posts: 4657
Location: Whittier 90602
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| Posted: Fri Feb 07, 2020 3:31 pm Post subject: Re: Modification to Intake Manifold Heat Riser-Parts Identification |
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Because the rod is threaded right hand thread on one side and left hand thread on the other you will need to find the exact replacement. You will also need a suitable left hand thread lock nut and of course the ball socket as well.
You might try searching the Classifieds or place a WTB ad.
Another option is go to your local self service salvage yard and look around in the foreign section.
By looks it appears very similar to the throttle rod from most 80's to 90's Volvo 4-cylinders with fuel injection. Very common in these cars, anything from a 240, 740 or 940 is the same and should give you everything you need except the vacuum pot itself.
_________________
-Bruce
An ounce of prevention is worth a pound of cure. |
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UkeGhia
Samba Member
Joined: February 25, 2019
Posts: 12
Location: San Francisco
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| Posted: Fri Feb 07, 2020 4:13 pm Post subject: Re: Modification to Intake Manifold Heat Riser-Parts Identification |
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Thanks Bruce for the info on the left hand threading...learning new things all of the time 
-Jeff |
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Bleyseng
Samba Member
Joined: July 03, 2005
Posts: 4752
Location: Seattle
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| Posted: Sun Feb 09, 2020 12:01 pm Post subject: Re: Modification to Intake Manifold Heat Riser-Parts Identification |
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They are actually nice to have working instead of backfiring when decelerating.
Who wants to hear that Pop Pop..
_________________
70 Ghia Black convert-9/69 build date-stock w/133k 1600 SP-barn find now with a rebuilt tranny and engine
77 Westy 2.0L w/Ljet, Camper Special engine-95hp and with LSD!(sold)
76 Porsche 914 2.1L L20c, 120hp Djet (sold)
87 Syncro Westy Titan Red 2.1L 2 knob 100k miles |
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