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| Slant Six bbd vacuum question https://slantsix.org/forum/viewtopic.php?t=49364 |
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| Author: | dude0936 [ Fri Jul 20, 2012 3:04 pm ] |
| Post subject: | Slant Six bbd vacuum question |
I am mocking up a super six with a 1974 BBD for my 1975 slant six. I am making sure that I have the vacuum lines set up correctly. When viewing the carburetor from the front where the fuel line enters the float bowl there are two vacuum ports: Canister purge between the idle mixture screws The air pump diverter valve (which I have capped) http://i748.photobucket.com/albums/xx12 ... C06699.jpg When viewing the carburetor from the side with the choke diaphragm there are two vacuum ports: The float bowl to canister The distributor http://i748.photobucket.com/albums/xx12 ... C06700.jpg When viewing the carburetor from the back side looking at the curb & fast idle adjusting screws there are are three vacuum ports: The PCV Heated Air The choke diaphragm and egr t-ed together http://i748.photobucket.com/albums/xx12 ... C06702.jpg A few more pictures: http://i748.photobucket.com/albums/xx12 ... C06703.jpg http://i748.photobucket.com/albums/xx12 ... C06704.jpg Do these vacuum ports sound correct? I also have a cast iron intake manifold and an aluminum manifold are there any benefits or disadvantages to using one over the other? Thanks, Chris |
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| Author: | SlantSixDan [ Fri Jul 20, 2012 3:10 pm ] |
| Post subject: | |
I think you've got the ports correct -- Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download, and there's a BBD book in the collection. Aluminum's nicer if it's unwarped and uncracked. If it's the yellow one in the pics, it's one of the EB-welded intakes (prominently visible weld bead all around the upper perimeter of the manifold) so it will want very careful inspection for cracks in the floor. |
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| Author: | dude0936 [ Sat Jul 21, 2012 10:44 am ] |
| Post subject: | |
Thanks Dan, I was most concerned with the choke diaphragm and the egr being fed by the same vacuum port but I have found some information that seems to support the idea that they indeed did share the same port on some applications. I have read about the problems you mentioned with the aluminum manifolds, I am going to media blast the manifold to remove the yellow paint and after washing the manifold I will check for cracks inside and outside of the manifold. http://i748.photobucket.com/albums/xx12 ... C06730.jpg Thanks for the help, Chris |
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