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| Best port to read vacum https://www.slantsix.org/forum/viewtopic.php?t=7868 |
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| Author: | DART68 [ Wed Dec 17, 2003 11:07 pm ] |
| Post subject: | Best port to read vacum |
When setting timing and curb idle, which port on a non emissions Holley 1920 is the best port to read for vacum? While I'm at, how about on a Carter BBD as well? Thanks |
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| Author: | Pierre [ Wed Dec 17, 2003 11:36 pm ] |
| Post subject: | |
You want to read manifold (not ported) vaccum. I haven't ran a carb in a long time so I couldnt describe a specific port to you, but I can say that the line leading to the PCV is manifold vaccum so that would be a surefire ticket. If you have a power brake booster, the line going to that will work as well. |
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| Author: | steponmebbbboom [ Thu Dec 18, 2003 4:26 pm ] |
| Post subject: | |
If your car doesn't have power brakes, there will be a pipe plug in the #6 intake runner that you can remove and put a spigot in its place. I just do this out of habit; the Toyota 4Y engine wouldn't run the same with the PCV valve unplugged and I couldnt get an accurate reading. Taking your reading in the plugged runner allows you to keep everything else intact. |
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| Author: | Eric W [ Thu Dec 18, 2003 8:48 pm ] |
| Post subject: | |
You can use the vacuum port on the carburetor that your choke pull off line goes to. |
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| Author: | DART68 [ Fri Dec 19, 2003 12:03 am ] |
| Post subject: | |
Thanks guys. I used the choke pull off port. Thanks again |
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