 Manifold vacuum under real world driving and decel, Anyone have data on this? |
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| emerygt350 |
 May 27 2022, 06:46 AM
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Advanced Member  Group: Members Posts: 2,882 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States  |
After pbanders alerted me to the error in the decel diagrams, and I hooked the darn thing up correctly, I have been wondering what the actual vacuum while driving looks like for others.
I have a glowshift vacuum gauge on the dash (from tuning the MPS) and have been watching the max vacuum on decel, idle, cruise etc. On a hot engine at 900 rpm idle I pull 17ish pounds. On decel 23ish pounds. Hooked up my vacuum pump to the decel valve while idling and gave it some vacuum. No change in idle till 20ish, then increasing RPM from 20 to 28 pounds. Bench testing the decel showed opening at 18 lbs. I can't imagine many of you have a vacuum gauge on the dash but perhaps the bluetooth 123 records that kind of stuff? 73 2.0 djet. |
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| emerygt350 |
May 29 2022, 03:54 AM
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#2
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Advanced Member Group: Members Posts: 2,882 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Ahh, and where is that vacuum line hooked up? Tb or manifold?
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Posts in this topic
emerygt350 Manifold vacuum under real world driving and decel May 27 2022, 06:46 AM
Van B Decel valve has a bit of a progression to it. Tha... May 27 2022, 03:58 PM mgphoto My 123 has the vacuum hose hooked up but I’m not... May 27 2022, 05:02 PM mgphoto Spent some time today watching the vacuum gauge du... May 28 2022, 03:59 PM emerygt350 Interesting! I assume you have a decel valve? May 28 2022, 05:05 PM
mgphoto
Interesting! I assume you have a decel valve... May 28 2022, 05:28 PM mgphoto
Ahh, and where is that vacuum line hooked up? Tb ... May 29 2022, 08:21 PM GregAmy Per my logs, 45.3 kPA typical at idle.
A brief sc... May 29 2022, 05:34 AM |
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