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08-22-2019, 02:49 AM | #21 |
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Re: The Case of the Gasping Flathead
vacuum should drop to near zero at open throttle but never zero. going from 17 to 13 is not correct. maybe the vacuum is not in the right area. pv wouldn't open on the carbs.
from that video the vacuum is steady. hard to tell from the pictures. being its just armchairing it on the web. Last edited by Tinker; 08-22-2019 at 03:05 AM. |
08-22-2019, 09:52 AM | #22 |
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Re: The Case of the Gasping Flathead
The drop in vacuum is totally dependent on how much the throttle is opened.
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08-22-2019, 01:21 PM | #23 |
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Re: The Case of the Gasping Flathead
Any suggestions?
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08-22-2019, 05:29 PM | #24 |
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Re: The Case of the Gasping Flathead
No, I was just noting that Tinker said a 17 to 13 drop was not correct. It is impossible to say what the drop would be since it totally depends on how far you punch the pedal down. Are you flooring the pedal when you get the 17 to 13 drop?
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08-22-2019, 08:46 PM | #25 |
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Re: The Case of the Gasping Flathead
Listen to Jack.
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08-22-2019, 11:49 PM | #26 |
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Re: The Case of the Gasping Flathead
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08-23-2019, 08:23 AM | #27 |
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Re: The Case of the Gasping Flathead
That would account for a smaller drop.
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08-23-2019, 07:06 PM | #28 |
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Re: The Case of the Gasping Flathead
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08-23-2019, 07:19 PM | #29 |
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Re: The Case of the Gasping Flathead
So do I need to rerun the check at full throttle to have meaningful results?
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08-23-2019, 07:22 PM | #30 |
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Re: The Case of the Gasping Flathead
How are you checking your vacuum?
Yes you can goose the throttle to the floor and check what the vacuum does. Don't leave it to the floor at idle. But it needs to open fully. 17 is still a bit low. you can bring it up to around 19 with the idle/air adjustment screws. Being that the vacuum is steady at 17 idle is a good thing. Just bring it up to 19ish. Set your vacuum with your air clear on too.... its how you are driving the car. . Last edited by Tinker; 08-23-2019 at 07:55 PM. |
08-23-2019, 07:33 PM | #31 |
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Re: The Case of the Gasping Flathead
The video shows that I'm manually moving the throttle while watching the gauge. I'll also adjust the mixture screws.
Thanks for the comments. I appreciate it.
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08-25-2019, 04:36 PM | #32 |
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Re: The Case of the Gasping Flathead
i have a 36 pickup with a 21 stud . its all stock, i had the orignal air cleaner on it. i changed it to one of he little chrome air cleaners, with a K and N filter element.
i could tell the difference as soon as i started to crank over the engine, you could hear it breathe, while cranking. and it ran so much better
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08-25-2019, 08:28 PM | #33 |
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Re: The Case of the Gasping Flathead
As others have mentioned, the original style air filters can be clogged for any number of reasons. Glad you found a solution that meets your needs.
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