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EFV-8 Club Forum / General Ford Discussion / Inches of vacuum

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Discussion Topic: Inches of vacuum -- page: 1 2 3

mfirth

04-07-2020 @ 5:47 AM

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What is good vacuum for an 8BA ? I accidentially pulled the wiper hose off of the intake & it didn't feel like very much vac there.
I'm gonna check it today to see what it's pulling.The engine only has 1200 miles on it.
Thanks guys !!!!

mike

JT Ford

04-07-2020 @ 1:28 PM

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19 to 20

mfirth

04-07-2020 @ 5:16 PM

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Thanks JT ! Only showing 14 inches......leak some where.

39 Ken

04-08-2020 @ 5:06 AM

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Here is a link to vacuum readings that will indicate if you have a leak and where.
Hook up your gauge and see what it does.

https://www.onallcylinders.com/2015/05/08/quick-tech-how-to-read-a-vacuum-gauge-to-pinpoint-engine-problems/

mfirth

04-08-2020 @ 5:33 AM

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Thanks fellas! When it stops raining, i may go to it again. Ken, thanks for the link, most helpful.
mike

37RAGTOPMAN

04-08-2020 @ 5:46 AM

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hi
I took a photo of a Vacuum gauge,
is the engine running smoothly ?
is the needle steady at 14 ,
hope this helps 1937Ragotpman

mfirth

04-10-2020 @ 4:52 AM

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Thanks all ! Looks like a possible burn through of the heat riser on the intake. Can find no external leak.
Will pull the intake next week & check it out. We'll see.................. thanks again!
mike

40 Coupe

04-10-2020 @ 8:04 AM

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Before you pull the intake have you adjusted the carburetor mixture adjustment screws while the engine is hot. Adjust each screw for the highest vacuum reading, then readjust each. Then after adjustment what is the vacuum reading?

This message was edited by 40 Coupe on 4-10-20 @ 8:06 AM

51woodie

04-10-2020 @ 8:51 AM

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After you do as 40Coupe suggested, and if there is little or no change, you can check for leaks around the carb, carb shaft, carb mount gasket, and around the intake manifold to block mating surfaces, by using an unlit propane torch. With the engine running at idle, turn the torch on half open, then move the head of the torch close to and around the areas noted above. The engine will speed up if there is a leak. You can do an initial test, by removing the wiper hose from the port and "feed" propane at the port. I'm sure there are all sorts of precautions I didn't mention (and I'm sure someone will), but I haven't blown anything up, singed my eyebrows or burned down my garage.... so far.

mfirth

04-10-2020 @ 11:53 AM

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40 Coupe & 51woodie, thanks, but i've already done all that you sugested & it didn't change much. When i give it some throttle i can hear what sounds like an exhaust note coming from the carb. It is strange at best.
Thanks fellas !

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