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04-19-2024, 02:11 PM | #1 |
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Location: North Coast, Oregon
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Flathead 8 and power brakes.
Howdy all.
I have a 30 Model A I bought off an estate a while back. The owner was going for a 50's 'ish' build. Why am I here rather than the Model A forum? The car came with a 48 truck flathead V8 (that's why i bought it) and a Speedway brake/clutch master cylinder kit. Which has a power master cylinder. Question - Can the flathead provide enough vacuum for the master cylinder? If so, are there any tricks/mods needed to do so, or can I just run the vacuum from the intake manifold? |
04-19-2024, 02:18 PM | #2 |
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Location: Midland Park, NJ
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Re: Flathead 8 and power brakes.
Really need a power brake with a Model A/flathead combo
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04-19-2024, 02:26 PM | #3 |
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Re: Flathead 8 and power brakes.
I would not use engine vacuum. If 12volt car use this..........
https://www.summitracing.com/parts/h...RoC1hgQAvD_BwE |
04-19-2024, 03:33 PM | #4 | |
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Re: Flathead 8 and power brakes.
Quote:
Hella Street Vacuum Pumps 009428087
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The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
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04-19-2024, 03:50 PM | #5 |
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Re: Flathead 8 and power brakes.
thank you petehoovie,
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04-19-2024, 06:51 PM | #6 | |
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Re: Flathead 8 and power brakes.
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Quote:
A good running flathead makes plenty of vacuum (>20 inches). Is there a difference between 6 volt vacuum and 12 volt vacuum? |
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04-19-2024, 10:05 PM | #7 |
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Re: Flathead 8 and power brakes.
In the "notes" section for the above pump it states:
"This is not designed for use with power brakes; it is designed to control vacuum operated accessories. If used in conjunction with power brakes, it may not be sufficient as the main vacuum source". Summit has other pumps recommended for use with power brakes: https://www.summitracing.com/parts/a...9308?rrec=true I kind of agree with tubman above - what vacuum is your engine producing? No matter which way you go, the use of a vacuum reservoir (lots of different ones available) is a good idea in my opinion. |
04-20-2024, 01:17 AM | #8 |
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Re: Flathead 8 and power brakes.
add a vac tank even ford supplied these as an accessory
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04-20-2024, 08:11 AM | #9 |
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Location: Conifer, Colorado
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Re: Flathead 8 and power brakes.
Yours is a 48' engine and mine is s 53', but yes the flathead provides enough vacuum for a power brake system. Mine is a factory Treadle-Vac, power brake booster, with a factory vacuum tank, under the driver side floor, bolted to the frame.
If you are still 6 volt pos ground you can always find and install an Electro-Vac unit. |
04-20-2024, 09:35 AM | #10 | |
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Re: Flathead 8 and power brakes.
Quote:
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The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
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04-20-2024, 09:44 AM | #11 |
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Re: Flathead 8 and power brakes.
I only saw one that comes to mind. It was on a 52/3 ford and had an adapter under the carb with a larh (1/2") line to the master cylinder vacuum unit. Not sure how it worked, it waz along time ago!!
Gramps |
04-20-2024, 11:11 AM | #12 |
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Join Date: Sep 2022
Location: North Coast, Oregon
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Re: Flathead 8 and power brakes.
Thanks everyone.
The car was converted to 12v Neg ground, so it looks like, if needed, one of the aftermarket units should work. I'll check the engine vacuum first. |
04-20-2024, 01:22 PM | #13 |
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Location: Conifer, Colorado
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Re: Flathead 8 and power brakes.
This is how mine is routed, from the back the manifold, to the booster, on my 53' Merc, with a check valve at the booster. The last picture shows the hose coming from the vacuum tank mounted under the car.
Last edited by Merc Cruzer; 04-20-2024 at 02:15 PM. |
04-20-2024, 02:15 PM | #14 |
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Location: sw minnesota
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Re: Flathead 8 and power brakes.
That sure is a tidy lookin engine bay there Mr Merc Cruzer !
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04-20-2024, 02:55 PM | #15 |
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Location: Conifer, Colorado
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Re: Flathead 8 and power brakes.
Thank you, then goal accomplished.
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04-20-2024, 04:29 PM | #16 |
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Re: Flathead 8 and power brakes.
__________________
The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
04-20-2024, 05:08 PM | #17 |
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Location: Lake worth Florida
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Re: Flathead 8 and power brakes.
Check the amps required to run an electrical vacuum pump . I would just run the engine vacuum with a extra holding tank. Easier and probably cheaper . Just my opinion.
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04-22-2024, 10:59 AM | #18 |
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Join Date: Sep 2022
Location: North Coast, Oregon
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Re: Flathead 8 and power brakes.
Thanks everyone for the answers.
I'll check the vacuum and decide whether to use a tank, pump or both. |
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