Vacuum

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Craig Leach
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Vacuum

Post by Craig Leach » Mon May 23, 2022 9:26 pm

I think I have seen vacuum gauges on Montana 500 dashes in the past. If not has anyone run a vacuum gauge on there model T and know what the vacuum is under acceleration? I know this changes with altitude just looking for ball park figure from hard acceleration to WOT.
Thanks.
Craig.


got10carz
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Re: Vacuum

Post by got10carz » Mon May 23, 2022 10:18 pm

Under WOT, manifold vacuum would be near zero. Ported vacuum would be high, maybe 25-30 inches vacuum. No way on a stock T carb to measure ported. The difference between ported and manifold is which side of the throttle plate it is measured.


jiminbartow
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Re: Vacuum

Post by jiminbartow » Mon May 23, 2022 10:50 pm

Craig, you can still delete the other 2 vacuum posts as long as you are the only poster (0 posts). You cannot delete it if another member has posted a response. Jim Patrick


Scott_Conger
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Re: Vacuum

Post by Scott_Conger » Mon May 23, 2022 11:06 pm

Probably the greatest benefit would be in ensuring optimum ignition timing (timer advance)

any other reading would be simply motor diagnostics (worn rings, guides, etc), and all that would be remedied before any serious competition. Once everything is mechanically optimal, then you're simply back to monitoring ignition timing.
Scott Conger

Tyranny under the guise of law is still Tyranny

NH Full Flow Float Valves
Obsolete carburetor parts manufactured

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BE_ZERO_BE
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Re: Vacuum

Post by BE_ZERO_BE » Tue May 24, 2022 10:39 am

 
Seems to me that if the little rubber hose "accidently" came off of the vacuum gauge,
there would be a path for additional air intake around the carburetor !

Just say'n. <grin> :roll:
Respectfully Submitted,
Be_Zero_Be

I drive a Model T ... Microseconds don't matter :D

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Topic author
Craig Leach
Posts: 1436
Joined: Tue Jan 08, 2019 12:22 am
First Name: craig
Last Name: leach
* REQUIRED* Type and Year of Model Ts owned: 1919 Firetruck/1922 Speedster
Location: Laveen Az
MTFCA Number: 26647

Re: Vacuum

Post by Craig Leach » Tue May 24, 2022 12:43 pm

Thanks for repairing my double post. I'm not trying to diagnose a problem quite the contrary I'm trying to evaluate some performance changes I have made. Not to worried about the hose coming off if it does I have a gauge that will let me know immediately. ;)
Thanks.
Craig.

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