MTFCA Forum

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.

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.

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

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.

 
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>

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.