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Triumph Torque    Cars    Herald/Vitesse  ›  Vacuum Guage
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Matt306
March 13, 2017, 9:30pm Report to Moderator

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I put one of these in my Herald, tapping the manifold for the vacuum take off.

I connect a new vacuum guage and get steady reading of 20in  on the dial.

If i switch back to this one http://i.ebayimg.com/images/g/wkUAAOSwImRYZDoj/s-l400.jpg the vacuum increases. by around 5in. Now this is of course not crucial in the running of the car but its nice to have it reading something near correct. Any calibration i can do on the guage?


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Matt306
March 13, 2017, 9:45pm Report to Moderator

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Trying to answer my own question I seem to be missing a Restrictor as on page 2 here http://www.magical.eclipse.co.uk/impclub/VacuumGauge.pdf


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Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
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Matt306
March 13, 2017, 9:45pm Report to Moderator

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Trying to answer my own question I seem to be missing a Restrictor as on page 2 here http://www.magical.eclipse.co.uk/impclub/VacuumGauge.pdf


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
Triumph 1000cc 1991 Daytona got to go to pay for Yellow Peril
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nang
March 14, 2017, 3:53am Report to Moderator

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A restrictor would just slow the movements of the needle. Probably like most small gauges, not too accurate, either of them....Beware the Ides of March.
Tony.


If all else fails-Read the Instructions! ��Wairoa
New Zealand

1976 2500TC (converted to S spec) owned since 1998.

1999 BMW 2800 cc Z3 Convertible.
 
2003 BMW 525i Touring.
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mazfg
March 14, 2017, 7:38am Report to Moderator


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As Nang says, the restrictor only slows the movement of the needle. I made one up with a piece of copper tube and squeezed it until the needle stopped flickering. Reads pretty steady now and around 18" on my gauge. Again, not sure how accurate that is..but it;s more about what the needle does, than where it is .


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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Matt306
March 14, 2017, 8:53am Report to Moderator

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Mine doesn't move that much anyway pretty steady at 20in


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
Triumph 1000cc 1991 Daytona got to go to pay for Yellow Peril
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Pete Lewis
March 14, 2017, 9:15am Report to Moderator

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Simplest way to damp any needle vibration is to add a short bit od bundy  and just close it down with some pliers till you get a steady reading

typical at idle is 18ins hg to 20     21 is a bit high,  advancing raises the readings  retard reduces

On over run around 25 , 26 in hg
Incorrect idle ssettings will also affect all reading

Calibration needs a vacuum source a glass tube and a some mercury

ie 18in hg   means a vacumm will support a column of mercury 18"  in height

so I would use the gauge as a indicator , not a accurate measuring device,  

If the static timing and idle speeds are set then expet the gauge to read 18 to 20 at idle

pete



1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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Matt306
March 14, 2017, 9:32pm Report to Moderator

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not using it as an accurate read, i have a Sealey guage for that,This reads around 20in. The guage in the car reads 25.  I have another vacuum tester so will go for an average of three perhaps!


Worcestershire Area Organiser search Facebook for Club Triumph Worcester
Triumph 13/60 1970 Convertible  first car restoration, many botches much learnt... Now back MOTd and Taxed... 2016 RBRR COMPLETE
1974 Spitfire Mk IV in Yellow and Rust... for restoration
Triumph 1000cc 1991 Daytona got to go to pay for Yellow Peril
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