Idle = 20inhg or 67kpa
Full throttle = 1inhg or 3kpa
What type of manifold do you have?
Kpa At Idle
Started by
germini30
, Jun 01 2018 05:59 PM
17 replies to this topic
#16
timmy850
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Posted 02 June 2018 - 10:25 PM
I’ve got one of the coloured Smiths Vacuum gauges and my car runs exactly on the marked sections.
Idle = 20inhg or 67kpa
Full throttle = 1inhg or 3kpa
What type of manifold do you have?
Idle = 20inhg or 67kpa
Full throttle = 1inhg or 3kpa
What type of manifold do you have?
#17
mini13
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Posted 03 June 2018 - 09:15 AM
The smiths gauge will be referenced to atmospheric pressure rather than absolute, So in megajolt terms that will be 100 kpa at full throttle and 36kpa at idle.
#18
Ethel
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Posted 03 June 2018 - 11:33 AM
The scales are also going in opposite directions: mm/hg is measuring pressure drop from atmospheric. Pascals are measuring absolute pressure- Zero is perfect vacuum (in theory), one Pascal is one Newton (0.1kg-ish) per square meter.
Atmospheric pressure would be 0mm/hg or 1bar = 100kpa = 14.5psi.
99kpa equates 7.5mm/hg, 98kpa is 15mm/hg......
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