Earl, Bob
Has made me wonder as well.
I had my original bj8 girling mk2a booster rebuilt by Past Parts lts here in
the uk.
The test figures they supplied for the rebuilt unit are:
primary
bar = 20
vacuum = 24
boost = 3:1
secondary
bar = -
inhg = -
bar = 58
These figures show the boost is stated as 3:1 and the difference in pressure
readings on primary and secondary (bar) are more like a ratio of 2.9:1
I believe the later girling mk2b had varying ratios from 2.75:1 and 2:1 with
the powerstop at 1.5:1
Have not tested mine on the road as still dont have the prop shaft fitted.
hope this helps
cheers Andy
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