At 10:47 AM 7/24/2013, Alistair Bell wrote:
>I got a value of  (at idle, vacuum hose on/off) 32/38 psi.
>
>Bentley says it should be "approx. 29/36psi.
>
>I'm wondering if my readings are within acceptable range or are
>indeed too high?

I wonder how accurate your pressure gauge is.  The spec I believe is
2.5 bar, and your regulator certainly appears to be regulating.  The
only way to see how it's doing in transient response would be to
use/make a differential gauge that uses manifold pressure instead of
ambient as a reference.  If you did that it should show a basically
static reading of 2.5 bar under all engine conditions.

It's a spring-loaded diaphragm blowoff valve that vents to the tank
return line.  I've never had one apart, but seems to me the spring
could perhaps get weaker but not likely to get stronger, and I don't
*think* there's a lot of opportunity for it to get sticky.  The usual
failure is a leaky diaphragm that pours gas into the manifold through
the vacuum line.

Yrs,
d