2013-12-31 01:27:50 UTC
an an '01 sv650s acually does something? The existing system seems
to allow air injection at manifold vaccum below about 450 mm, or
about roughly 18" Hg. It seems to close off completely at vacuum
greater than about 20".
The spec in the manual is fairly close to unintelligible, though
it's tempting to think that PAIR operation is allowed at extreme
high and low manifold vacuum, with a cutoff in the mid-range. It
makes sense after a fashion, since HC emission is an issue mostly
at low speed (low combustion temps) and WOT (rich mixture).
The wording in the manual (including typos) is:
"Apply nefative [sic] pressure slowly to the control valve and blow
the above manner." Meaning to blow in the direction of intended airflow,
I think. So far, so good. Now the fun part:
"If air does not become flow out within the specification the control
valve is normal condition". Next, it says:
"Negarive [sic] pressure range 230-400 mm HG"
Does anybody know the intended meaning? I take it to mean the PAIR system
should admit fresh air to the exhaust when the manifold vacuum is below
230 mm or above 400 mm. If so, that's not what happens and might explain
some rough running problems.
Thanks for reading,