Depending on your cam, some engines just don't generate much vacuum at idle
and a vacuum gauge cannot be used to tune your engine. Nothing to be
concerned about.
Vacuum should be measured off the intake manifold where there are some
ports.
Mike
----- Original Message -----
From: "Napolean Dynamite" <elvis@channel1.com>
To: <datsun-roadsters@autox.team.net>
Sent: Monday, August 11, 2003 6:24 PM
Subject: Low engine vacuum ....
> Hello,
>
> I tried sending this twice before, but I don't think it ever made it.
> Here's one more chance.
>
> Thanks,
>
> Mike
>
> What does it mean when the rpm decreases when spraying starter fluid
> were the air filter meets the carbs. I have been told my car has low
> engine vacuum. I have a U20/SU setup. Should I be looking anywhere else
> for the source of the low vacuum? I sprayed starter fluid all around the
> carbs and linkage and the only place that caused any difference in the
> rpm rate was at the point where the air filter meets the carbs.
>
> How is engine vacuum measured?
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