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re: U20 Engine vacum

To: <datsun-roadsters@autox.team.net>
Subject: re: U20 Engine vacum
From: "Andy Cost" <andycost@earthlink.net>
Date: Thu, 24 Jul 2003 07:30:43 -0500
> I use a motorcycle syncronometer to tune my solexes.  I put a nipple on
each
> of the intake runners where the air pump used to be plumbed.  The
motorcycle
> syncronometer has four tubes with mercury in them.  The vacuum draws the
> mercury up the tubes.  I then adjust the carbs until the mercury in all
four
> tubes is level.  I had #1 and #4 with more vacuum then #2 and #3.  That
> meant that the throttle shafts were bent.  I bent the throttle shafts
until
> all four barrels read the same vacuum.  The vacuum averaged about 18 cm on
> the manometer at 1500 rpms.  That is about 7 inches of mercury.  My cam is
> 296 degrees at .5 lift.  That is a fairly radical race cam.
>
> Andy
>
> Baby and momma doing wonderful!

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