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Subject:Vacuum Retard
From:Jay L Snyder
Date:Mon, 6 May 2002 11:05:33 -0400

OK, digijet tuners. I have been running 3 to 5 BTDC initial timing in the
past with my old 1.9l engine.   I am now running a new  Boston Bob 1.9l and
am a little leary of running 5 BTDC with the new engine, although the 1.9
came with a 2.1 pulley and Bob says he tunes all his 1.9s like 2.1s (which
means 5 BTDC).  I am concerned about adding 10 degrees of additional timing
to the top end (cruising speed).  I realize the 1.9 is only running a 7.6:1
CR.  I was wondering if I would be better of disabling the vacuum retard
built into the distributor and working from there.  Without the vacuum
retard, which is 10 degrees, you could start at 5 BTDC and go up from there
and still have less total advance at the end.   The 1.9 runs fine at
highway speed, but I could use a little more grunt up through the gears,
especially third gear.   The vacuum retard goes away as soon as you touch
the gas pedal.  I would rather have a little more advance up through the
rpm range, without the risk of too much total advance.   Any comments?

                                                                  Jay