Jeff
What Carb are you using? What size jets? Have you checked and
graphed your advance curve?
Idle rpm seems about right. Initial timing seems high but I don't know
your engine configuration.
Chugging could be a loss of vacuum, carb is too big or advance is too much.
The best way to adjust the carb is with an O2 sensor but that's probably not
an option here.
Engine warm - set idle to 1000 rpm - use vacuum gage to obtain highest
vacuum level while adjusting idle screws - drop rpm to idle - test drive -
if OK your done.
If not adjust idle screws at idle with rpm - find the point where the rpm
drops off turning idle screws in and out - set screws to about the middle of
that range - test drive.
Ron Fraser
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Jeff Holt
Sent: Friday, October 28, 2011 10:27 PM
To: tigers@autox.team.net
Subject: [Tigers] Timing and Carb adjustment
I'm doing the initial adjustments on this 302 with the T-5 replacement.
So, I finally got the full advance worked into the timing. The problem was
the idle was too high, 1350 rpms. So when I adjusted the idle down to 750
RPM-800 RPM, I set the initial (no-vacuum) advance at 15 degrees before top
dead center, and the advance at 3000 (all-in) was 36 degrees before TDC. Is
that idle correct?
The drive around the block was much better this time but the engine
backfires a lot when I back off the accelerator, and it "chugs" badly in
second gear, just cruising down a low speed street. I am assuming this is a
too lean mixture? Any thoughts on the carb adjustments I should follow?
Mixture?
Jeff Holt
Huntsville, UT
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