Steve
First I assume that for total advance you mean initial timing plus
mechanical timing. Total advance is related to the compression ratio of
the engine and your engine components. Less compression generally means
you can add more total advance. Total advance of 35 - 38 sound about
right; you might be able to push out to 40.
Vacuum advance, the cruise economy side of timing, can pull advance out to
50 or so.
I always recommend reading "Timing is everything" on FordMuscle.
http://www.fordmuscle.com/archives/2000/03/timing/index.shtml
You should always check the timing curve so you know exactly what you have
and when.
Check the mechanical timing at 500 or 1000 rpm increments up to 3000 rpm
plus take vacuum readings.
Check vacuum advance at idle with a hand held vacuum pump w/gage, from 1 to
max reading for your engine.
Record all values; this is your advance curve. Compare it to the one in the
shop manual.
The bog is probably in the carb setup. The real question is; is it going
too lean or too rich?
Can you disconnect the secondaries so you know it is in the secondary
circuit?
Secondary jets could be too big or too small. I don't normally work with
4bbl carbs, so I'm guessing here.
I had some ticking noise in the lifters until I changed the 20-50w oil for
10-40w oil.
Ron Fraser
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Steve Sage
Sent: Saturday, January 31, 2009 4:25 PM
To: tigers@Autox.Team.Net
Subject: [Tigers] Distributor and Other Advice Needed
Hello Tiger Fans:
Jane and I will be Tigering to SUNI this summer so we'll see you all
(hopefully) there. For anyone who hasn't gone to one of these, it's
definitely been worth it in the past.
I just installed my new MSD 8350 distributor (with vacuum advance) on my
289 Tiger and could use some advice from any distributor knowledgeable
people, being the super mechanic that I am. I've used the lightest
advance springs and set initial advance around 15 degrees (suggested by
the speed shop where I bought it). I've since worked on the advance and
set it a bit further forward for some more fun. It still idles great,
starts right up, and pulls well from a stop (except for a bog around
1700-1900 RPM that I think is carb related) and doesn't ping. The power
curve seems to level out sooner than I want though.
The distributor comes with four advance stop bushings to try. The shop
suggested I use the black bushing which adds (according to the chart
that came in the box) about 18 degrees to initial advance, which gives
me probably around 35-38 degrees total advance now. The kit has three
other bushings that will add progressively more total advance so my
question is, how much total advance can a 289 safely use?
On my "bog" around 1700-1900 RPM; is that always caused by secondaries
coming in too soon? I've changed to a stiffer spring in the vacuum
advance pot, but still get a bog. The stiffer spring doesn't seem to
make much difference, if any. Any suggestions on how to proceed?
Finally, I've started to hear a little "ticking" noise from under the
hood (my perception anyway), especially under hard acceleration. It's
not from pinging, as far as I can tell. I've had that before and this is
different. You can hear it at idle when cold, but not very noticeable
until I step on it. It was doing this before my distributor change and
was a new noise then. It doesn't seem to affect performance in any way,
other than making me a bit nervous. Is there any way to definitively
diagnose such a noise? Without hearing it I know this is just guess
work, but any ideas would be appreciated.
Steve Sage
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