Steve, I have found that the blue stop bushing and the combination of one
light silver spring and one heavy silver spring seems to approximate the
stock distributor curve for the 289 as listed in the Rootes shop manual. I
tried the two blue springs (more agressive curve) and that worked very well.
Two light silver springs was way too aggressive and it pinged even on
premium.
I have the distributor set up with 34 degrees total advance (roughly 12
degrees at idle) on my engine, which has a 9.3:1 compression ratio with no
pinging on mid grade (89 octane fuel) and it pulls nicely all through the
rev range.
General consensus is that total advance at high rpm is more important than
idle and that you shouldn't go more than 36 degrees. The harmonic balancer
should have an index mark at 36 and a spot of paint will make it easy to see
with the timing light.
. I have experienced a bog something like you describe but I think you are
on the right track regarding carburation or other induction issues. I found
that the completely stock aircleaner (1-1/2 inch filter element) with a deep
breathing 4-barrel 289 doesn't flow enough. Does it happen without the air
cleaner?
----- Original Message -----
From: "Steve Sage" <fastsage@cox.net>
To: <tigers@Autox.Team.Net>
Sent: Saturday, January 31, 2009 1:25 PM
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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