What did you do to your C-body today....

barnfind

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Last piece of the puzzle arrived today, anyone know what the are?
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JJ300

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Put mine in a barn for a long winter's nap. Gonna tell everyone next year it was a "Barn Find"...
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TxDon

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I've been spending all my time working on my 34 Chevy so the wagon looks like a shelf again! I did take it out for a good ride this week though.

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Dsertdog

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Took Mz. Ruby across town to a small town Christmas Parade. Put 85 miles on her without a hiccup. Very impressed!
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HWYCRZR

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I started tuning my mechanical advance on my distributor. Low rpm advance spring is stretched. I bent the tab out for a little more tension so Advance wouldn’t start at 600 engine rpm. Fixed it to start with, had engine close to 900 rpm before advancing, but soon seemed to stretch back out and advance back to 600.
Thanks to @halifaxhops for some advice and springs soon on the way.
I am attempting to do this using the car and some math as the distributor machine.

383 2bbl automatic. Standard cam, 91 octane non ethanol gas. Normal elevation.

Basic math
distributor rpm 1/2 of engine rpm
1 degree of distributor advance = 2 degrees of timing advance on flywheel

Basic setting 7-1/2 degrees BTDC
Table below is including 7-1/2 degrees.
Vacuum advance plugged for test.

Distributor advance to Engine advance
(Corrected math)

0 deg@325-475rpm = 7-1/2@650-925

0 - 3.8@475 rpm. = 7.5-15.1@925

7 - 9@750 rpm. =21.5-25.5@1500rpm

14.5-16.5@2250. = 36.5-40.5@4500

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thrashingcows

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A good digital timing light with dial back function and RPM works well for tuning a dizzy as well....that is what I have and use to make sure my dizzies are functioning properly.
 

HWYCRZR

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A good digital timing light with dial back function and RPM works well for tuning a dizzy as well....that is what I have and use to make sure my dizzies are functioning properly.
I am still using my 1985 Stewart Warner basic timing light. No dial back function. That would be helpful at the higher RPMs and adding the vacuum advance to the equation. I have enough indicator to decipher up to 20 degrees and can guesstimate another 10-25, So yes for accuracy I should be using a dial back.
 
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HWYCRZR

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Think you got it not many do
Not so fast, I found a rather large math error above. I forgot to double the distributor degrees before I added the 7-1/2 base timing.
Must have been the carbon monoxide building.
 

78Brougham

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Beautiful Mike! And not one ugly tit to be seen! Even more stunning... Thanks!
You're "Gatekeeper" needs to boot out those two interlopers, so you can have them ALL in a row... Perhaps a switcheroo?
 

HWYCRZR

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A good digital timing light with dial back function and RPM works well for tuning a dizzy as well....that is what I have and use to make sure my dizzies are functioning properly.
You are right a dial back timing light does work quite well. I went out an bought one with the rpm readout and advance readout. Found a 20% off coupon for Advance Auto. Took $99 down to $80.
Thanks to Halifaxhops for advance springs and other goodies. I Almost have my mechanical advance squared away. High rpm is right on spec. Initial mechanical advance kick in is about 200 rpm higher than I want it. One more little tweak with the spring tab and I should be there. At least it isn’t kicking in at idle anymore.
And because everyone likes pictures.
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