[TPR] Timing adjustments

[shawkins777 at comcast.net]

Asa, 

When there isn't any load on the engine the vacuum will be higher and so will your vacuum advance. Just set your mechanical advance with all vacuum plugged off. 

Steve 

----- Original Message -----

From: "Asa Jay Laughton via TPR" <tpr at teampanteraracing.com> 
To: tpr at teampanteraracing.com, "Daniel C Jones" <daniel.c.jones2 at gmail.com> 
Sent: Tuesday, September 1, 2015 11:09:42 PM 
Subject: [TPR] Timing adjustments 

Alright you gear heads, I think I have a problem with timing. 

I have a dual port (advance/retard) vacuum advance on a stock 
distributor with Pertronix Ignitor III ignition. 
Ported vacuum goes to the advance and manifold vacuum goes to the 
retard. I don't have the instruction handy but that's how I recall it 
was supposed to be hooked up. 

Tonight when tuning, I had 45 degrees of advance at 3,500 rpm. That's 
way too much, but at idle, around 600 rpm, I had zero. This is with all 
vacuum lines hooked up. Therefore it appears I'm getting 45 degrees of 
total movement out of my distributor advance mechanisms (mechanical 
presumably the only thing affecting top end, but wait). 

If I unhook the ported vacuum to the advance portion of the distributor, 
I get way less than 45 degrees at 3,500 rpm. So now I'm a little confused. 

The vacuum advance is adjustable, but I've lost my cheat sheet on what 
to do when what happens; which way to turn for what symptom. 

I dialed the distributor back until I got about 34 degrees at 3,500 rpm 
to be safe, and then adjusted the mixture on the carb to get about 14.2 
on the A/F meter. But now that give me about 10 degree after TDC at 
idle, which just seems wrong. 

I could use a little brainstorming here to help with timing. I'm done 
for tonight but will attack it again tomorrow if I get time, otherwise 
it might have to wait until Friday or this weekend. <sigh> 

Thank you, 
Asa Jay 

-- 
Asa Jay Laughton - W7TSC, MSgt, USAFR, Retired 
& Shelley Marie 
Spokane, WA 
****************************** 
http://www.racingagainstautism.com 
http://www.teampanteraracing.com 
http://facebook.com/racingagainstautism 


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