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Old 08-25-2017, 05:40 PM   #196
428street
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

Still alive. Got caught up in a side project with my exhaust which led into areas I should not have gone in but I did. I'll spare you the details. I'm getting new exhaust pipes made and should have everything back together by Tuesday. I'll update then.
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Old 03-04-2018, 05:01 PM   #197
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

SB, I'm back from the dead. Truck has been running well and I've done a bunch of other work on it. Basically took part the entire dash and fixed vacuum wiper, radio, cig lighter, speedo, etc. Repacked the rear axle bearings, new heater motor in heater box, etc.

So back to my carb issues So I was able to get some local help from an old racing/carb guy I know from a past time in my life.

He doubled checked all my work and said "I" did a good job - with your help and others. He made some minor air/fuel adjustments and said the bowl level for fuel was not correct so he adjusted that. One question he had which I could not answer was the vacuum coming off the new 2300. He didn't know what was normal not do/did I. He asked if there was or should be a vacuum port at the throttle plate. He said the way its setup now the vacuum port seems to physically be to high on the carb itself (I forget exactly what he told me) but his point was the vacuum port was to high on the carb and I think he said it was a constant vacuum and that it should not be.

There is a large diameter port off the back of the 2300 but he said that was to big.

He also told me that my vacuum advance and mechanical advance on the current dizzy is not working. The plate seems to be stuck. We checked the screws to see if they were to long but they were not. He could not move the plates in the dizzy at all and he said that is a problem.

So, any answers to my above questions which I hope make sense. I'm still learning and have increased my knowledge but still need to learn more.
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Old 03-04-2018, 07:49 PM   #198
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

Whoa dude. Blast from the friggin past. I thought you'd fallen off the face of the earth. If you and your helper are wondering about the vacuum port location for the vacuum advance coming off the metering block as shown in one of your most recent pics...that is the correct location. Its whats known as a "metered" port. There is little to no vacuum signal there while the engine is idling...a neat trick since manifold vacuum is at its highest when the engine is idling. But that's what you want for the vacuum advance. A metered signal with little to no suction at idle, but comes on as you increase throttle.
No vacuum advance function in your distributor is certainly a problem.
No mechanical advance though, is an even bigger problem. You need to yank that distributor and either tear into and refresh, or replace it with one in better condition. I can't believe you're even able to drive it at all with a sticking mechanical advance. That should be nearly impossible.
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Old 03-05-2018, 03:10 AM   #199
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

Ahhh, you still love me

Ya, I had to take a break plus it's cold as heck here in New England so not much work going on. I do have the Scout in the garage but still not super warm plus all the stuff I was doing was not carb related.

So, back to my carb. Ya, the plates definitely are no working for the V/A and he said the mechanical was not working or working very little because he said that lobe/eccentric should have some back and forth movement and should "click" a little but mine does not.

Already making plans for new or rebuilt stuff.
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Old 03-05-2018, 03:14 AM   #200
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

Is there any take apart for the dizzy on here or any place you know about? I certainly can and will look too. My gut is just to get a rebuilt unit and start with a known good then keep the original core and try to rebuild myself for the learning experience.
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Old 03-05-2018, 04:44 AM   #201
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

He said he's looking for ported vacuum...
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Old 03-05-2018, 06:32 AM   #202
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

Quote:
Originally Posted by 428street View Post
He said he's looking for ported vacuum...
That should be the ported location off the metering block. I meant to say ported when I said metered by mistake earlier.
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Old 03-05-2018, 06:39 AM   #203
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

Thank you sir...
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Old 03-05-2018, 06:54 AM   #204
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

How do I verify if the dizzy is CW or CCW rotation?
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Old 03-05-2018, 06:56 AM   #205
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

Its clockwise rotation.
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Old 03-05-2018, 07:02 AM   #206
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

As to your dizz rebuilding question, my best suggestion is to refer you to the appropriate section in your manual. The manuals were intended for consumption by the trained IH technicians of the day and not us Joe Shadetrees 50 years removed. My limited searches online did not turn up any pertinent how to write-ups or videos on youtube.
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Old 03-05-2018, 07:39 AM   #207
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

Fair enough sir. As stupid as this sounds I ALWAYS forget to look in my manual which I bought to learn and use.
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Old 03-14-2018, 06:48 PM   #208
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

I'm baaaaaack! lmfao.

OK, so going to install my pertronix I2 module and the directions state that if you have a BR or RW to take it out for best performance. So I ask this question, seeing this isn't a race truck and I'm fairly certain taking the stock resister wire out would be a PITA, what would happen if I just left it in the system?

BTW, this is for my 70, 304 V8.

I did confirm months ago that I do have a stock green wire with white cloth covering the RW coming out from the ignition switch.
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Old 03-14-2018, 07:03 PM   #209
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

I remember the saga of the resistor wire. I was so convinced that it had to be under the hood and you kept saying that you thought it was under the dash. You were right and I was wrong. Could you simply disconnect the resistor wire at the IGN switch, leaving the wire alone and run a new wire from the IGN out to the coil POS terminal? I mean, if you don't actually remove the wire from the loom, but just leave it lay unhooked at both ends, wouldn't that solve the issue? That module is designed to run on full voltage. I'd do what I could to make that happen if it were my setup.
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Old 03-15-2018, 11:28 AM   #210
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Default Re: Need help with vacuum advance with 304 and 2300 Holley

I was afraid of that answer. Thats a real PITA because my RW starts at the spade on the connector that plugs into the IS and then goes to the back side of the firewall plug connector. I'd have to do some work and not super comfortable ripping the wire out of the connectors on both sides. I just don't want a mess or more issues then what I started with but I understand that is my call.

I did call Pertronix tech support and got some idiot which I think I knew more about the unit then he did and thats not saying much. He said it would work fine with the stock RW in place but the voltage will not be as high as if I took it out.

Another trusted IH guy I know has all pertronix units in his IH's and he's aways just installed the EI and been done with it...he has some SII's and medium duty trucks. He said none of his trucks had external BRs but fairly certain they also have what I have which is the RW from the ignition switch.
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