Re: Carb suggestions, looking at going Holley-Update
[Re: Belvedere1]
#2430195
01/06/18 09:51 PM
01/06/18 09:51 PM
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Joined: Feb 2005
Posts: 4,314 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,314
Prospect, PA
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Cup your hand to choke it out. It usually takes a me a couple of hand position adjustments. It will choke out and die with or without a vacuum leak. The difference is if there is a leak, there will be an very brief increase in rpm before it dies. It is subtle and pretty quick and you'll need to be listening closely.
Engine has to be fully warmed up. If it dies instantly. No leak and you can move on to the next thing.
I've always been able to identify if there is a leak this way, but not necessarily able to find it with soapy water, or spraying stuff around.
I don't know if this is your problem. As I said, I don't think so, but I'm still not quite following your description. If your idle is what I call "wondering" at idle, I have found that it is either a vacuum leak, or the mechanical advance weights are too week and the timing moves around at idle, especially when you put it in gear.
Good luck.
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Re: Carb suggestions, looking at going Holley-Update
[Re: BSB67]
#2431134
01/08/18 04:41 PM
01/08/18 04:41 PM
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Joined: Jan 2003
Posts: 2,094 central texas
krautrock
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,094
central texas
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but I'm thinking you simply need to get into the weed on your idle tune-up. agreed, first thing i would do is go over the idle tune once it gets completely warm. the motor should be gradually idling smoother and stronger as it warms up until it's finally completely warm.
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Re: Carb suggestions, looking at going Holley-Update
[Re: Belvedere1]
#2433000
01/11/18 08:29 PM
01/11/18 08:29 PM
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Joined: Feb 2005
Posts: 4,314 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,314
Prospect, PA
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Well, it doesn't like the timing at 24, I got it to detonate on moderate acceleration. I changed the advance springs to the lightest silver springs in the kit without much of a difference there. I was home alone so wasn't able to check the in gear timing. I'll play around with it again next week. The timing at 24 was only to see if it had an impact on your idle problem. Any change there?
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Re: Carb suggestions, looking at going Holley-Update
[Re: Belvedere1]
#2433115
01/11/18 11:33 PM
01/11/18 11:33 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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If it's really pinging at light load like that, you need to step up fuel grade or mix imo...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Carb suggestions, looking at going Holley-Update
[Re: Belvedere1]
#2433171
01/12/18 01:32 AM
01/12/18 01:32 AM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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I also didn't reduce the mechanical advance to it was still advancing higher than it should have with 4 more deg of initial. 91 is the best pump gas you can get at 99.99% of stations.
95 is about 5.40/gal and 100 is 7.40/gal Generally what I've seen is as much initial as needed(or locked out)then limit the total to where it's happy octane wise...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Carb suggestions, looking at going Holley-Update
[Re: Thumperdart]
#2433897
01/13/18 02:25 PM
01/13/18 02:25 PM
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Joined: Feb 2003
Posts: 16,147 Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,147
Mesa, Arizona
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I’ve been lurking here listening to all the advice. I’m not a professional tuner but I know enough to keep me out of trouble. With the exception of the heads your engine is about equal to the 451 I had in my Charger. Not really a Holley guy but know enough to be dangerous.
From the latest postings it’s sounding more and more to be ignition. Having not seen your car in over a year it would be hard for me to comment. Let’s say we get together and solve this problem. Just set aside a day to give us time. Between the two of us we should be able to solve the problem. Send me a PM or text me. I know you have a busy work schedule but being retired I’m flexible.
“So if it’s on the internet it must be true”
Abe Lincoln
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