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#2421203 - 12/19/17 08:27 PM Re: Carb suggestions, looking at going Holley [Re: Thumperdart]
Belvedere1 Offline
super stock

Registered: 01/20/03
Posts: 1144
Loc: Phoenix, AZ
1.45 venturi and 1.75 throttle blades. Its supposedly flows 950 cfm but I'm not convinced.

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#2421205 - 12/19/17 08:30 PM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
Thumperdart Offline


Registered: 07/12/04
Posts: 18547
Loc: State of confusion
Not quite but should work..........
_________________________
72 Dart 470 n/a BB stroker street car `THUMPER`.....Check me out on FB for stories, videos and lots of carb pics..........760-900-3895........

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#2421234 - 12/19/17 09:03 PM Re: Carb suggestions, looking at going Holley-Update [Re: Thumperdart]
Belvedere1 Offline
super stock

Registered: 01/20/03
Posts: 1144
Loc: Phoenix, AZ
I agree, as long as its not less than 800 I don't really care.

Update:

I got the carb on and the car running again. It runs great right out of the box, the one and only adjustment was the idle speed. The float levels were spot on too. It was tweaked slightly from the box stock settings by the guy I bought it from. It seems that he nailed the settings. Jet 78/86, 4.5 power valve, rear blocked, idle restrictor .037, idle bleeds .030, high speed .073, 35 squirters front and rear, 30cc cam in front and 50 in rear. The only issue that is still there that I had with the Edelbrock 800 is at a warm idle when the engine starts to shudder like it drops a cylinder then picks back up again. The idle is better with this carb but the shuddering is still there. I'm at a loss from where to go from here on that.


Edited by Belvedere1 (01/03/18 05:59 PM)

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#2428488 - 01/03/18 06:19 PM Re: Carb suggestions, looking at going Holley-Update [Re: Belvedere1]
Belvedere1 Offline
super stock

Registered: 01/20/03
Posts: 1144
Loc: Phoenix, AZ
BTT

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#2428560 - 01/03/18 08:04 PM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
71pan Offline
enthusiast

Registered: 06/03/05
Posts: 248
Loc: central Pa.
Holley 3310 heavier vehicle street driven that's what I would buy get secondary spring set and forget it and run it

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#2428773 - 01/04/18 08:13 AM Re: Carb suggestions, looking at going Holley-Update [Re: 71pan]
Belvedere1 Offline
super stock

Registered: 01/20/03
Posts: 1144
Loc: Phoenix, AZ
That would be a major step down from what I just bought, IMO.

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#2428916 - 01/04/18 12:24 PM Re: Carb suggestions, looking at going Holley-Update [Re: Belvedere1]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 30534
Loc: Bend,OR USA
Look for a vacuum leak or a bad spark plug wire or spark plug scope
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2429246 - 01/04/18 08:37 PM Re: Carb suggestions, looking at going Holley-Update [Re: Cab_Burge]
Belvedere1 Offline
super stock

Registered: 01/20/03
Posts: 1144
Loc: Phoenix, AZ
Fresh plugs, have inspected every inch of each wire and boot and no sign of anything that looks suspect on those. Ive done all the vacuum leak checks known to man and cannot find one. I may try and crank the timing to 24 intial and see if that changes anything???

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#2429312 - 01/04/18 11:49 PM Re: Carb suggestions, looking at going Holley-Update [Re: Belvedere1]
AndyF Offline
Too Many Posts

Registered: 01/20/03
Posts: 23806
Loc: Oregon
You might need to get the car on a scope to trace down a problem like that. My guess is that it is electrical and probably something thermal related. Most likely a bad coil or a bad part in the ignition box. When it gets hot you have a solder joint opening up or something like that. Very hard to find without a scope or other test equipment. If you have a buddy who has the same ignition system as you maybe you can swap coils and boxes and stuff like that until you run it down. I doubt it is carb related.

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#2429344 - 01/05/18 03:22 AM Re: Carb suggestions, looking at going Holley-Update [Re: Belvedere1]
71pan Offline
enthusiast

Registered: 06/03/05
Posts: 248
Loc: central Pa.
That's hard to say unless you make back to back passes bench racing YES

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#2429376 - 01/05/18 08:06 AM Re: Carb suggestions, looking at going Holley-Update [Re: AndyF]
Belvedere1 Offline
super stock

Registered: 01/20/03
Posts: 1144
Loc: Phoenix, AZ
The baffling part is that its just the idle only but anything is possible with electrical issues in my experience. I started down that road a few months back with swapping to an old known good orange box and a stock coil with no change. I'm using a chrome box and an MSD Blaster coil. I'll see if a buddy of mine still has his scope at his shop.


Edited by Belvedere1 (01/05/18 08:10 AM)

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#2429657 - 01/05/18 07:27 PM Re: Carb suggestions, looking at going Holley-Update [Re: Belvedere1]
BSB67 Offline
master

Registered: 02/19/05
Posts: 3465
Loc: Prospect, PA
Originally Posted By Belvedere1


......The only issue that is still there that I had with the Edelbrock 800 is at a warm idle when the engine starts to shudder like it drops a cylinder then picks back up again. The idle is better with this carb but the shuddering is still there. I'm at a loss from where to go from here on that.


Can you add some more description around this? Not real clear what happens and when.
_________________________
500" NA, Eddy head, pump gas, exhaust manifold with 2 1/2 exhaust with tailpipes 4150 lbs with driver, 3.23 gear, stock converter 11.68 @ 120.2 mph

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#2429712 - 01/05/18 09:24 PM Re: Carb suggestions, looking at going Holley-Update [Re: BSB67]
ccdave Offline
The Ultimate

Registered: 01/22/03
Posts: 1734
Loc: Mopar Country, Mi
These Thumper carbs are very nice up


Attachments
A93BEC2B-1915-493B-B634-8663484FA710.jpeg

Description: These Thumper carbs are very



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#2429741 - 01/05/18 10:47 PM Re: Carb suggestions, looking at going Holley-Update [Re: BSB67]
Belvedere1 Offline
super stock

Registered: 01/20/03
Posts: 1144
Loc: Phoenix, AZ
At anything from just a couple minutes after start up to just about 180 on the water temp gauge the idle is smooth or as smooth as it can be given the cam with a very consistent idle. When the temp gets to normal operating the idle rpm in gear will get a little erratic almost to the point of it feeling like it drops a cylinder and picks back up and then feels like a miss again, and on and on. In gear idle is around 800 and in park it will smooth out slightly at around 1000 to 1100. The best vacuum reading I get is 10 with an initial timing setting of 20. I thought the problem with the old Edelbrock carb was it not getting a decent vacuum signal causing the metering rods to bounce up and down and the carb to hunt between the idle and main circuit. This new carb made things overall slightly better.

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#2429742 - 01/05/18 10:49 PM Re: Carb suggestions, looking at going Holley-Update [Re: ccdave]
Belvedere1 Offline
super stock

Registered: 01/20/03
Posts: 1144
Loc: Phoenix, AZ
That looks too nice to get dirty! He is great and helped me a ton in choosing the carb I bought.

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#2429771 - 01/06/18 12:05 AM Re: Carb suggestions, looking at going Holley-Update [Re: Belvedere1]
Dave Hall Offline
top fuel

Registered: 01/21/08
Posts: 1789
Loc: Cotati, CA
Fat it up a taste and see what happens. The low vac. signal probably isn't allowing the manifold to get "wet". I have a 400 with a big cam and I had to make it idle a little fat but it's happy.

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#2429912 - 01/06/18 11:05 AM Re: Carb suggestions, looking at going Holley-Update [Re: Belvedere1]
Thumperdart Offline


Registered: 07/12/04
Posts: 18547
Loc: State of confusion
Do your self(and us)a favor and install a wide band and venture into the REAL tuning zone but be prepared to learn more about carbs than you imagined and have a damn near EFI running machine.......... beer
_________________________
72 Dart 470 n/a BB stroker street car `THUMPER`.....Check me out on FB for stories, videos and lots of carb pics..........760-900-3895........

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#2430029 - 01/06/18 01:26 PM Re: Carb suggestions, looking at going Holley-Update [Re: Thumperdart]
Belvedere1 Offline
super stock

Registered: 01/20/03
Posts: 1144
Loc: Phoenix, AZ
I tried another stock parts store replacement ECU I find that I didnt realize I had with no change on the idle. I'll throw another coil on there the next time I get the car out. I tried an extremely rich jet and rod combo on the old carb and that didnt help the situation either. I totally agree on fine tuning with a wideband but how useful would it be just to establish a base idle and is there a such a thing as a no weld O2 bung kit?

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#2430036 - 01/06/18 01:41 PM Re: Carb suggestions, looking at going Holley-Update [Re: Belvedere1]
Thumperdart Offline


Registered: 07/12/04
Posts: 18547
Loc: State of confusion
You can buy the clamp to the exhaust deal or just chassis dyno it then tune to suit your needs but even dynos run WB's it's the BEST and you're guessing otherwise............


Edited by Thumperdart (01/06/18 01:41 PM)
_________________________
72 Dart 470 n/a BB stroker street car `THUMPER`.....Check me out on FB for stories, videos and lots of carb pics..........760-900-3895........

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#2430038 - 01/06/18 01:42 PM Re: Carb suggestions, looking at going Holley-Update [Re: Belvedere1]
BSB67 Offline
master

Registered: 02/19/05
Posts: 3465
Loc: Prospect, PA
Originally Posted By Belvedere1
At anything from just a couple minutes after start up to just about 180 on the water temp gauge the idle is smooth or as smooth as it can be given the cam with a very consistent idle. When the temp gets to normal operating the idle rpm in gear will get a little erratic almost to the point of it feeling like it drops a cylinder and picks back up and then feels like a miss again, and on and on. In gear idle is around 800 and in park it will smooth out slightly at around 1000 to 1100. The best vacuum reading I get is 10 with an initial timing setting of 20. I thought the problem with the old Edelbrock carb was it not getting a decent vacuum signal causing the metering rods to bounce up and down and the carb to hunt between the idle and main circuit. This new carb made things overall slightly better.


Okay. Thanks

I still would not rule out a vacuum leak, but I'm thinking you simply need to get into the weed on your idle tune-up. That size cam at 800 rpm in gear needs to be right, IMO. Without an A/F meter, I would maybe start with a bit more initial timing (make sure that it is not moving between 800 and 1100 rpm too) and try a bit fatter.

The only vacuum leak method that always works for me is the simple hand over the carb test.
_________________________
500" NA, Eddy head, pump gas, exhaust manifold with 2 1/2 exhaust with tailpipes 4150 lbs with driver, 3.23 gear, stock converter 11.68 @ 120.2 mph

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