Edelbrock accelerator pump adjustment question
#1300537
09/09/12 06:38 PM
09/09/12 06:38 PM
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David_Trimble
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Are the accelerator pump nozzles changable on 1405 Edelbrock carbs? I noticed that if I blip the throttle hard enough ( this is on a 1969 Charger 383 4bbl stock squarebore iron intake, 4-speed trans in neutral) I get a stumble. No backfire, just a momentary stumble as the engine revs up. I thought the accelerator pump was running rich so I set the pump lever to it's leanest setting (what I think is the leanest setting- the bottommost hole in the pump lever), and while it seems to have helped, the stumble is still present. I'm trying to figure out how to lean the pump out further- is it possible to change the jet size on the accelerator pump nozzle to something smaller, or does something else need to be rejetted/adjusted?
Again-thanks.... David
'69 Dodge Charger R/T
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300538
09/09/12 06:55 PM
09/09/12 06:55 PM
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RapidRobert
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eyeball the squirt & see if it appears to be of adequate duration with IMMEDIATE tip in. This is with it warmed up so it's not a choke issue correct? float level correct & initial in the ballpark? Any lean stumble issues anywhere else? Reportedly 1405's are jetted on the rich side. Yes the nozzles are interchangeable. EDIT I believe you are too lean rather than too rich & this is a pretty much stone stock 383 right? I'd put the lever closer to the fulcrum and I'm thinking float level/timing/vac leak unless the accel pump itself has a problem
Last edited by RapidRobert; 09/09/12 07:07 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300540
09/09/12 07:27 PM
09/09/12 07:27 PM
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David_Trimble
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I'm going to amend the symptoms here - actually I did get it to backfire once or twice. It didn't do it all the time though. There was still some stumbling though- as if the engine was running rough at a constant RPM. But it wasn't like it had a flat-spot then suddenly picked up RPM though. It immediately increased it's speed but it was sounding rough when it was doing it. I'm going to change the accel pump level setting back to it's midpoint, but it'll still leave me with the rough acceleration.
'69 Dodge Charger R/T
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300541
09/10/12 07:46 AM
09/10/12 07:46 AM
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scratchnfotraction
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Quote:
Are the accelerator pump nozzles changable on 1405 Edelbrock carbs?
yes,so is the step up springs,needles/jets.
most 1405s I have run had the accel pump rod in the middle of the 3 holes.
they are also know to be a little lean depending on what # carb you have. older 750 has a casting flaw from factory and are poop.
1405s 600cfm are pretty good for street duty IMHO.
PM sent to you.
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Re: Edelbrock accelerator pump adjustment question
[Re: ScottSmith_Harms]
#1300545
09/10/12 11:00 PM
09/10/12 11:00 PM
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David_Trimble
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Yea I'm beginning to suspect the ignition, too. The behavior of the engine as it accellerates doesn't seem to be fuel related (the backfire and the fact that it's more of a stutter than a flat spot) I suspect that my spark plug wires might be bad (the spark plugs themselves are good, supposedly - I replaced them just last weekend) so I'm going to check them for arcing and continuity later this week. The cap is old, too- I'll check the inside for signs of arcing. Will post my findings of course....
'69 Dodge Charger R/T
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Re: Edelbrock accelerator pump adjustment question
[Re: Cab_Burge]
#1300547
09/11/12 04:08 PM
09/11/12 04:08 PM
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MY340
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Make sure you're running enough intial timing too. It can cause a stumble/hesitation that many take for a carb problem. You shouldn't be having problems with a 3 yr old carb....
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Moparless for now but when the opportunity is right I'll have another one.
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300549
09/11/12 08:05 PM
09/11/12 08:05 PM
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David_Trimble
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I pulled the distributor cap and.... well, I'm not sure what to make of this (note the bevels worn out at the bases of each wire terminal where the rotor's been striking them): I also found some fine, powered metal flakes dusted all over the inside of the cap (which by the way doesn't look like there's been any arcing): For grins I tried to line up the rotor (using the worn out spot where the rotor pivots against the coil wire contact as a guide) to see how close it was getting to the plug wire terminals, and... well it looks like a pretty big gap- about a 1/8" from the tip of the rotor going across to the face on the notch of the terminal: Any ideas? I've seen caps where the arc would jump straight across to the opposide side of the notch and I've never seen this kind of wear before on the terminals. And I'm not sure if there's supposed to be that large a gap between the rotor and the wire terminals. But I might be wrong on this of course.
'69 Dodge Charger R/T
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300550
09/11/12 08:35 PM
09/11/12 08:35 PM
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RapidRobert
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Might get a good ribbed cap also with brass terminals. NAPA offers an Echlin MO 3000 rotor with a .060" longer blade, $8.xx. Could be a stackup of tolerances and I'd remove the dist & drive out the lower roll pin and remove the plastic collar and add 1/2" ID flat washers & get your end play to .005" then add the collar & drive in the roll pin. www.speedwaymotors.com has a cheap kit or your hardware store. Might drill a rectangle or 2 in the side of your cap & mockup & check your actual clearances and I would drill a 3/8" hole in the top flat of the cap 2/3 of the way between the center terminal and #1 terminal & check rotor phasing with your timing light at idle and above idle (ported I'm assuming) vac adv will shift it CW on a BB and CCW on a SB from the no vacuum position
live every 24 hour block of time like it's your last day on earth
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Re: Edelbrock accelerator pump adjustment question
[Re: David_Trimble]
#1300552
09/11/12 09:22 PM
09/11/12 09:22 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Yes get the best grade washers you can
live every 24 hour block of time like it's your last day on earth
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Re: Edelbrock accelerator pump adjustment question
[Re: RapidRobert]
#1300553
09/15/12 05:33 PM
09/15/12 05:33 PM
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David_Trimble
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Well I got some washers, pulled the distributor and when I started to check on the play I noticed something odd.....
Holding onto the bottom of the drive shaft and checking the end play I found that it had hardly any end play at all. But when I grasped the rotor end of the shaft and wiggled it, it definately had play. But when I did this and watched the drive end of the shaft, the drive end didn't budge at all....
So I have wear somewhere inside the distributor itself. Can this be repaired or am I looking at getting a rebuilt distributor (or sending this out to be rebuilt-it's the original distributor)? I did get a dial gauge on it and measured the play - it came to about .055". Obviously enough to send the rotor into the top of the cap :/
Any Ideas?
David
P.S. It's a Chrysler distributor- and while the FSM shows a exploded diagram of the insides, the FSM doesn't say anything about disassembling/repairing the shaft/centrifugal advance assembly...
Last edited by David_Trimble; 09/15/12 05:46 PM.
'69 Dodge Charger R/T
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