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Re: Popping through the carb problem.
[Re: mickm]
#1401767
03/20/13 01:05 AM
03/20/13 01:05 AM
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Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
MidPenMopar
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Quote:
stu, look at it this way. if it IS the cam, then you get to decide on ahhh... how spirited you want your engine to be after this! 
Mick, I am planning to rebuild the engine at the end of this year and will probably go back to less aggressive cam profile than what is in there now. I'm more interested in driveabilty than power so i can finally start going places without worry if something major is going to snap on me 1000 miles from home.
I just got the brakes and electrial systems all dialed in now the last thing is the engine itself.
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Re: Popping through the carb problem.
[Re: MidPenMopar]
#1401768
03/20/13 01:49 AM
03/20/13 01:49 AM
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Joined: Jun 2006
Posts: 5,173
CT
GTX MATT
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CT
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Pop through the carb under a load usually indicates a lean condition to me
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: Popping through the carb problem.
[Re: ek3]
#1401771
03/20/13 09:00 AM
03/20/13 09:00 AM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Posts: 21,345
Marysville, O-H-I-O
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Quote:
pop from carb means there is ignition with the intake valve open. that would most commonly be ignition [ malfunction] at the wrong time, or, ignition is at the correct time but the intake valve is open at the wrong time. bad valve spring,bent or broken parts keeping valve open.....either way it is a timing issue
could be, but again...not always! I've experienced it twice, and neither time was it timing related. it was a bad/weak coil the first time, and a lean condition from a vacuum leak the second time. cam, timing chain, distributor timing were all fine.
**Photobucket sucks**
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Re: Popping through the carb problem.
[Re: 70Cuda383]
#1401772
03/20/13 09:59 AM
03/20/13 09:59 AM
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Joined: Aug 2004
Posts: 8,087
Elk Grove, Calif.
bigblock340power
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Joined: Aug 2004
Posts: 8,087
Elk Grove, Calif.
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Hi Stu. Lots of good advice here. But with all this advice, it seems your chasing your tail, "fixing" without a definite direction. Problem is, your car is at your house, not here. Go to where you can do these tests on the engine, with someone good at this sort of thing. I just got done going through something like this too. But I finally just went through all the tests, and found the problem, fixed it. This sounds like an older motor you've got. Take the valve covers off, pull the plugs, spine the motor. Do a look-see at the valve train. Do the comp. test, a leak down, and test the spring pressure (look for broken springs, and bent push rods). This will rule out a few things, or point you in the right direction. I know I'm just covering some of the same things others have told you, but you need to do these things! Take a look at these you tubes, just a base line for ya. Mike PS, one other thing, put that monster on a scope, see what's up with the spark. http://www.youtube.com/watch?v=M92CGjpiMs4http://www.youtube.com/watch?v=nJ7RXu4nxkc
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Re: Popping through the carb problem.
[Re: 70Cuda383]
#1401773
03/20/13 10:46 PM
03/20/13 10:46 PM
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Joined: Jun 2012
Posts: 1,902
MYRTLE BEACH SOUTH CAROLINA
ek3
top fuel
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top fuel
Joined: Jun 2012
Posts: 1,902
MYRTLE BEACH SOUTH CAROLINA
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Quote:
Quote:
pop from carb means there is ignition with the intake valve open. that would most commonly be ignition [ malfunction] at the wrong time, or, ignition is at the correct time but the intake valve is open at the wrong time. bad valve spring,bent or broken parts keeping valve open.....either way it is a timing issue
could be, but again...not always! I've experienced it twice, and neither time was it timing related. it was a bad/weak coil the first time, and a lean condition from a vacuum leak the second time. cam, timing chain, distributor timing were all fine.
any time you get combustion in the intake and out the carb, you have a timing issue.[meaning a bad coil firing at the wrong time will do it].yes it is a bad coil but it is firing at the wrong time. a backfire through the carb can not happen unless the intake valve is open.i only say this to help the thinking process of what [when] it is actually happining.
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Re: Popping through the carb problem.
[Re: Keith Black®]
#1401775
03/23/13 01:17 AM
03/23/13 01:17 AM
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Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
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Quote:
I'd say an exhaust lifter is on its way out. Engine speed / oil pressure pumps it up but it is more or less collapsed otherwise.
Let us know how you fix it ! 
Got a new coil today via Summit and we shall see what happens but i think it's a lean issue in the carb after reading all the responces on here and the MML.
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Re: Popping through the carb problem.
[Re: RapidRobert]
#1401777
03/23/13 11:43 AM
03/23/13 11:43 AM
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Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
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Quote:
Stu pleeese solve this 
Hey Robert I'm trying to do my best but due to the weather (I dont have a garage to work in) my unrelenting work schedule and now getting sick i am left with little time to work on the car when the weather is nice outside. If the new coil does not fix it, i will work on getting the car to a shop asap.
Sorry this got so out of hand i just wanted a few ideas of what to look for and i got some good advice so thank you to all who have helped out. 
Stu
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Re: Popping through the carb problem.
[Re: MidPenMopar]
#1401778
03/23/13 01:55 PM
03/23/13 01:55 PM
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Joined: Feb 2003
Posts: 381
Denver CO
bennydodge
enthusiast
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Denver CO
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sounds like the cam.. I wouldn't spend another dime on parts. Buddy of mine had the same problem last year with his 440-6 charger. The center carb sounded like a popcorn machine, turned out to be three flat lobes on the cam. Pull the valve covers and roll the engine manually to verify...or pull the intake, they're sooooooo easy on a big block.
73 Challenger 340(416),E-heads, 727, 3.23 SG
2015 Challenger R/T classic B5, wife's car
2010 Ram 3500 Crew Cab SLT dually 4X4
2016 Challenger Hellcat Redline Red A8
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Re: Popping through the carb problem.
[Re: bennydodge]
#1401780
03/23/13 02:24 PM
03/23/13 02:24 PM
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Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
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Quote:
sounds like the cam.. I wouldn't spend another dime on parts.
Buddy of mine had the same problem last year with his 440-6 charger. The center carb sounded like a popcorn machine, turned out to be three flat lobes on the cam. Pull the valve covers and roll the engine manually to verify...or pull the intake, they're sooooooo easy on a big block.
So i did some carb tuning research in my spare time and what i found out since the engine clears up fine after about 2500 RPM when it moves to a more richer circut it would apper that like a lot of others said it's a LEAN issue and not an ignition issue as i first thought.
So i guess that the next step is to try swapping another similar carb out and see if that fixes the problem. That is my plan for next week. 
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Re: Popping through the carb problem.
[Re: GODSCOUNTRY340]
#1401781
03/23/13 02:36 PM
03/23/13 02:36 PM
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Joined: Jan 2003
Posts: 3,103
Phila Pa
scatpacktom
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Phila Pa
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Quote:
A burnt valve wouldn't cause popping through the carb. You'd have a dead cylinder and/or popping out the exhaust with a burnt valve. Exhaust valves are the ones that get burnt. I've NEVER seen a burnt intake valve.
I have. Made a rhythmic popping noise out of the carb. Didn't stop me from driving home from the shore though.
All this talk about spark plugs and carbs... I would do a compression test and a leak down test right away.
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Re: Popping through the carb problem.
[Re: MidPenMopar]
#1401782
03/23/13 04:03 PM
03/23/13 04:03 PM
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Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
.... the next step is to try swapping another similar carb out and see if that fixes the problem. That is my plan for next week. [/quote
Seriously, there isn't anyone near STU that can offer up a carburetor to test for him? I'm 2 hours away and I have PLENTY of functional carbs. Let me know STU. 600? 750? 850? Thermoquads? I even have a few Carter AVS 4 barrels.
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Re: Popping through the carb problem.
[Re: Kern Dog]
#1401783
03/23/13 05:50 PM
03/23/13 05:50 PM
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Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
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Quote:
Seriously, there isn't anyone near STU that can offer up a carburetor to test for him? I'm 2 hours away and I have PLENTY of functional carbs. Let me know STU. 600? 750? 850? Thermoquads? I even have a few Carter AVS 4 barrels.
I had two nice used Edlebrock 600's that i took off over the years and of course i loaned them all to friends (for just a few days) who never gave them back. You have to see the irony there... 
No biggie i am going to work on mine first and see once i take it apart if the jets are messed up somehow. 
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Re: Popping through the carb problem.
[Re: B1arno]
#1401785
03/24/13 09:28 AM
03/24/13 09:28 AM
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Joined: Sep 2003
Posts: 3,426
weymouth,mass.
meepmeep70
master
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weymouth,mass.
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Quote:
Stu,
I've got a new 650 Thunder series we can swap on and give it a test.
i've got an 800 thunder series edelbrock Stu if your needing to test i'll send your way
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& if I was closer I'd help you for free which I never do 