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Originally Posted by itsabird
just a thought, is the coil mounted close to anything where spark jump, could be an issue?
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is the coil mounted stright up or leaning on it's side?
I had a blaster 2 on the side and my car was a dog moved it stright up and was fine. |
Originally Posted by JEFF69Z28
Originally Posted by OneBadGMC
No, you're not under carbed.
Can you make a video and upload it? What you call rough and what I call rough may be two different things. Some carbs run rough at part throttle. I know you said it was a gas motor, so it's not the typical alky roughness at part throttle. You didn't say, however, whether the motor has power valves in it, or if the power valves are plugged off. If there are no power valves, it will run rough at part throttle. If, however, you can back off the motor 2 degrees, and the 'roughness' goes away, then you may want to try closing up plug gaps to like .018 (just to try it), then up the timing. If the roughness still occurs, it's time to start changing out electronic parts until you find the culprit. It could be: 1. cap, rotor, or both. 2. Old plug wires? Have you checked the resistance in each plug wire with an ohm meter? 3. Coil going bad 4. Points in the dist? If points, have you checked the point gap? 5. 6AL box going bad. 6. Excessive plug gap 7. Bad ground... The coil should be grounded to the battery and heads (both heads) via dedicated leads. Those are all things off the top of my head that can cause 'roughness' due to ignition issues. This is assuming that there's nothing wrong with the carb. A simpler thing to try would be changing the carb out... ALSO I WANT TO THANK EVERYONE FOR THEIR TIME AND HELP.MY CAPS LOCK BUTTON IS BROKE ON MY KEYBOARD THAT IS WHY IM TYPING IN CAP'S. |
IT CLEANS UP WHEN IT LAUNCHES AT THE TRACK THEN STARTS MISSING RIGHT BEFORE I SHIFT INTO 2ND GEAR CLEANS UP AGAIN THEN MISSES RIGHT BEFORE I SHIFT INTO 3RD GEAR THEN MISSES UNTIL I LET OFF THE GAS AT THE END OF THE 1/4 MILE,I HAVE THE LOW REV SET AT 7500 AND THE HIGH REV SET AT 7500 ON THE 6AL2 BOX,I DONT USE THE LOW REV OPTION AT ALL,IM SHIFTING AT 7000 RPM,CAR RAN 10.55,56&60.
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Originally Posted by montecarlo84
is the coil mounted stright up or leaning on it's side?
I had a blaster 2 on the side and my car was a dog moved it stright up and was fine. |
you may need to swap dist. box. coil,with known good parts 1 at a time from a friend or something
or bring it to a preformance ignition place to have it checked if it checks out good you'll need to look in other places don't get stuck in one problem. valve float may sound the same. pull on all the wires tite'en up lose stuff. try shiffing at 6800 or 6500 to see if it runs through |
I didn't read every post but are the valve springs good?
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Originally Posted by Tod74
I didn't read every post but are the valve springs good?
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Originally Posted by Tod74
I didn't read every post but are the valve springs good?
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New doesn't matter too much if they are the wrong springs. What exact spring brand/part number is in it?
If the springs wind up being correct, then as said before, you're gonna have to either take it somewhere to be checked, or start swapping out parts one at a time until you find the culprit. |
What brand spark plug(s) and what's heat range?
Cp |
Originally Posted by OneBadGMC
New doesn't matter too much if they are the wrong springs. What exact spring brand/part number is in it?
If the springs wind up being correct, then as said before, you're gonna have to either take it somewhere to be checked, or start swapping out parts one at a time until you find the culprit. |
You could have a spring broken. Mine did what you say yours is doing and it had less than 30 passes on some Manley springs I pulled the stud girdle and found one spring had the inner spring broken. Impossible to see without really looking. Just a thought.
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Any strange noises while the engine is at idle?
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Originally Posted by ashbros
Any strange noises while the engine is at idle?
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Originally Posted by Tod74
You could have a spring broken. Mine did what you say yours is doing and it had less than 30 passes on some Manley springs I pulled the stud girdle and found one spring had the inner spring broken. Impossible to see without really looking. Just a thought.
AS OF NOW IM INSTALLING MY OLD 6AL BOX AND MAKING SURE THE MAG PICKUP WIRES ARE AWAY FROM OTHER WIRES THAT CARRIES 12 VOLTS.LUCKLY I HAVE SOME FRIENDS WITH THE STUFF I HAVE SO I CAN SWAP OUT PARTS TO SEE IF THEY ARE BAD. |
If it's broke you will see it when the girdle is off. I was looking for electrical problems too when mine did it.I found a small chunk of metal laying in the head, that's when I took the girdle off and looked at the springs. Mine would do fine free reving and in the burnout box but would start cut out about 6500 rpm going down the track.
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Might have a broken push rod. If you are using a stock type push rod I have seen the small round ball on the top or bottom of the rod sheer off.
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Originally Posted by ashbros
Might have a broken push rod. If you are using a stock type push rod I have seen the small round ball on the top or bottom of the rod sheer off.
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Guys, lets get back to the symptoms.
He said at 34 degrees, there was no issue. At 36 degrees, a miss occurs. A broken spring, pushrod, rocker isn't going to cause a miss with a change of 2 degrees of timing. A broken part will cause an issue at all times, no matter the timing change. |
Originally Posted by OneBadGMC
Guys, lets get back to the symptoms.
He said at 34 degrees, there was no issue. At 36 degrees, a miss occurs. A broken spring, pushrod, rocker isn't going to cause a miss with a change of 2 degrees of timing. A broken part will cause an issue at all times, no matter the timing change. |
Originally Posted by JEFF69Z28
NO CRANK TRIGGER.
34* IT HAS JUST ALITTLE MISS.UNDER NO LOAD. 36* IT RUNS ROUGH FROM 3000 THRU 5000.UNDER NO LOAD. I GUESS WHAT IM ASKING IS COULD I HAVE BEEN OF A TOOTH OR SO OFF WHEN I PUT THE DIST.BACK IN AFTER I LOCKED IT OUT?I PUT IT BACK WHERE IT WAS OR I THOUGHT I DID.I WOULD LIKE TO TAKE IT OUT AND REINSTALL IT.TO DO SO WOULD I GET NUMBER 1 TO TDC(0) AND THE MOVE THE BALANCER TO 34* THEN DROP THE DIST BACK IN MAKING SURE THE ROTOR IS POINTING TO THE NUMBER ONE PISTON. |
The point being, a miss due to a broken piece of the valve train is typically going to be RPM dependent, and won't change with ignition timing.
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without looking at the car, you, are myself are just giving best guess.
the video of it running you ask for would help. I'm thinking a crank trigger would solve the problem ,but that is me.JMO |
Originally Posted by montecarlo84
without looking at the car, you, are myself are just giving best guess.
the video of it running you ask for would help. I'm thinking a crank trigger would solve the problem ,but that is me.JMO |
SHOULD I HAVE 2 BATERRIES ONE TO START THE CAR AND ONE FOR ACESSORS,RIGHT NOW I HAVE 1 BATTERY TO DO EVERYTHING,START CAR,RUN DUAL FANS,WATERPUMP AND IGNITION AND I HAVE A 100 AMP POWERMASTER ALTERNATOR CHARGING THE BATTERY.
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Originally Posted by JEFF69Z28
SHOULD I HAVE 2 BATERRIES ONE TO START THE CAR AND ONE FOR ACESSORS,RIGHT NOW I HAVE 1 BATTERY TO DO EVERYTHING,START CAR,RUN DUAL FANS,WATERPUMP AND IGNITION AND I HAVE A 100 AMP POWERMASTER ALTERNATOR CHARGING THE BATTERY.
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TOOK OUT 6AL2 AND PUT 6AL BACK IN AND IT REVS ALOT CLEANER NOW,NEXT IM GOING TO CHECK THE ROTOR PHASE.
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went to track car had a stumble on launch started messing with jets stumble started to go away 60' went from 1.52 to 1.47 then ran out of time.one thing i didnt understand was when my 60'dropped my mph also dropped why is that?
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What did you change in the jeting to improve the 60 ft? Give some info about the carb.Bill.
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Jeff your not at tdc.....one time the piston is at the top the rotor will point at number 6 the next time the piston comes up to the top the rotor will be pointing at number1....thats because the cam turns 2 times for every turn of the crank.....
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dparker, I'm not trying to start a controversy, but the cam turns over once, for every two turns of the crank.
Where ya been, did you bring a note from your doctor? :) |
Originally Posted by wmeabates
What did you change in the jeting to improve the 60 ft? Give some info about the carb.Bill.
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Jeff,Let us know how you do with the help from Pro System.It's good to hear about someone helping with the parts they sell.Bill.
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Originally Posted by suicidebomb
dparker, I'm not trying to start a controversy, but the cam turns over once, for every two turns of the crank.
Where ya been, did you bring a note from your doctor? :) I still think the reason that the rotor is pointing at 6 when he's on TDC on the harmonic balancer, is that the piston is on the exhaust stroke and not the compression stroke....lol |
Originally Posted by dparker
Originally Posted by suicidebomb
dparker, I'm not trying to start a controversy, but the cam turns over once, for every two turns of the crank.
Where ya been, did you bring a note from your doctor? :) I still think the reason that the rotor is pointing at 6 when he's on TDC on the harmonic balancer, is that the piston is on the exhaust stroke and not the compression stroke....lol |
Originally Posted by JEFF69Z28
Originally Posted by wmeabates
What did you change in the jeting to improve the 60 ft? Give some info about the carb.Bill.
"950 HP body worked to flow 840" > Huh? 90 square sounds awefully big on the jets, I run a 1050 dominator on my 496 BBC and that's what I run. If your having an off idle stumble make sure and check your acellerator pumps, you need a good squirt as soon as you crack the throttle. That would be the first place I'd look before I started yanking jets and plugging power valvesand stuff even though I plug my power valves, just dont get ahead of yourself, you might cause another problem before you fix the original one. Trust me on this one >Do one thing at a time and put back what DOES NOT fix the problem. Be prepared when you go to the track to make several adjustments, bring plenty of tools, spare carb parts and it wouldnt hurt to have a resisdent guru handy for assistance and play with it till you get it right. Goodluck, Cp JMO>Cp |
90'S WERE TO MUCH BUT THE STUNBLE WENT AWAY SO I GUESS IT WAS MY CARB,PUT IN 88'S PLUGS WERENT TO BAD BUT CAR RAN GREAT PULLING THE FRONT WHEEL'S OFF THE GROUND AND LOW 10'S ALL NIGHT.MONDAY IM GOING TO CHANGE THE PLUGS AND GO DOWN A JET SIZE AND SEE WHAT HAPPENS.NOW I NEED TO FIND AWAY TO KEEP THE FRONT END DOWN.
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Cepx...
Yeah, the 950HP carbs only flow about 810 CFM from Holley... It's not commonly known, but yes, you get more factory flow from a 850 Double Pumper than a 950HP. |
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