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Re: Velocity - Timing ???????
[Re: jamesc]
#539954
11/29/09 09:20 AM
11/29/09 09:20 AM
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if you're adding fuel (in what way?) and it's getting better what makes you think it's not a fuel related problem. tip in can be a monster if the carb is out of whack.
james I have had 3 different carbs on it from a 750 proform based carb to 1050 dom. have a 950 quickfuel on it now. have tried just about every squirter cam combo there is. now we are dealing with mine shaft conditions also. I notice when air is worse it does seem better.  I tried the quickfuel as set up first. this set up works fine on a few other cars I know with a stroker combo.
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Re: Velocity - Timing ???????
[Re: dizuster]
#539957
11/29/09 11:01 AM
11/29/09 11:01 AM
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Are you talking about when you stand on it it stumbles, or just tipping into it driving around?
Does it have a decent loose converter in it?
The only other thing that might be causing it is timing? Is the timing locked out in the distributor?
yes when you go from idle to wot. just driving around you can't really detect it.
has a 8" 5200 but not sure if I am getting that. it may need to looser.
timing is not locked out and could be the culprit.
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Re: Velocity - Timing ???????
[Re: Quicktree]
#539958
11/29/09 11:06 AM
11/29/09 11:06 AM
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Joined: Jun 2003
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Charleston
sixpackgut
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are you running a carb spacer on that intake with the 4150 carbs?
Gen 3 power 6.22@110, 9.85@135
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performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Velocity - Timing ???????
[Re: sixpackgut]
#539959
11/29/09 11:07 AM
11/29/09 11:07 AM
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are you running a carb spacer on that intake with the 4150 carbs?
a 1" 4 hole have tried a 1" open
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Re: Velocity - Timing ???????
[Re: dizuster]
#539962
11/29/09 11:17 AM
11/29/09 11:17 AM
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The converter is plenty loose enough for this problem, I was thinking if it was REALLY tight. I thought you were talking about "tip in" like for drivability just crusing around.
Why the heck are you trying to go from idle to WOT with a combo like this anyway?!
At idle RPM, when you slam the throttle blades open it's got no air speed at all, which means no fuel, which means bog. It's gonna need A LOT of squirter to cover that big of a hole...
yea I would say so  50cc pumps with 50 squirters is not enough it's a footbrake car. and sometimes you can't use a 2 step thats why you need a good transistion.
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Re: Velocity - Timing ???????
[Re: dodgeboy11]
#539966
11/29/09 03:58 PM
11/29/09 03:58 PM
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What's your total timing? I agree with some others on here. Small cubic inches, big heads and intake and that's causing the issues you're describing. I'd consider locking in the timing at 35 and either having a the starter switch separate from the ignition or running an ignition with a start retard.
yep thats an option, going to jack it up some more 
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Re: Velocity - Timing ???????
[Re: RyanJ]
#539969
11/29/09 04:14 PM
11/29/09 04:14 PM
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Lock the timing
I am goping to try that
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Re: Velocity - Timing ???????
[Re: Cab_Burge]
#539970
11/29/09 04:16 PM
11/29/09 04:16 PM
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What's your total timing? I agree with some others on here. Small cubic inches, big heads and intake and that's causing the issues you're describing. I'd consider locking in the timing at 35 and either having a the starter switch separate from the ignition or running an ignition with a start retard.
yep thats an option, going to jack it up some more
Do all three carbs have rear jet extensions? Does it bog anytime you open the secondary or only when foot braking it and then hitting the throttle to WOT? I have had carbs. that would bog when to rich, with to much squirter and also when to lean and to small of squirters   Keep expermenting and let us know what you find. BTW, I have never tumed a race car that was racing in weather that had more then 40 % humidity except just before and right after a thunderstorm
yes they all have extensions. it hesitates before the car moves. I think it's more of a timing issue now. they guys are saying it may need more with these heads.
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Re: Velocity - Timing ???????
[Re: Cab_Burge]
#539973
11/29/09 04:47 PM
11/29/09 04:47 PM
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I use a set of real weak springs in all of my distributors so the timing is all in by 1500 RPM of lower depending if I strectch them or not Good luck, keep looking 
mine is set up like that and I just checked it again. it's in so quick I doubt now that is the problem but I will lock it out just to be sure.
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Re: Velocity - Timing ???????
[Re: Quicktree]
#539974
11/29/09 04:48 PM
11/29/09 04:48 PM
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How about fuel sloshing out of the vent tubes into the carb on the hit?
Last edited by Cab_Burge; 11/29/09 04:49 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Velocity - Timing ???????
[Re: Quicktree]
#539975
11/29/09 04:50 PM
11/29/09 04:50 PM
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Az
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Depending on how efficient your combustion chamber is, 35 degrees may be too much lead. Try setting the total @ 30 and see if that helps. Obviously with a 5200rpm convertor you aren't on the curve anymore when you launch - right???
Fastest 300
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Re: Velocity - Timing ???????
[Re: Cab_Burge]
#539976
11/29/09 04:51 PM
11/29/09 04:51 PM
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How about fuel sloshing out of the vent tubes into the carb on the hit?
nope like I said it's doing it before the car moves an inch. it iwll do it at idle
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Re: Velocity - Timing ???????
[Re: Quicktree]
#539977
11/29/09 05:07 PM
11/29/09 05:07 PM
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Can , Nova Scotia , Cape Breto...
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I had a problem similar to yours last year. I have a 1050 Quickfuel card 4 corner idle. I was adjusting the idle with the front two barrels. The car would pause ( not bog) when I would smash it of the line. Than I adjust the idle per instructions , with all idle air screws. 1 turn with the front idle screw , 2/3 turn with the back. problem went away
New best 10.18 , 1.40 60 ft 496 Scott Brown built, street driven 3600 lbs,654 hp , 653 ft tq
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Re: Velocity - Timing ???????
[Re: caper]
#539978
11/29/09 06:15 PM
11/29/09 06:15 PM
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I had a problem similar to yours last year. I have a 1050 Quickfuel card 4 corner idle. I was adjusting the idle with the front two barrels. The car would pause ( not bog) when I would smash it of the line. Than I adjust the idle per instructions , with all idle air screws. 1 turn with the front idle screw , 2/3 turn with the back. problem went away
they were out 1 turn each from quickfuel. I turned the frons out an aditional 1/2 turn
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Re: Velocity - Timing ???????
[Re: Brian Hafliger]
#539980
11/29/09 06:27 PM
11/29/09 06:27 PM
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I had a problem similar to yours last year. I have a 1050 Quickfuel card 4 corner idle. I was adjusting the idle with the front two barrels. The car would pause ( not bog) when I would smash it of the line. Than I adjust the idle per instructions , with all idle air screws. 1 turn with the front idle screw , 2/3 turn with the back. problem went away
they were out 1 turn each from quickfuel. I turned the frons out an aditional 1/2 turn
That could be part of the problem. Most of my holley's work best (foot braking)with the idle mixture screws out 2-2 1/2 turns. This helps the transition from idle to WOT. Some builds have required 3 turns out just to get past a bog with NO load on the engine!
Did they modify the idle ports or change the idle bleeds from holley?
I am not sure Brian i'll run out and get the card. I had the other carb out 2 1/2 turns. I should have turned them out but forgot about it.
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Re: Velocity - Timing ???????
[Re: Thumperdart]
#539983
11/29/09 06:42 PM
11/29/09 06:42 PM
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You need more motor.......... Back at ya! 
no doubt 
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Re: Velocity - Timing ???????
[Re: 602heavy]
#539985
11/29/09 08:30 PM
11/29/09 08:30 PM
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Can , Nova Scotia , Cape Breto...
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With a four corner idle carb ,it is important to adjust the idle on both primary and secondary idle speed screws. Lets say the engine is idling at 800 rpm and you want it to idle at 1100 rpm. You adjust the primary up 200 rpm , the secondary up 100 rpm to get your 1100 rpm.
Idle Speed Screws
Start out by putting a small piece of plain writing paper (.003) between the throttle butterfly adjusting screws (Idle speed screws) and the stops, let the throttle close, now back off (counter clockwise) the idle screw until you can just slide the paper out, now go back in (clockwise) 1 turn on the primary and 1/2 turn on the secondary. To start with anyhow, we want the primary and secondary idle speed screws to be set 1/3 - 2/3rds. The primary end of the carb is designed for idle and light cruise so it only makes sense that we should set the carb up using mostly the primary end circuits to accomplish a good idle
New best 10.18 , 1.40 60 ft 496 Scott Brown built, street driven 3600 lbs,654 hp , 653 ft tq
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Re: Velocity - Timing ???????
[Re: Quicktree]
#539987
11/29/09 08:42 PM
11/29/09 08:42 PM
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Quote:
just pulled the car out of the trailer and fired it up. timing is setting at 20* at idle. thought that should be plenty but maybe I need to jack it up more. any thoughts?
Since you've tried 3 different carbs, like others have already mentioned, I bet it needs more initial timing........and that motor will probably want to be locked out with that much cam and all those cubes.... 
If that doesn't fix it, it obiously needs more fuel.......
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Re: Velocity - Timing ???????
[Re: S/ST 3040]
#539990
11/30/09 05:23 PM
11/30/09 05:23 PM
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Fully ported 360-1 on a 360 might just have a weak signal
at the carburetor at idle. (Lazy)
I am sure
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Re: Velocity - Timing ???????
[Re: Quicktree]
#539992
11/30/09 07:43 PM
11/30/09 07:43 PM
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Kissimmee Fl.
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for that little of a difference I would just lock it out.  no real reason not too
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake
best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
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