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post #1 of 15 (permalink) Old 05-28-2013, 10:40 PM Thread Starter
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carb guys in.

i got a 460 with a tunnel ram with 2 600 holleys that are vacuum secondaries.When i launch off the foot brake the car stumbles bad and doesnt go.no black smoke like a rich cond.but the about 100 feet out the car just takes off like a train all the way threw the traps.mph is 128 and car runs 11.80s.with a 2.033 60 foot.I allready changed the sec springs up and down the color chart with no change.still feels like a lean stumble.What should i try next?
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post #2 of 15 (permalink) Old 05-29-2013, 09:08 AM
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What size nozzle, what color pump cam and which hole is in in now....1or2?
Did the spring swap make any difference at what RPM "it came on"?
It's most likely a lean stumble as it didn't go rich.
More info on the car such as weight, gear and tranny please.

71 Comet 289/Liberty TL/11.9Xs
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post #3 of 15 (permalink) Old 05-29-2013, 08:35 PM Thread Starter
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stumble

car is a 14 to 1 476 with a glide.car weighs 3000 by its self.i didnt notice the stumble change with diff springs.has 410,s in rear.
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post #4 of 15 (permalink) Old 05-29-2013, 09:44 PM
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go bigger on the squirter nozzle, also take a piece of tubing and connect the vents and put a hole in the center of the hose on the top. the angel on launch would slosh the fuel in the boals and then the engine would suck that fuel down. old setup i had with 2 600 vacuume secondaries that was my problems ,
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post #5 of 15 (permalink) Old 05-30-2013, 08:23 PM
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Is the timing locked ? Trans brake or foot brake? Need full advance on launch & more launch rpm than a single carb , also I like double pumpers much better for a TR. My little pump gas 466 pulls low 1.30s to high 1.20s w/2 800dp carbs foot braking.

74VEGA 466 C4 6.18@110,9.77@135.66 ON PUMP GAS
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post #6 of 15 (permalink) Old 05-30-2013, 09:23 PM
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Double pumpers would go a long way to solving the stumble IMO. You've got a lot of compression, maybe a set of 750 pumpers.
Rob

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post #7 of 15 (permalink) Old 05-30-2013, 10:18 PM Thread Starter
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yup

been looking for a couple carbs.just wanted to try and make this work.gonna try and change the squirters and maybe the 1 or 2 hole on the ramp.thanks for the ideas.
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post #8 of 15 (permalink) Old 05-30-2013, 10:26 PM
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Quote:
Originally Posted by bigblockpaul View Post
i got a 460 with a tunnel ram with 2 600 holleys that are vacuum secondaries.When i launch off the foot brake the car stumbles bad and doesnt go.no black smoke like a rich cond.but the about 100 feet out the car just takes off like a train all the way threw the traps.mph is 128 and car runs 11.80s.with a 2.033 60 foot.I allready changed the sec springs up and down the color chart with no change.still feels like a lean stumble.What should i try next?
----

What should i try next?[/QUOTE]

The right converter


also check timing,fuel presser,etc


seen way too many times people blame the carb (s)

RICH
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post #9 of 15 (permalink) Old 07-03-2013, 08:15 AM Thread Starter
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update problem solved

found the low rpm stumble.Was my Moroso electric water pump.A magnet had broken inside the pump and was drawing excessive current and causing electrical interfearance woth my msd or dist.Put on new pump and she launches like its on a mission.Goin to race fri in Minn i will update with new times.
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post #10 of 15 (permalink) Old 07-03-2013, 09:44 AM
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Have you connected the vent tubes with a piece of rubber fuel line?

Your carbs go front to back but connect the vent tubes like this if you haven't already:
http://www.flickr.com/photos/13359133@N05/8498062800/
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post #11 of 15 (permalink) Old 07-07-2013, 09:56 PM Thread Starter
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same results

tried alot of things still no launch but great top end
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post #12 of 15 (permalink) Old 07-09-2013, 11:35 PM Thread Starter
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update

i give up with tunnel ram iam goin back to a single four barrel and let her buck.
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post #13 of 15 (permalink) Old 08-27-2013, 10:22 PM Thread Starter
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wasted alot of money and time

got rid of my tunnel ram and went back to a single 4.and car lost 3 tenths.I guess motor liked all that air.Stumble problem was the Converter...Boss 429 was right.wish i didnt sell that tunnel ram
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post #14 of 15 (permalink) Old 08-27-2013, 11:05 PM
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Quote:
Originally Posted by bigblockpaul View Post
got rid of my tunnel ram and went back to a single 4.and car lost 3 tenths.I guess motor liked all that air.Stumble problem was the Converter...Boss 429 was right.wish i didnt sell that tunnel ram

THANKS, It happeneds, easy to blame the carb (s).



call me, Im sure I could find you another one

RICH
CIRCLE (R) 815 712 8738
--------------------------------
815-712-8738
BUY,SELL, or TRADE B B FORD parts
Dynoed or Test ran
CLYINDER HEAD PORTING
COMPLETE ENGINES avb
From STOCK to NOT
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post #15 of 15 (permalink) Old 08-27-2013, 11:06 PM
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Quote:
Originally Posted by bigblockpaul View Post
got rid of my tunnel ram and went back to a single 4.and car lost 3 tenths.I guess motor liked all that air.Stumble problem was the Converter...Boss 429 was right.wish i didnt sell that tunnel ram

THANKS, It happeneds, easy to blame the carb (s).



call me, Im sure I could find you another one

RICH
CIRCLE (R) 815 712 8738
--------------------------------
815-712-8738
BUY,SELL, or TRADE B B FORD parts
Dynoed or Test ran
CLYINDER HEAD PORTING
COMPLETE ENGINES avb
From STOCK to NOT
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