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Re: Hemi stumble/sputter on starting line ???
[Re: Charlie Moore]
#1493455
08/31/13 05:24 PM
08/31/13 05:24 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
The carbs were set up for a crossram and the second set we tried came off a crossram. We just checked cam timing. Bullet says this cam should be at 109. It was installed at 110.5. It has a Cloyes Hex-adjust cam gear. So I loosened the 3 gear bolts a tried to adjust adjuster cam within the cam gear and sure enough it cracked. I guess I'm done until Tuesday when I can call Cloyes. I greatly appreciate everyone's feedback and suggestions. I'm going to Norwalk now just to watch some cars that actually run. Thanks, Charlie.
I will assume that cam is a 112 LSA and they said to
install it at 109... bummer you broke the gear but
thats better to do it now then later... if it is a
112, I would advance it a bit more than the 109...
but thats me.. it would make more low end torgue and
it would help increase the stall on the conv a little...
but being that its falling on its face right now you
dont really know what the stall is because you arent
making the torque
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Re: Hemi stumble/sputter on starting line ???
[Re: MR_P_BODY]
#1493456
08/31/13 07:25 PM
08/31/13 07:25 PM
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Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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Quote:
Quote:
I'm not 100% sure what you mean when you say spray the intake? I've heard of it, but what are you spraying it with?
Spray it with carb or brake cleaner.. it has to be
a flammable product ... but if its leaking it will
suck in the carb cleaner and you will hear the revs
come up(its burning the cleaner like fuel)
I have had good luck using an unlit propane torch. Crack the valve and wave it around the intake flanges and carb base.
If you get near a leak , the rpm's will take off.
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Re: Hemi stumble/sputter on starting line ???
[Re: tubtar]
#1493457
08/31/13 08:13 PM
08/31/13 08:13 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
I'm not 100% sure what you mean when you say spray the intake? I've heard of it, but what are you spraying it with?
Spray it with carb or brake cleaner.. it has to be
a flammable product ... but if its leaking it will
suck in the carb cleaner and you will hear the revs
come up(its burning the cleaner like fuel)
I have had good luck using an unlit propane torch. Crack the valve and wave it around the intake flanges and carb base.
If you get near a leak , the rpm's will take off.
That works fine also... like I said .. any product that
is flammable will work
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Re: Hemi stumble/sputter on starting line ???
[Re: MR_P_BODY]
#1493458
08/31/13 10:09 PM
08/31/13 10:09 PM
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Joined: Jul 2010
Posts: 3,502
SOUTH JERSEY
HEMIFRED
master
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master
Joined: Jul 2010
Posts: 3,502
SOUTH JERSEY
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A smooth way to find a vacume leak is to lay a nice bead of shaving cream across the intake's edge
home of the
Sox and Martin Hemi Duster
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Re: Hemi stumble/sputter on starting line ???
[Re: HEMIFRED]
#1493459
08/31/13 11:57 PM
08/31/13 11:57 PM
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Joined: Jul 2010
Posts: 417
reynoldsburg,ohio
poppaj
mopar
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mopar
Joined: Jul 2010
Posts: 417
reynoldsburg,ohio
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I think you are the fellow. That had the nice black 65' coronet. We talked to you about installing hoses on the vent tubes. We also enlarge the pump shot hole to help with a car that stumbles like yours is. Larger squirters might cure it as well. Also have you tried running it on the front two barrels of each carb? Might rule out a problem or find a problem with secondarys. Might try a set of mechanical secondary carbs to see if it solves the stumble. Poppaj
AA/NSS 65'Coronet "Whompin Wedge"
Pop & Son Performance 557" B-1 power
John Holt Chassis
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Re: Hemi stumble/sputter on starting line ???
[Re: OUTLAWSSAA]
#1493463
09/01/13 04:37 PM
09/01/13 04:37 PM
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Joined: Jul 2005
Posts: 1,162
s e mich
ro23car
super stock
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super stock
Joined: Jul 2005
Posts: 1,162
s e mich
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Quote:
This may or may not help, because you have already tried another set of carbs. I had the same problem and chased it for a whole season. After replacing just about everything imaginable on the car I found it at the end of the season. It turned out to be one of 2 things. Because of time restraints at a race I changed the vacume pod diaphram and spring at the same time in both carbs. I made a pass with the car and that was the last time I had the nightmare stumble. I'm leaving off a brake so there is a difference there. Good luck!
hey don how are ya?
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Re: Hemi stumble/sputter on starting line ???
[Re: poppaj]
#1493465
09/01/13 06:20 PM
09/01/13 06:20 PM
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Joined: Feb 2012
Posts: 54
Strongsville, Ohio
Charlie Moore
OP
member
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OP
member
Joined: Feb 2012
Posts: 54
Strongsville, Ohio
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Quote:
I think you are the fellow. That had the nice black 65' coronet. We talked to you about installing hoses on the vent tubes. We also enlarge the pump shot hole to help with a car that stumbles like yours is. Larger squirters might cure it as well. Also have you tried running it on the front two barrels of each carb? Might rule out a problem or find a problem with secondarys. Might try a set of mechanical secondary carbs to see if it solves the stumble. Poppaj
We tried routing the vent tubes that day and it changed nothing on our car. We have tried squirters ranging from 30's to 55's. We also held the secondaries closed to make sure they were not opening to fast. I've thought about trying a set of mech. secondary carbs but my play fund has dried up with everything I've tried over the past 3 months.
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Re: Hemi stumble/sputter on starting line ???
[Re: Dodgem]
#1493466
09/01/13 06:24 PM
09/01/13 06:24 PM
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Joined: Feb 2012
Posts: 54
Strongsville, Ohio
Charlie Moore
OP
member
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OP
member
Joined: Feb 2012
Posts: 54
Strongsville, Ohio
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Quote:
So how big is this motor and what are the cam specs?
TQ stall??
Motor is supposed to be a 514. Cam is a Bullet with actual vave lift on intake of .832 and exhaust of .780. Duration @ .050 is 283/288.
The most I can footbrake it to is 2600 rpm.
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Re: Hemi stumble/sputter on starting line ???
[Re: Charlie Moore]
#1493470
09/01/13 10:22 PM
09/01/13 10:22 PM
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Quote:
Well I had an Engine builder ask if the intake runners in the heads were black and gummy? Sure enough it's pretty black and sticky. When I told him that Bullet said the cam should be at 109 and it is at 110.5, he immediately asked about the intake runners. He said it really sounds like it's getting a lot of exhaust reversion back in the cylinder and intake manifold. That could explain why when I first start it it seems fine and revs good but after about 2 minutes or so it won't rev smoothly. We are going to advance the cam to about 105 and put it back together. I will post how it goes whether it's positive or negative. Thanks again for all the feedback
That cam definitely will like 105 way way better than 110.5 or a 6500 stall speed converter. even 104. So it was dragged down by the converter holding it out of it's power band . 
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Re: Hemi stumble/sputter on starting line ???
[Re: Quicktree]
#1493471
09/01/13 11:03 PM
09/01/13 11:03 PM
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Joined: Jul 2005
Posts: 1,162
s e mich
ro23car
super stock
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super stock
Joined: Jul 2005
Posts: 1,162
s e mich
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Quote:
borrow a couple of doulbe pumper carbs and try them.get away from the vac carbs until you figure it out
those wont work.
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Re: Hemi stumble/sputter on starting line ???
[Re: ro23car]
#1493472
09/02/13 12:24 AM
09/02/13 12:24 AM
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Joined: Jan 2013
Posts: 174
hustlin hoosier
member
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member
Joined: Jan 2013
Posts: 174
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Re: Hemi stumble/sputter on starting line ???
[Re: hustlin hoosier]
#1493473
09/02/13 08:21 AM
09/02/13 08:21 AM
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Joined: Jul 2005
Posts: 1,162
s e mich
ro23car
super stock
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super stock
Joined: Jul 2005
Posts: 1,162
s e mich
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Quote:
Why won't they work?
ok i will rephrase my reply. i know of 5 different people that tried 950hp mecanical carbs and none of them could get them to work. plus my self 4 were on cast crossrams 2 were on sheetmetal intakes.
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