Tunnel ram help
#857196
11/18/10 03:38 PM
11/18/10 03:38 PM
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Joined: Oct 2003
Posts: 996
Queens, New York
Harley
OP
super stock
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OP
super stock
Joined: Oct 2003
Posts: 996
Queens, New York
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I have a tunnel ram with 2 Holley 750 DP carbs on my 505 inch motor. I put a set of spark plugs in and took the car out and drove it all day. The car ran okay for the most part, it dose not idle very well in gear. Anyway I pulled the plugs and noticed that the front of the motor (plugs 1,2,3 & 4) are running lean and the back plugs are running rich. The carbs are set up exactly the same. When the motor is warm I turn in the mixture screws in until the motor stumbles and then I back them out ½ turn. What would cause this? Is this common? Should I just back out the mixture screws some more on the front carb and turn them in on the back? Thanks. 
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Re: Tunnel ram help
[Re: Harley]
#857197
11/18/10 04:53 PM
11/18/10 04:53 PM
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Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Need more info, is this a brand new set up or was it used. Has it been on your engine for awhile?
What I'm getting at is it sounds like the carbs may not be the same or they could be dirty, the float levels may be off, so many possibilities.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Tunnel ram help
[Re: Guitar Jones]
#857199
11/18/10 06:04 PM
11/18/10 06:04 PM
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Joined: Oct 2003
Posts: 996
Queens, New York
Harley
OP
super stock
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OP
super stock
Joined: Oct 2003
Posts: 996
Queens, New York
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Quote:
Need more info, is this a brand new set up or was it used. Has it been on your engine for awhile?
What I'm getting at is it sounds like the carbs may not be the same or they could be dirty, the float levels may be off, so many possibilities.
The carbs have been on for a while. They are 750dp list # 6109. I had water issues in the past and replaced the old gas tank. I also had to take the carbs apart and clean all the [Edited by Moparts - Family Friendly Site - Keep it clean] out of them. The float levels are fine. They sit sideways on a Weiand hi-ram intake.
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Re: Tunnel ram help
[Re: Harley]
#857204
11/18/10 06:52 PM
11/18/10 06:52 PM
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Joined: Oct 2005
Posts: 976
ontario canada
mac56
super stock
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super stock
Joined: Oct 2005
Posts: 976
ontario canada
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Quote:
What’s the best way to check for a vacuum leak?
Spray wd-40 any where you suspect a leak. The engine will pick up rpm as it is sucked in and burnt.
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Re: Tunnel ram help
[Re: Harley]
#857205
11/18/10 07:42 PM
11/18/10 07:42 PM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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The timing is locked
Mistake #1.
Where are the throttle disc vs. transition holes at idle?
PV, Y/N?
Do you have a balance tube between the front and rear float bowls?
Boffin Emeritus
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Re: Tunnel ram help
[Re: polyspheric]
#857206
11/18/10 08:04 PM
11/18/10 08:04 PM
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Joined: Oct 2004
Posts: 5,618
long island NY
Ari440
master
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master
Joined: Oct 2004
Posts: 5,618
long island NY
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I would look into the back carb ,see if its dumping fuel in or it has an issue
block the two outer air holes on the top see if the carb reacts to it
1.39 9.85 - 137 mph
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Re: Tunnel ram help
[Re: polyspheric]
#857207
11/18/10 08:48 PM
11/18/10 08:48 PM
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Joined: Oct 2003
Posts: 996
Queens, New York
Harley
OP
super stock
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OP
super stock
Joined: Oct 2003
Posts: 996
Queens, New York
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Quote:
The timing is locked
Mistake #1.
Where are the throttle disc vs. transition holes at idle?
PV, Y/N?
Do you have a balance tube between the front and rear float bowls?
The throttle blades are not close to the transfer slot. I have no p/v. Why is locked timing a mistake?
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Re: Tunnel ram help
[Re: Ari440]
#857208
11/18/10 08:52 PM
11/18/10 08:52 PM
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Joined: Oct 2003
Posts: 996
Queens, New York
Harley
OP
super stock
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OP
super stock
Joined: Oct 2003
Posts: 996
Queens, New York
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Quote:
I would look into the back carb ,see if its dumping fuel in or it has an issue
block the two outer air holes on the top see if the carb reacts to it
No it is not dumping any fuel, the floats are set correctly. And the motor dose slow down when blocking the air bleeds.
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Re: Tunnel ram help
[Re: VanishPt]
#857210
11/18/10 09:19 PM
11/18/10 09:19 PM
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Joined: Oct 2005
Posts: 976
ontario canada
mac56
super stock
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super stock
Joined: Oct 2005
Posts: 976
ontario canada
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Quote:
try switching the carbs and run them for a while . See if the problem follows the carb.
Very good idea in my opinion.
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