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Hole in Carb: Vac leak HELP! What is this?
#2011208
02/13/16 05:44 PM
02/13/16 05:44 PM
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Joined: Jul 2005
Posts: 1,499
Slidell, LA
Plum440
OP
pro stock
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OP
pro stock
Joined: Jul 2005
Posts: 1,499
Slidell, LA
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Hey Guys! Found a source of a carb vac leak. What is this hole that is under the elec choke assembly? I put my finger over the hole and you can clearly feel the sucking and the hissing goes away. Is this supposed to be like this? Nothing in the Eddy service manual addresses this hole. Carb is an Edelbrock 750 elec choke.
Thanks!
70 Challenger, 440, 4-speed, pLuM cRaZy
71 VW Super Beetle Convertible, Lemon Yellow
A couple of Jeeps…
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: Plum440]
#2011217
02/13/16 06:05 PM
02/13/16 06:05 PM
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Joined: Jan 2003
Posts: 3,921
Richmond, Indiana
19swinger70
master
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master
Joined: Jan 2003
Posts: 3,921
Richmond, Indiana
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I think hole is where you are supposed to hide your weed.
1970 340 swinger. sublime
1967 barracuda fastback BB
55 Plymouth Project
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: Plum440]
#2011219
02/13/16 06:07 PM
02/13/16 06:07 PM
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Joined: Jul 2005
Posts: 1,499
Slidell, LA
Plum440
OP
pro stock
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OP
pro stock
Joined: Jul 2005
Posts: 1,499
Slidell, LA
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It needs to be a lot bigger than this....
70 Challenger, 440, 4-speed, pLuM cRaZy
71 VW Super Beetle Convertible, Lemon Yellow
A couple of Jeeps…
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: Plum440]
#2011230
02/13/16 06:25 PM
02/13/16 06:25 PM
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Joined: Jan 2003
Posts: 3,921
Richmond, Indiana
19swinger70
master
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master
Joined: Jan 2003
Posts: 3,921
Richmond, Indiana
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I thought the stuff the kids have today was much more powerful - so in theory you don't need that 5lb bag anymore??!
1970 340 swinger. sublime
1967 barracuda fastback BB
55 Plymouth Project
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: Plum440]
#2011275
02/13/16 07:22 PM
02/13/16 07:22 PM
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Joined: Jan 2003
Posts: 3,921
Richmond, Indiana
19swinger70
master
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master
Joined: Jan 2003
Posts: 3,921
Richmond, Indiana
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Doubt this will help - but this is a pic of the E-Brock in my Dart. I have a manual choke - but the holes are drilled for the electric.
This is the newest version of the E-Brock - I think it is a "Thunder Series" or something.....
Last edited by 19swinger70; 02/13/16 07:22 PM.
1970 340 swinger. sublime
1967 barracuda fastback BB
55 Plymouth Project
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: 383man]
#2011370
02/13/16 09:40 PM
02/13/16 09:40 PM
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Joined: Jul 2005
Posts: 1,499
Slidell, LA
Plum440
OP
pro stock
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OP
pro stock
Joined: Jul 2005
Posts: 1,499
Slidell, LA
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I take it the pic is upside down. Does that carb use a choke piston inside the choke housing ? Ron No, it's correctly oriented. I think the choke mechanism is operated via a coil in the housing. Thanks.
70 Challenger, 440, 4-speed, pLuM cRaZy
71 VW Super Beetle Convertible, Lemon Yellow
A couple of Jeeps…
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: 19swinger70]
#2011371
02/13/16 09:41 PM
02/13/16 09:41 PM
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Joined: Jul 2005
Posts: 1,499
Slidell, LA
Plum440
OP
pro stock
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OP
pro stock
Joined: Jul 2005
Posts: 1,499
Slidell, LA
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Doubt this will help - but this is a pic of the E-Brock in my Dart. I have a manual choke - but the holes are drilled for the electric.
This is the newest version of the E-Brock - I think it is a "Thunder Series" or something..... Thank you.
70 Challenger, 440, 4-speed, pLuM cRaZy
71 VW Super Beetle Convertible, Lemon Yellow
A couple of Jeeps…
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: Plum440]
#2011379
02/13/16 09:49 PM
02/13/16 09:49 PM
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Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
sgcuda
master
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master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
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I take it the pic is upside down. Does that carb use a choke piston inside the choke housing ? Ron No, it's correctly oriented. I think the choke mechanism is operated via a coil in the housing. Thanks. Won't the gas run out like that?
[image][/image]
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: Plum440]
#2011403
02/13/16 10:41 PM
02/13/16 10:41 PM
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Joined: Jul 2003
Posts: 6,342
SE PA.
QuickBpBp
master
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master
Joined: Jul 2003
Posts: 6,342
SE PA.
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I take it the pic is upside down. Ron No, it's correctly oriented. LOL...
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: Plum440]
#2011538
02/14/16 01:29 AM
02/14/16 01:29 AM
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Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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I found out it's there to help cool the electric choke. It's normal and to not plug it.  The picture is upside down.
Last edited by 62maxwgn; 02/14/16 05:09 PM.
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: sgcuda]
#2011569
02/14/16 02:19 AM
02/14/16 02:19 AM
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Joined: Feb 2004
Posts: 7,196
Harrisburg, Pa.
screamindriver
master
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master
Joined: Feb 2004
Posts: 7,196
Harrisburg, Pa.
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I take it the pic is upside down. Does that carb use a choke piston inside the choke housing ? Ron No, it's correctly oriented. I think the choke mechanism is operated via a coil in the housing. Thanks. Won't the gas run out like that? I think its a lycoming aircraft engine they have an updraft carb on the bottom of the engine...{sorry could'nt resist}
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: Plum440]
#2011599
02/14/16 04:21 AM
02/14/16 04:21 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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The pic is upside down. I was not sure but I thought that used the choke piston in that housing (not an external choke vacum pull-off) which has vacum to the choke piston in the housing since it is the choke pull-off piston and it looks like maybe a plug or something is missing from the hole. Many older carbs before they used electric assist and electric chokes had the vacum that leaked past the piston go to a threaded fitting by the choke housing and that was hooked to a tube that ran down through the exh manifold and back to the carb airhorn as it pulled fresh air from the carb airhorn down through the exh manifold where it heated the air and then it was pulled into the choke housing to heat the choke coil as the eng heated up. But this carb looks to be set up with the full electric choke and does not use the heat line like they used years ago but with the choke piston in the housing it still has vacum in the housing to the choke piston to open the choke some when started. My guess without a better look is a plug should be in the hole. Ron
Last edited by 383man; 02/14/16 04:22 AM.
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: 383man]
#2011605
02/14/16 04:34 AM
02/14/16 04:34 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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What Ron said, you gotta plug that vac leak
live every 24 hour block of time like it's your last day on earth
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: 383man]
#2011624
02/14/16 10:26 AM
02/14/16 10:26 AM
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Joined: Jul 2005
Posts: 1,499
Slidell, LA
Plum440
OP
pro stock
|
OP
pro stock
Joined: Jul 2005
Posts: 1,499
Slidell, LA
|
The pic is upside down. I was not sure but I thought that used the choke piston in that housing (not an external choke vacum pull-off) which has vacum to the choke piston in the housing since it is the choke pull-off piston and it looks like maybe a plug or something is missing from the hole. Many older carbs before they used electric assist and electric chokes had the vacum that leaked past the piston go to a threaded fitting by the choke housing and that was hooked to a tube that ran down through the exh manifold and back to the carb airhorn as it pulled fresh air from the carb airhorn down through the exh manifold where it heated the air and then it was pulled into the choke housing to heat the choke coil as the eng heated up. But this carb looks to be set up with the full electric choke and does not use the heat line like they used years ago but with the choke piston in the housing it still has vacum in the housing to the choke piston to open the choke some when started. My guess without a better look is a plug should be in the hole. Ron Thanks Ron!! Funny, on my screen the picture isn't upside down.
70 Challenger, 440, 4-speed, pLuM cRaZy
71 VW Super Beetle Convertible, Lemon Yellow
A couple of Jeeps…
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Re: Hole in Carb: Vac leak HELP! What is this?
[Re: Plum440]
#2011642
02/14/16 11:12 AM
02/14/16 11:12 AM
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Joined: Jun 2012
Posts: 1,386
Philadelphia PA
Pynzo
Drugs are bad
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Drugs are bad
Joined: Jun 2012
Posts: 1,386
Philadelphia PA
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Hey Guys! Found a source of a carb vac leak. What is this hole that is under the elec choke assembly? I put my finger over the hole and you can clearly feel the sucking and the hissing goes away. Is this supposed to be like this? Nothing in the Eddy service manual addresses this hole. Carb is an Edelbrock 750 elec choke.
Thanks!
There should be a welch plug in that hole. And a rubber o ring between the choke housing and carb body.
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