Edelbrock carb.....
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Junior User
Joined: Sep 2000
Posts: 78
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From: Sonora
Edelbrock carb.....
Hey all! Since I put my 1405 on, my truck actually seems to have less power. When I'm cruising at low speed and hit the throttle, I don't feel that THUMP of the secondaries kickin in. As a matter of fact, there isn't any change. Does anyone know how to fix this? Do I have to change settings, springs, etc.? Thanks. Bill
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
Post Fiend
Joined: Sep 2000
Posts: 8,238
Likes: 3
From: Oregon
Edelbrock carb.....
You actually shouldn't feel the secondaries kick in, it should be a smooth transition. The "thump" you describe is a bog created by the secondaries kicking in too early and the engine then pulling through the bog. You may be experiencing a loss of power though; expermiment with different springs and jets to find out what works best. Or just get a Holley.
If your knuckles ain't bleeding you did something wrong.
'72 F-250 "Hi-Boy" 4x4, Dana 60/HD44, FE428 @ 400+ ponies , NP435 4-speed, custom suspension w lift, mud on black.
If your knuckles ain't bleeding you did something wrong.
'72 F-250 "Hi-Boy" 4x4, Dana 60/HD44, FE428 @ 400+ ponies , NP435 4-speed, custom suspension w lift, mud on black.
Elder User
Joined: Oct 1999
Posts: 917
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From: Kelseyville USA
Edelbrock carb.....
Thats true like Proelator said...My 1406 (on a 390) is that way and runs great. Iam thinking the 1405 on a 360 may be too rich >>'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down<<
Go DOWN on the jets 2 sizes....
1405 Main jet is .100 secondary jet is .095
1406 Main jet is ..098 secondary jet is .095
1405 meetering rod stock is .070 X .047
1406 meetering rod stock is .075 X .047
step up spring 1405 is >> `orange` (lets the meetering rods come up at 5" vacuumn)
same >> 1406 is `yellow` (rods come up at 4" vacuumn)
From what i remember Jets (set) cost about 7.50
rods about 9.59
If you change the jets you will NOT not need anything but a screwdriver to remove the top of the carb. No Gasket is needed and it is SIMPLE and NOT MESSY!!
<<__JOHN__Õ¿ö
FTE Club #7
Member-
http://www.cruisin-north.com/
Santa Rosa, Calif.
72 F-250
ICQ#6030753
http://www.ford-trucks.net/users/jbhf250/
https://www.ford-trucks.com/pictorial/big/1972_f250_2.html
Go DOWN on the jets 2 sizes....
1405 Main jet is .100 secondary jet is .095
1406 Main jet is ..098 secondary jet is .095
1405 meetering rod stock is .070 X .047
1406 meetering rod stock is .075 X .047
step up spring 1405 is >> `orange` (lets the meetering rods come up at 5" vacuumn)
same >> 1406 is `yellow` (rods come up at 4" vacuumn)
From what i remember Jets (set) cost about 7.50
rods about 9.59
If you change the jets you will NOT not need anything but a screwdriver to remove the top of the carb. No Gasket is needed and it is SIMPLE and NOT MESSY!!
<<__JOHN__Õ¿ö
FTE Club #7
Member-
http://www.cruisin-north.com/
Santa Rosa, Calif.
72 F-250
ICQ#6030753
http://www.ford-trucks.net/users/jbhf250/
https://www.ford-trucks.com/pictorial/big/1972_f250_2.html
Thread Starter
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Junior User
Joined: Sep 2000
Posts: 78
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From: Sonora
Edelbrock carb.....
Well, to update, I changed out the jets, springs, and metering rods like John suggested. A slight improvement if any. Of course, it will probably improve my mileage and that would be nice. When I got it all put back together however, it wanted to backfire. Sometimes through the exhaust, sometimes through the carb. So I played around with the mixture screws. That didn't do much. I moved the accelerator pump arm up a notch, then two. The second move helped quite a bit. Then I messed with the timing. That greatly improved things. But it still will stumble, then pop, then take off. After that it does have better power than before. My question is: Am I just lessening the symptoms or am I getting closer to actually fixing the problem? My timing light is busted (Last time I loan out a tool!) so I'm kinda settin it by ear. Could the timing being a little off cause my problems???? Please help me, I don't have much hair left to pull out!!:-(
P.S. It is now mostly backfiring through the exhaust, but the carb is still stumbling.
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
P.S. It is now mostly backfiring through the exhaust, but the carb is still stumbling.
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
Elder User
Joined: Oct 1999
Posts: 917
Likes: 3
From: Kelseyville USA
Edelbrock carb.....
>>My question is: Am I just lessening the symptoms or am I getting closer to actually fixing the problem? <<
i think you are on the right track. I assume you went to the smaller carb jet(size)?
I think getting the timing set right may be the key. Backfires in the exhaust and intake seems like a timing issue.
Did you Increase or decrease the accelerator pump shot?
A Vacuum gauge may help quite a lot in setting the idle screws on the carb!
__JOHN__Õ¿ö
FTE Club #7
Member-
http://www.cruisin-north.com/
Santa Rosa, Calif.
72 F-250
ICQ#6030753
http://www.ford-trucks.net/users/jbhf250/
https://www.ford-trucks.com/pictorial/big/1972_f250_2.html
i think you are on the right track. I assume you went to the smaller carb jet(size)?
I think getting the timing set right may be the key. Backfires in the exhaust and intake seems like a timing issue.
Did you Increase or decrease the accelerator pump shot?
A Vacuum gauge may help quite a lot in setting the idle screws on the carb!
__JOHN__Õ¿ö
FTE Club #7
Member-
http://www.cruisin-north.com/
Santa Rosa, Calif.
72 F-250
ICQ#6030753
http://www.ford-trucks.net/users/jbhf250/
https://www.ford-trucks.com/pictorial/big/1972_f250_2.html
Thread Starter
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Junior User
Joined: Sep 2000
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From: Sonora
Edelbrock carb.....
One more question, is this a too much fuel problem, or not enough fuel problem? To answer the question above, I moved the arm to the innermost hole. I think that gives it more fuel, but I'm not sure. thanks for all your help.
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
Elder User
Joined: Oct 1999
Posts: 917
Likes: 3
From: Kelseyville USA
Edelbrock carb.....
One more question, is this a too much fuel problem, or not enough fuel problem? To answer the question above, I moved the arm to the innermost hole. I think that gives it more fuel, but I'm not sure. thanks for all your help.
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
__JOHN__Õ¿ö
FTE Club #7
Member-
http://www.cruisin-north.com/
Santa Rosa, Calif.
72 F-250
ICQ#6030753
http://www.ford-trucks.net/users/jbhf250/
https://www.ford-trucks.com/pictorial/big/1972_f250_2.html
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Senior User
Joined: Mar 2001
Posts: 118
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Edelbrock carb.....
Did you just replace the carb and intake? or did you swap the cam, lifters, timing set too? Just a carb and intake may cause you to lose power without the cam that can handle the extra air and fuel.
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Thread Starter
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Junior User
Joined: Sep 2000
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From: Sonora
Edelbrock carb.....
[font size="1" color="#FF0000"]LAST EDITED ON 27-Sep-01 AT 11:03 PM (EST)[/font][p]Well, I found the problem. For one thing, the vaccum advance hose was on the full-time vacuum port,(don't ask),AND the timing was advanced. Once it all came together....ahhhh, now I remember why I own an FE!!!
Now, one last question. I have a flat spot right after take off, then it picks up. I imagine it's just some small adjustment. Any ideas? And thanks to all of you for your help. Bill
P.S. There is a good article about building up an FE in the Oct. issue of Mustang & Ford mag.
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
Now, one last question. I have a flat spot right after take off, then it picks up. I imagine it's just some small adjustment. Any ideas? And thanks to all of you for your help. Bill
P.S. There is a good article about building up an FE in the Oct. issue of Mustang & Ford mag.
'70 F-250 Camper Special 360/C-6, 3.73, 8 mpg uphill or down
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
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Edelbrock carb.....
Do you still have the pump set in the number 1 hole? The hole nearest the pivot?
Try setting the pump onto the middle location and then try the outer most one.
It that doesn't work reset to the middle setting and straighten the arm with less of a bend. This will further reduce the amount of fuel being shot into the engine.
A bog or it feels like the engine is laying down is too much fuel.
Josh
Try setting the pump onto the middle location and then try the outer most one.
It that doesn't work reset to the middle setting and straighten the arm with less of a bend. This will further reduce the amount of fuel being shot into the engine.
A bog or it feels like the engine is laying down is too much fuel.
Josh
Posting Guru
Joined: Jul 2001
Posts: 1,613
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From: Gainesville, FL
Edelbrock carb.....
Your discussion is like clockwork. Backfiring is not a fuel problem. It is a guaranteed timing problem. Until timing is set don't worry about fuel. A flat spot off the line is a lean accelorator pump. If you want to feel the secondaries kick you will have to lighten/drill out your secondary weights, don't do it unless your good. A lean air/fuel will stumble through accel and the motor will run hotter. A rich air/fuel will run strong and backfire out the exhaust when you let off a hard accel.It will also leave a dark brown to black color on your plugs. Adjusting your idle mixture will not do anything but adjust your idle. Set the throttle idle position based on vacuum. I think about 14 lbs. is a good guess,is it?, then adjust your mixture with the screws.Got to run.
Good Luck, Have Fun,
KingFisher
Good Luck, Have Fun,
KingFisher
New User
Joined: Sep 2001
Posts: 7
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Edelbrock carb.....
could it be a spark plug not firing?
I was going to post this and I'll add it here as I just replaced my plugs in an old 351M and the difference is great. No shaking and it used to hit 40km's fine then kinda peter out then kick in, but now it's full on throttle(can't wait til I replace the carb).
But my posting is going to be about getting a plug out as third in on drivers side won't come out and I don't want to force it. Now the engine goes full out but will hesitate for about a second(much better then it used to be) and I'm sure it has to do with that plug.
I was going to post this and I'll add it here as I just replaced my plugs in an old 351M and the difference is great. No shaking and it used to hit 40km's fine then kinda peter out then kick in, but now it's full on throttle(can't wait til I replace the carb).
But my posting is going to be about getting a plug out as third in on drivers side won't come out and I don't want to force it. Now the engine goes full out but will hesitate for about a second(much better then it used to be) and I'm sure it has to do with that plug.
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