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 4Likes
07-14-2014, 10:16 AM
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CC Member
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Join Date: Feb 2012
Location: Redondo Beach,
CA
Cobra Make, Engine: 331 SB, AFR heads
Posts: 75
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Not Ranked
Jim,
Before you start changing emulsion tubes to correct your over rich idle and main circuit transition situation, I would suggest that you make sure that the idle circuit is properly jetted since it affects the fuel/air ratio during the transition to the main circuit.
You mentioned that it appeared to run fine while it was cold but began to backfire and pop after it warmed up. If the idle circuit was jetted correctly, it would cough and spit back out of the carbs when cold and then behave normally after the engine has fully warmed up. The first thing that I would try was to incrementally decrease the size of the idle fuel jet until it idled without any hickups when hot. Having done this, I think that your rich main circuit transition situation will have improved. Once the idle circuit performs properly, then you should go to work on the main circuit and emulsion tubes.
By the way, it is a lot cheaper and easier changing idle fuel jets than emulsion tubes.
Just my 2 cents.
John
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08-07-2014, 02:35 PM
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CC Member
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Join Date: May 2008
Location: Wilmington,
DE
Cobra Make, Engine: Classic Roadster, 302, roller cam, Holley 650
Posts: 553
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Not Ranked
John,
I'm sorry I am not responding all that quickly. I was away for 2 weeks and didn't see your response. I got a 2nd set of idle jets (55) and main jets (117). More importantly I looked on Jim Inglese's site and turned my fuel pressure down to 2.7 lbs. Now my main problems are;
1. It spits back through the carbs
2. It feels very sluggish until it hits the main jets 2700 rpm and away you go.
Any thoughts?
Jim
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The one line never heard in heaven; "Gee, I wish I had spent more time in the office."
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08-08-2014, 02:18 AM
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CC Member
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Join Date: May 2006
Location: Portland,
OR
Cobra Make, Engine: ERA FIA, 1964 289->Webers
Posts: 3,689
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Not Ranked
I'm running 60-110 on a pretty mild build(small block)
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ERA FIA 2088
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08-08-2014, 06:07 AM
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CC Member
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Join Date: May 2008
Location: Wilmington,
DE
Cobra Make, Engine: Classic Roadster, 302, roller cam, Holley 650
Posts: 553
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Not Ranked
Thank you to all who have responded. I have ordered the two intermediate idle jets (60 & 65). I expect to get them next week. I will report on any progress made.
__________________
The one line never heard in heaven; "Gee, I wish I had spent more time in the office."
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08-14-2014, 09:38 AM
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CC Member
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Join Date: May 2008
Location: Wilmington,
DE
Cobra Make, Engine: Classic Roadster, 302, roller cam, Holley 650
Posts: 553
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Not Ranked
I ordered a set of .060 and .065 idle jets and put them in for an immediate difference. Jim Inglese is spot on about the fuel psi being between 2.5 lbs and 3 lbs. Really important. A little polite burping and I can live with that until I get it to my mechanic. He has webers on his Mustang and never had a problem. Thanks to all of you have contributed.
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The one line never heard in heaven; "Gee, I wish I had spent more time in the office."
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10-30-2015, 03:25 PM
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CC Member
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Join Date: May 2008
Location: Wilmington,
DE
Cobra Make, Engine: Classic Roadster, 302, roller cam, Holley 650
Posts: 553
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Not Ranked
Does anyone have a spark plug recommendation for webers on an small block?
E303 cam
48 IDA's
302/331
__________________
The one line never heard in heaven; "Gee, I wish I had spent more time in the office."
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10-30-2015, 03:43 PM
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CC Member
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Join Date: May 2006
Location: Portland,
OR
Cobra Make, Engine: ERA FIA, 1964 289->Webers
Posts: 3,689
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Not Ranked
I'd have to look at what I'm running. Don't remember now. Nothing over the top fancy or anything, I know that. You having issues?
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ERA FIA 2088
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10-30-2015, 05:14 PM
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CC Member
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Join Date: Aug 2007
Location: NE Oklahoma,
OK
Cobra Make, Engine: Fords
Posts: 544
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Not Ranked
I used Autolite 45's. They worked fine.
Z
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'65 K code Mustang
'66 Galaxie 500
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10-30-2015, 03:53 PM
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CC Member
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Join Date: May 2006
Location: Portland,
OR
Cobra Make, Engine: ERA FIA, 1964 289->Webers
Posts: 3,689
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Not Ranked
I only have experience with my setup. Carbon build up seems to indicate that maybe the carbs maybe aren't quite dialed in? Have you cleaned the plugs & checked gaps since you got everything set?
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ERA FIA 2088
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10-30-2015, 07:24 PM
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CC Member
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Join Date: Mar 2004
Cobra Make, Engine: spf 2112 *427 stroker windsor
Posts: 333
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Not Ranked
Yes good. 3 lbs min. 3.5 max
What idle rpm you running?
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10-31-2015, 05:45 AM
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CC Member
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Join Date: May 2008
Location: Wilmington,
DE
Cobra Make, Engine: Classic Roadster, 302, roller cam, Holley 650
Posts: 553
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Not Ranked
Quote:
Originally Posted by carmine
Yes good. 3 lbs min. 3.5 max
What idle rpm you running?
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Carmine,
We are running 800rpm.
__________________
The one line never heard in heaven; "Gee, I wish I had spent more time in the office."
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10-31-2015, 05:56 AM
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CC Member
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Join Date: May 2008
Location: Wilmington,
DE
Cobra Make, Engine: Classic Roadster, 302, roller cam, Holley 650
Posts: 553
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Not Ranked
13,
Please tell me more about your shut off valve vs the return line. We are running neither a return line or shut off valve. When I get to the point of engine shut down I turn off the electric fuel pump and run the engine to reduce pressure in the line.
__________________
The one line never heard in heaven; "Gee, I wish I had spent more time in the office."
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10-31-2015, 08:46 AM
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CC Member
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Join Date: Mar 2004
Cobra Make, Engine: spf 2112 *427 stroker windsor
Posts: 333
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Not Ranked
48 Ida's 800 to low.
Idle should be about 1000 rpm.
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10-30-2015, 07:31 PM
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CC Member
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Join Date: May 2006
Location: Portland,
OR
Cobra Make, Engine: ERA FIA, 1964 289->Webers
Posts: 3,689
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Not Ranked
I set mine at 2.5 & have a shut off valve instead of a return line to the tank. I was going to replace my gauge last year but, decided to take it apart to find out what made it tick. There really wasn't anything that can go wrong with the gauge unless it flat out broke. I reinstalled it & reset the pressure at that time. Dropping from 3.5 to 2.5 & having the shut off valve cured a lot of problems I was having.
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ERA FIA 2088
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10-31-2015, 08:59 AM
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CC Member
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Join Date: May 2008
Location: Wilmington,
DE
Cobra Make, Engine: Classic Roadster, 302, roller cam, Holley 650
Posts: 553
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Not Ranked
Thank you Carmine.
__________________
The one line never heard in heaven; "Gee, I wish I had spent more time in the office."
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12-03-2015, 06:03 PM
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CC Member
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Join Date: Aug 2007
Location: NE Oklahoma,
OK
Cobra Make, Engine: Fords
Posts: 544
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Not Ranked
There is nothing wrong with an 800 rpm idle, or even lower.
A well tuned Weber 48 IDA engine will pull strongly from 650 rpm with no lugging. A high idle is a bandaid & tells me the tuning is not optimal.
Z
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'65 K code Mustang
'66 Galaxie 500
Last edited by zrayr; 12-03-2015 at 06:06 PM..
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