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09-02-2023, 02:42 PM
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CC Member
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Join Date: Jan 2012
Location: Franklin,
TN
Cobra Make, Engine: Contemporary, 427 SO
Posts: 37
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Not Ranked
Looking for ideas\advice.
427 side oiler, Quick Fuel carb. Runs well, except when slowing for traffic, lights, etc. Throttle closed, surges starting about 2000 RPM and slower.
Never did this before engine "rebuild". Engine is still basically the same,
except new heads and carb. Can furnish more information if needed. Thanks in advance for thoughts and ideas.
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09-02-2023, 03:44 PM
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CC Member
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Join Date: May 2020
Cobra Make, Engine:
Posts: 78
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Not Ranked
Check your float levels first. Sounds like you might be sloshing fuel into the engine when braking.
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09-02-2023, 06:22 PM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,501
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Not Ranked
What S1965 said. Sounds very much like fuel surge.
__________________
Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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09-03-2023, 01:58 AM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-FIA, 66 mustang convertible, mystery Ford powered 2dr convertible
Posts: 12,627
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Not Ranked
Quote:
Originally Posted by L79v
427 side oiler, Quick Fuel carb. Runs well, except when slowing for traffic, lights, etc. Throttle closed, surges starting about 2000 RPM and slower.
Never did this before engine "rebuild". Engine is still basically the same,
except new heads and carb. Can furnish more information if needed. Thanks in advance for thoughts and ideas.
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The more details you can post, the better off we can assist you.
General specs on engine?
Carb, make, model, size?
Bill S.
__________________
Instead of being part of the problem, be part of a successful solution.
First time Cobra buyers-READ THIS
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09-03-2023, 10:56 AM
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CC Member
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Join Date: Jan 2012
Location: Franklin,
TN
Cobra Make, Engine: Contemporary, 427 SO
Posts: 37
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Not Ranked
Thank you, I will check float levels first. Contemporary Cobra, engine is 427 with 428 crank stroked to 4.125". Reed solid lifter cam, BBM heads, 11.7 compression, Mallory billet distributor. Quick Fuel carb, 830 Super Street, 830cfm, dual inlet, mechanical secondaries. Primary main jet 78 secondary 84. I have a lot of information from the original owner, and from the engine builder I used. I can probably find the answer to any questions. I appreciate your advice, Gene
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09-03-2023, 11:33 AM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-FIA, 66 mustang convertible, mystery Ford powered 2dr convertible
Posts: 12,627
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Not Ranked
Too much carb for starters, you can only tweak it so much.
Do you have access to a chassis dyno? That is going to be your best bet.
Bill S.
__________________
Instead of being part of the problem, be part of a successful solution.
First time Cobra buyers-READ THIS
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09-03-2023, 11:33 AM
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CC Member
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Join Date: Nov 2009
Location: Edmond,
Ok
Cobra Make, Engine: Classic Roadsters
Posts: 601
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Not Ranked
“Fix That Rich Running Quick Fuel.”
Thread by Wbulk on right now.
Do everything the wise dude says.
__________________
 Chaney Shores Studio
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09-04-2023, 01:28 PM
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CC Member
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Join Date: Jan 2012
Location: Franklin,
TN
Cobra Make, Engine: Contemporary, 427 SO
Posts: 37
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Not Ranked
Update. Didn't have time to do much today, but did find the secondary float level a bit high. Adjusted both secondary and primary float levels about 1/8" lower than recommended. Went for a short ride, was much better. Next will adjust idle mixture,
hopefully tomorrow. Thank you to all who responded, will further update.
Gene
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09-09-2023, 12:15 PM
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CC Member
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Join Date: Jan 2012
Location: Franklin,
TN
Cobra Make, Engine: Contemporary, 427 SO
Posts: 37
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Not Ranked
Due to weather and other things I had to do, plus electric fan switch went bad, I haven't driven the car last few days. I did check the idle mixture, and it seems good where it was.
Will take a longer drive as soon as I can, it may be ok after lowering the float levels.
Thank you all!
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