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09-01-2014, 06:45 PM
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CC Member
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Join Date: May 2014
Location: Eugene,
or
Cobra Make, Engine: Backdraft RT3 #1350 427
Posts: 34
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Not Ranked
Iconic 427 runs very rich since new?
Have 600 miles on #1350 and runs really rich (always has). Starts and idles okay at 1000 rpm to 1100 rpm and choke seems fine. Black smoke at all engine speeds. Dyno shows lack of RWHP (-100) and possible ignition issue? Any folks with this engine and Holley 670 with MSD ignition that have experienced the same. Would welcome any tuning tips you may have. Am in OR so too far from BD for checkup there.
Thanks in advance.
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09-02-2014, 05:58 AM
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CC Member/Contributor
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Join Date: Mar 2012
Posts: 445
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Not Ranked
Did the chassis dyno have an afr setup?
My car was running slightly rich and down 100rwhp do to the throttle not opening all the way, which was a result of pedal issues.
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09-02-2014, 07:04 AM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
Mike bought a 408 crate motor from Keith Craft and I installed it for him. Later he called to tell me he was getting 6.7 mpg. I set it up for him to bring it Coach's shop. Coach is our local carb guy and all his Cobras are carbureted. Coach tuned the carb by down sizing the jets by several sizes. We called Keith's shop and talked to his dyno guy.
He said they only tune for top end because they do not know what air filter, side pipes, etc that will use which effect air fuel ratio.
After the re-jetting Mike reported his mileage at 13.7. No bad for a tune up.
So if you bought a dyno'ed crater motor maybe you should look at jetting and timing.
Dwight
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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09-02-2014, 08:13 AM
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CC Member
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Join Date: Aug 2013
Location: Haslet,
TX
Cobra Make, Engine: BDR #888, Keith Craft 408
Posts: 344
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Not Ranked
Quote:
Originally Posted by RT3_1350
Have 600 miles on #1350 and runs really rich (always has). Starts and idles okay at 1000 rpm to 1100 rpm and choke seems fine. Black smoke at all engine speeds. Dyno shows lack of RWHP (-100) and possible ignition issue? Any folks with this engine and Holley 670 with MSD ignition that have experienced the same. Would welcome any tuning tips you may have. Am in OR so too far from BD for checkup there.
Thanks in advance.
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If the engine was even tuned once it was in the car it was tuned in Miami, FL. The atmospheric conditions in Eugene, OR are much different. You should bring it to a carb guy.....
Kevin..... |
09-02-2014, 08:32 AM
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CC Member
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Join Date: Aug 2012
Location: Louisville,
KY
Cobra Make, Engine: Backdraft Racing 427 SC
Posts: 49
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Not Ranked
Iconic 427
My Backdraft is # 1214 with an Iconic 427 that I purchased from Custom Cars. When the car was delivered to me (KY) it was very hard to start, would not idle or run very well at all. It turns out he engine was 15 degrees out of time. I would suggest the carb adjustment and the timing checked by an expert mechanic.
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09-02-2014, 11:40 AM
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CC Member
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Join Date: May 2014
Location: Eugene,
or
Cobra Make, Engine: Backdraft RT3 #1350 427
Posts: 34
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Not Ranked
eedeutsch,
After you got yours tuned do you happen to remember the timing @ idle (~12 degrees???) and then the total advance (~32-36 degrees??) Be good to have a good place to start.
Did the springs get changed at all in the distributor. If they are double silver (tightest) then perhaps adding a lighter spring would improve the curve for these Iconic 427 engines?
Thanks
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09-02-2014, 05:45 PM
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CC Member
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Join Date: Aug 2012
Location: Louisville,
KY
Cobra Make, Engine: Backdraft Racing 427 SC
Posts: 49
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Not Ranked
The idle was 10-12. Timing was set at 32 degrees at 3500 RPM. The engine was built by Total Engine Concepts in Riviera Beach, FL. They are very helpful.
Nothing was changed in the distributor.
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09-02-2014, 11:33 AM
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CC Member
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Join Date: May 2014
Location: Eugene,
or
Cobra Make, Engine: Backdraft RT3 #1350 427
Posts: 34
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Not Ranked
@itstock
Yes, air/fuel mixture was measured when dyno. So rich it was about off the recordable scale. The dyno was just used for a base line - 3 pulls. Will tune next weekend and then try again.
@ everyone. Thanks for your responses. Now I know it sound pretty standard to have to go through the carb and timing to get it set correctly.
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09-03-2014, 09:21 AM
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CC Member
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Join Date: May 2014
Location: Eugene,
or
Cobra Make, Engine: Backdraft RT3 #1350 427
Posts: 34
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Not Ranked
Good information...thanks!
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09-03-2014, 10:40 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-289 FIA, ERA 289 roadster hybrid, mystery Ford powered 2dr convertible
Posts: 12,763
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Not Ranked
Quote:
Originally Posted by RT3_1350
Have 600 miles on #1350 and runs really rich (always has). Starts and idles okay at 1000 rpm to 1100 rpm and choke seems fine. Black smoke at all engine speeds. Dyno shows lack of RWHP (-100) and possible ignition issue? Any folks with this engine and Holley 670 with MSD ignition that have experienced the same. Would welcome any tuning tips you may have. Am in OR so too far from BD for checkup there.
Thanks in advance.
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Get rid of the 670cfm Vac sec and go with a 600cfm DP with four corner idle adjustment for starters.
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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09-03-2014, 01:06 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Quote:
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Get rid of the 670cfm Vac sec and go with a 600cfm DP with four corner idle adjustment for starters
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670 CFm Vac secondary? That seems small for 427 cu in?
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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09-03-2014, 01:44 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,605
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Not Ranked
A 600 is going to feed a 427 up to about 3500rpm......?
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09-03-2014, 05:12 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
That sounds like a sticking choke.
__________________
Jim
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09-03-2014, 07:45 PM
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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-289 FIA, ERA 289 roadster hybrid, mystery Ford powered 2dr convertible
Posts: 12,763
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Not Ranked
Quote:
Originally Posted by CHANMADD
A 600 is going to feed a 427 up to about 3500rpm......?
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We are not talking a drag racer here.
Want to bet which will get the car to run better on the street 
__________________
Instead of being part of the problem, be part of a successful solution.
First time Cobra buyers-READ THIS
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09-03-2014, 09:19 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
How about we fix his problem and then debate carburetor size?
__________________
Jim
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09-03-2014, 10:22 PM
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CC Member
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Join Date: May 2014
Location: Eugene,
or
Cobra Make, Engine: Backdraft RT3 #1350 427
Posts: 34
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Not Ranked
One problem solved
Decided to change out the plugs this afternoon in anticipation of a carb and timing adjustment this Saturday along with the 500 mile checkup.
Found two plugs...one on each side with virtually no gap. See photo.
Should not run so rich now. Wish I had discovered sooner.
Thanks all!
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09-04-2014, 04:49 AM
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CC Member
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Join Date: Aug 2013
Location: Haslet,
TX
Cobra Make, Engine: BDR #888, Keith Craft 408
Posts: 344
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Not Ranked
RT3 1350, who was your selling dealer? Was it Custom Cars in Miami or someone else?
Kevin....
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09-04-2014, 02:20 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Those plugs will not cause the car to run rich. It might miss, but that won't effect the fuel mixture.
You still have a fuel problem.
__________________
Jim
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09-05-2014, 04:39 AM
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CC Member
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Join Date: Aug 2013
Location: Haslet,
TX
Cobra Make, Engine: BDR #888, Keith Craft 408
Posts: 344
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Not Ranked
Quote:
Originally Posted by jhv48
Those plugs will not cause the car to run rich. It might miss, but that won't effect the fuel mixture.
You still have a fuel problem.
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But those plugs and the fact that is was running real rich from day one lends credence to the distinct possibility that the car was never tuned prior to being shipped.
Kevin..... |
09-05-2014, 12:40 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Quote:
Originally Posted by Grey 65
But those plugs and the fact that is was running real rich from day one lends credence to the distinct possibility that the car was never tuned prior to being shipped.
Kevin.....
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Absolutely! I would be hopping mad if my car was delivered like that. If it's running that rich from the beginning, it could have washed down the cylinders so the rings will never seat.
__________________
Jim
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