06-03-2008, 02:55 PM
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Beam Me Up Scottie
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Join Date: Aug 2004
Location: Squantum (part of Quincy),
MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
Posts: 7,592
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Not Ranked
Quote:
Originally Posted by MrMagoo
The pressure seems to be staying steady at 6.5. The engine is just up to normal operating temperature when it honks out. Although I think, in general, my fuel temperature issues need to be addressed, I am now leaning towards jetting as the main problem. Carb tuned for max power, I have a restricted exhaust, hence too much jet for the air I can pump.
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Overly rich jetting is NOT going to make the engine quit in 5 minutes. Put in the carb spacer before doing any carb changes.
Then adjust your float levels. Check float levels again after a 5 minute drive where you open the secondaries a couple of times. I know that will be a tough job. 
Now check the condition of the plugs. It is probably time to change them. Now set the idle screws and take it for a ride. If it still smells rich, then change the jets.
When I first bought my Cobra (used), it smelled very rich. I adjusted the idle screws and the smell from the exhaust was eliminated. Then I had one dyno pull, just to see what the mixture was like. It was LEAN. I had to go up in jet sizes - 3 steps on both the primaries and secondaries. What a difference!
The 7 PSI at idle is OK. If you bought a Holley Fuel Pressure regulator, the factory setting is 7 PSI. Of course, you should also have at least 4 PSI when running flat out ... thru the 1/4 mile traps, for example.
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Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
Last edited by wtm442; 06-03-2008 at 03:08 PM..
Reason: added pressure reg info
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