Engine won't pull R.P.M's - 460 Ford Forum
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Old 07-21-2013, 07:13 PM
fumotor069 fumotor069 is offline
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Angry Engine won't pull R.P.M's

I put the car away last fall running a best of 10.60's at 124 mph. I back the valves off for winter{ this is a solid cam} Did some upgrades to suspension, added motor plate,engine limiters, new headers, Sent converter back to be loosened up,sent my quick fuel E-85 carb to Horsepower Innovations to be reworked. I bring the car out after these upgrades now the car will leave good but falls on it's face.Will not pull above 5000-5500 RPM in any gear.
I have checked timing set at 34*,tried a different msd box, different coil, Disconnected tach and shift light.Did not help the problem.I have checked valve lash, has not changed. I am thinking valve springs may be weak.
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Old 07-21-2013, 10:49 PM
zephyrbob zephyrbob is offline
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while my car is a full two seconds slower than yours it does the same thing. brick wall at 5200 to 5500. a fuel test at the carb showed not enough fuel volume. to top it off running the pump with the engine off also showed insufficient tank venting....bobn
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Old 07-22-2013, 06:07 AM
fumotor069 fumotor069 is offline
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I forgot to say I flow tested fuel system with the original a1000 fuel pump,did not flow enough.The fuel pump was old so I replaced with a new a1000 that flowed better than the old one. I tried putting the 2 a1000 pumps together and the regulator would not return enough fuel.I could not get fuel pressure under 11 psi. I bought an magnafuel 500 fuel pump and regulator.
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Old 07-22-2013, 08:31 AM
butterbean butterbean is online now
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have you checked the vent on the tank? if so the only other thing I can think of is the valve springs, do you have a spring pressure tester? good luck
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Old 07-22-2013, 06:30 PM
fumotor069 fumotor069 is offline
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I checked the vent to fuel cell, was no blockage.I flow tested the fuel system with the cell cap off and on there was no flow difference, So i think that the vent is ok. I do have a valve spring tester.I will test the springs and see what happens. Thank you for all help. Larry
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Old 07-23-2013, 03:26 AM
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TRUKPULR TRUKPULR is offline
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OK the big question is what did you turn for R's last fall before you put it away.
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Old 07-23-2013, 03:45 AM
fumotor069 fumotor069 is offline
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6200 rpm
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Old 07-23-2013, 08:32 AM
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MrScharfenberger MrScharfenberger is offline
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You said you had the carb worked on. It still sounds like a fuel starvation problem to me. Just not enough gas to keep it turning as quick as you need it to. I'd check the carb out again just to make sure. Maybe take it back to the guys that did the work and let them know what is going on and have them check it out.
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