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Discussing Problem with new motor in the 5.0 Mustangs Forum. I have a new motor that doesn't seem to be performing at its best. When ...

       

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Old December 24th, 2005, 10:20 PM   #1
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Problem with new motor


I have a new motor that doesn't seem to be performing at its best. When I gradually push on the gas the engine performs as expected. However, when I try and take off at full throttle the engine just loses all power. Can you help?
 

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Old December 25th, 2005, 12:08 AM   #2
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give us some more details.....cam size, fuel system, gearing, etc.....
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Old December 26th, 2005, 11:15 PM   #3
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I have 165cc ARP heads (61cc), 70mm throttle body, 76mm mass air kit, 24lb injectors, Edelbrock RPM II intake, 1.7 roller rockers, comp cam. What numbers do you need off the cam card?
 
Old December 26th, 2005, 11:17 PM   #4
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I forgot... I have aeromotive fuel lines and adjustable fuel regulator. The fuel pressure is set at 39psi. The fuel pump is stock.
 
Old December 27th, 2005, 12:09 AM   #5
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Originally Posted by foxforever
I have 165cc ARP heads (61cc), 70mm throttle body, 76mm mass air kit, 24lb injectors, Edelbrock RPM II intake, 1.7 roller rockers, comp cam. What numbers do you need off the cam card?
lift & duration, rpm range.
did you degree the cam or just stick it in?
when you say it "loses all power", does it buck and jerk, fall flat on it's face and then take off, or does it feel like something is holding it back?
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Old December 27th, 2005, 12:11 AM   #6
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Originally Posted by Twist 2 Go
give us some more details.....cam size, fuel system, gearing, etc.....
I replied to your question but wasn't sure how to let you know. I'm new to the forum thing.
 
Old December 27th, 2005, 10:39 PM   #7
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Make sure the MAF is clean. I had a similar problem with my stock motor, but same exact symtoms. Cleaned the MAF (the wires) and I went from a 16.9@88 to 14.4@95 (bone stock)
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Old December 27th, 2005, 11:29 PM   #8
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Timeing? Advance?
 
Old December 29th, 2005, 12:25 AM   #9
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Here are the cam specs exactly as on the card:
valve adjustment .000 .000
gross valve lift .544 .544
duration @ .006 tappet lift 276 282
valve timing open @.006 int: 28 BTDC 67 ABDC Exh: 75 BBDC 26 ATDC
Specs are for cam installed @108 intake center line
Duration @ .050 224 230
lobe lift .3210 .3210
lobe seperation 112
 
Old December 29th, 2005, 12:31 AM   #10
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The timing is set @10 degrees because that is what the tech guy told me to set it at when I installed the diablosport chip.
To be more specific about what it does at full throttle, it just feels like something is holding it back. It just boggs down and won't gain any power unless I let off the gas and slowly apply throttle.
 
Old December 29th, 2005, 08:19 AM   #11
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sounds fuel related to me. For a start, I'd ck the fuel pressure.
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Old April 23rd, 2006, 06:15 PM   #12
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Its probably your fuel pump. The stock pump only flows at 88lph and going by the mods you listed your going to need more than that. Its probably not flowing enough fuel in the high rpms.
 
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