This is topic what do you think is wrong with my motor? in forum Tech Talk at Northern California Ford Owners  .


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Posted by five-0 (Member # 3513) on :
 
okay, this is what's happening: when I hit about 5,000 rpm my friends car stutters. I don't know why it's doing this. Here's his setup: 347, cam, performer RPM ported and polished heads 11-1 compression, victor manifold, full exhuast, gears, MSD 6AL, 75mm throttle body, 75mm mass air, 30lb. injectors, cold air, running stock distributor with holley modulator, dyno sheet also shows the same thing happening. the graph shows loss of horse power at 5,000 rpm.first gear is good all the way to red line second gear is good all the way through red line, third is where it stutters at 5,200 RPM, fourth is okay and fifth is okay. What could the problem be?
 

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Posted by MISTA EE (Member # 4594) on :
 
HAVE YOU TRIED REMOVING THE MSD FROM THE SYSTEM?
I HAD THE SAME PROBLEM WITH MY JET BOAT. ONCE I TOOK IT OUT IT WORKED FINE
 

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Posted by KRZ86GT (Member # 4273) on :
 
so your running a stroked motor Jesse?
 

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Posted by a50sn95 (Member # 527) on :
 
Fuel pump and or Pressure? Do you have a fuel pressure guage? Sounds like you are running out of fuel. Fine through the first two gears, and then lays down....Pump not keeping up?
Dennis
 

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Posted by KRZ86GT (Member # 4273) on :
 
yeah. check your fuel pressure maybe too low for what your running.
 

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Posted by five-0 (Member # 3513) on :
 
Thanks, we already found the problem.
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no KRZ86GT that's my boys car.
 

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Posted by 88DroptopGT (Member # 2535) on :
 

quote:

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Originally posted by five-0:
Thanks, we already found the problem.

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Okay, what did you narrow it down to?
 

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Posted by five-0 (Member # 3513) on :
 
My boy said his head machinist said something with the roller rockers and the high lift cam he gots. he'll be out next weekend.
 

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