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chadschaap
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Apr 7, 2010, 4:14 PM
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94 f150 questions advice
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hi again folks
i have a 94 f150 with 5.0 e40d 4x4 the motor has been rebuilt 1000 or so miles ago it has been bored .030 over and has a ford racing e303 cam specs are .282 at 0 lift and 220 @ .050 lift and i belive its .468 lift anyways the motor runs good just seems to not perform very well the timing is at 10 btdc it has high flow exhaust and stock fuel system it seems its get up and go got up and went the reason i say this is my 89 f250 with stock 351 that you guys helped me with recently will walk all over the 94 can anyone give me some ideas?? also does a 94 ford f150 have a rev limit in the computer??
thank you all again
chad
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Tom Greenleaf
Ultimate Carjunky
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Apr 7, 2010, 5:41 PM
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Re: 94 f150 questions advice
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I don't know of a rev limiter that you would notice if any. It might just be rear differentials gear ratio that you notice most??
T
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chadschaap
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Apr 7, 2010, 5:46 PM
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Re: 94 f150 questions advice
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the reason i was asking about a rev limiter is because at high rpms the motor starts sounding like it hit a limiter could this be a "running out of fuel problem do to the .030 over pistons??
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chadschaap
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Apr 7, 2010, 5:47 PM
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Re: 94 f150 questions advice
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also both trucks have the 3:55 gears just the 89 has a 5 speed manual in it
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Tom Greenleaf
Ultimate Carjunky
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Apr 7, 2010, 5:55 PM
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Re: 94 f150 questions advice
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Good question. I would think fuel pump could keep up and if there was a volume/pressure issue it would be noticed at heavy load on engine more than RPMs.
If you really feel it's like starving for fuel then I guess you'd have to rig up a pressure tester so you could see it fall below specs when this happens??
T
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Loren Champlain Sr
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Apr 7, 2010, 6:02 PM
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Re: 94 f150 questions advice
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Chad; Take a manifold vacuum reading at idle and another at 2500 rpm and report back.
Loren
SW Washington
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Sidom
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Apr 7, 2010, 7:56 PM
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Re: 94 f150 questions advice
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I'm probably not the best person to answer this question but that's never stopped me before.....soooooooooo no sense breakin tradition now........
I see where you've down a bunch of work to the motor but looks like you are still running factory fuel strategies on the fuel system (unless I missed something in your post). To get the performance to match the work you've done you're probably going to need to get a custom chip for the PCM.
This would be the same as doing all the work you've done and then throwing the ole 2 barrel back on it...........
I'm assuming you don't have to go thru smog where you live....cuz if you get it running the way you want....... you won't be going thru smog...
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chadschaap
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Apr 8, 2010, 4:57 AM
Post #8 of 10
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Re: 94 f150 questions advice
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thanks tom i will see if i can set a fuel pressure reading for you
i will get a vac. reading today on it loran.
sidom the box that the cam came in said that it MAY require a chip i was just trying to narrow down other options before i drop a boat load of money on a custom chip but what about bigger injectors like say from a 460 or similar. do they run the same fuel pressures? are the injectors bigger? if the pressure is the same how does a 460 get more fuel?
thanks
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re-tired
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Apr 8, 2010, 8:08 AM
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Re: 94 f150 questions advice
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With the modified cam you may need to check valve pushrod length. A hair to long or short will affect performance
LIFE'S SHORT GO FISH
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chadschaap
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Apr 8, 2010, 1:55 PM
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Re: 94 f150 questions advice
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okay i did not get a vac reading on the motor today sorry i got busy however i did run the truck fairly hard today to the polint of the motor making the sound of what i thought was a rev limiter well when i hit that point i uesd to let off today i kept my foot in it and it jercked a few times and then felt like the motor just quit till i let off the pedal then it came right back unsure what the rpms were i dont have a tac but they were way above travel speed if i had to guess somewhere around 3500 to 4000 so would i be corect in maybe assuming this thing doesnt get enough fuel at high rpms i think i had a gm product that did simalir things one time and as far as the push rods the whole thing was a kit cam and all
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