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Old 10-12-2010, 11:24 PM   #1 (permalink)
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Why are there two different I-6 motors listed

for the f-series trucks? I was looking at some info on the 1991 f-150 and it listed 150HP and 145 HP under engines.....anybody know why? Is one for towing? Maybe more torque?

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Old 10-12-2010, 11:41 PM   #2 (permalink)
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what are you looking at
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Old 10-13-2010, 12:13 AM   #3 (permalink)
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If you're looking at the EPA's fuel economy database, e.g. at fueleconomy.gov, it's because two different variations on that engine were offered. Different torque bands or emissions specs are good guesses.
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Old 10-13-2010, 01:40 AM   #4 (permalink)
eco....something or other
 
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KBB.....

how do you know which is which by looking at them? My brother thinks he has the 145 and I think I have the 150 but not sure. His revs WAAY quicker but doesn't have the torque mine does.
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Old 10-13-2010, 09:59 AM   #5 (permalink)
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Both are wrong as there were three different 4.9 I6 motors.

4.9 L I6 1987–91 165 hp (123 kW) 275 lbft (373 Nm) EFI
4.9 L I6 1992–93 145 hp (108 kW) 265 lbft (359 Nm)
4.9 L I6 1994–96 150 hp (110 kW) 260 lbft (350 Nm)

Being a 1991 you should have the 165hp unless the truck was one of the last off the line and they used the 92 motor.

Try https://www.fleet.ford.com/maintenan...ls/default.asp and see if it will give you the engine details.
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Old 10-13-2010, 12:17 PM   #6 (permalink)
eco....something or other
 
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manufacture date is 3/91, so it seems I got the "big" one....that might explain the different behaviors of the two motors. Almost like a gas vs diesel. His is very snappy and quick and mine feels heavier but is not lacking in the torque dept. It can get moving in a hurry if I am willing to sacrifice some fuel.
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Old 10-13-2010, 12:25 PM   #7 (permalink)
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What about just the regular old california vs US version?

I know lots of things are made 49 state legal, and then they have some extra cats/emissions equipment for the ones sold in Cali.
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Old 10-13-2010, 03:22 PM   #8 (permalink)
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If it "feels" like that much difference, his probably has higher ratio axle(s).
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Old 10-13-2010, 04:13 PM   #9 (permalink)
eco....something or other
 
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He is running a 2.65? and I am running a 3.55.
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Old 10-13-2010, 04:39 PM   #10 (permalink)
eco....something or other
 
Join Date: Jul 2009
Location: Colfax, WI
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wood hauler - '91 Ford F-250
Team Pontiac
90 day: 18.97 mpg (US)

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Thanks: 38
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I just noticed on the door are the remains of a large decal that had "construction" in it. Looks like they tried to sand it off? That would explain why the engine runs so good. I don't know why I never noticed it before. The ford FLEET lookup does not match the label in the truck. The FLEET lookup says it has a GVWR of 10,000 lbs and the door says 6600. The wheel bases are also different. Should I go by what Ford says or the sticker? I know this thing will pull anything and will carry a full cord of wood with no problem.

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