4.6 vs 5.4? You Have No Idea!
12-09-2008, 09:38 PM
#21
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Location: Oklahoma
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I have a 4.6 and love it. I have owned the truck since I was 16 and now I's 24 and I still enjoy putting my foot to the floor and hearing the roar of the 4.6 through the flowmaster. I put the engine through it's paces when I was younger, now I take it easy on her.
I never pulled much to speak of, but I sell firewood in the winter and the truck does just fine with a load of wood in there. I wish I had better brakes and stiffer suspension, but there is plenty of power to still pass on the highway.
Somebody asked me what the difference between a v6 and v8 was in these trucks. My answer was both engines have plenty of power for regular daily use. When you go to put the v8 under load it does it with ease, and the v6 has to stress and strain to keep up.
I never pulled much to speak of, but I sell firewood in the winter and the truck does just fine with a load of wood in there. I wish I had better brakes and stiffer suspension, but there is plenty of power to still pass on the highway.
Somebody asked me what the difference between a v6 and v8 was in these trucks. My answer was both engines have plenty of power for regular daily use. When you go to put the v8 under load it does it with ease, and the v6 has to stress and strain to keep up.
12-16-2008, 01:55 AM
#22
Senior Member
i love both motors
well my personal opinon anymotor will work for any situation. it just depends on what you want to use it for. i have a 97 ex-cab 4.6 with 538gears and i've white smoked 49's. also i have a 2003harley 5.4 supercharged and can deff. roast some 22" tires off haha it has 4.10gears anyways i dont everything about f-150s but i do know a great deal. ive motor fitted a 7.5 FI 460 in my 97 need to make motor mounts. you dont always have to go big but i like too. later
05-05-2017, 02:30 PM
#25
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05-12-2017, 12:29 PM
#27
Renaissance Honky
Well, since we're at it... :-D
If you take the same bore sizes, but different stroke, give them the same heads, then the only difference is piston velocity @ a certain RPM. Pistons move faster in a stroker, dig?
Give a 5.4 3v a set of 3.55 rears, (and shift at 5K rpm, like stock)
Give a 4.6 3v a set of 4.10 rears, (and shift at 6K rpm, probably need a tune?)
Then you would give them the same piston velocity at the same vehicle speed in the same gear. (near as makes no practical difference)
You'd be pretty hard-pressed to find a difference, piston velocity (therefore swept volume) would be just about right on.
Might have to rip on the 4.6 a little bit, but raising shift point isn't a hard tune.
The shorter stroke engine is less demanding on head ports, and can make more power at higher RPM (at the same piston velocity as the equivalent long-stroke engine) because it's taking a smaller air charge every cycle. The longer stroke 'sucks down' the port a little harder.
At a 70mph cruise, I'd bet the 5.4 would get slightly better mileage, almost entirely due to less power being needed to drive the valvetrain and oil pump 350-400rpm slower.
I'd still rather have the 5.4 with the 3.55 gears, it's a bit more convenient to drive torque.
If you take the same bore sizes, but different stroke, give them the same heads, then the only difference is piston velocity @ a certain RPM. Pistons move faster in a stroker, dig?
Give a 5.4 3v a set of 3.55 rears, (and shift at 5K rpm, like stock)
Give a 4.6 3v a set of 4.10 rears, (and shift at 6K rpm, probably need a tune?)
Then you would give them the same piston velocity at the same vehicle speed in the same gear. (near as makes no practical difference)
You'd be pretty hard-pressed to find a difference, piston velocity (therefore swept volume) would be just about right on.
Might have to rip on the 4.6 a little bit, but raising shift point isn't a hard tune.
The shorter stroke engine is less demanding on head ports, and can make more power at higher RPM (at the same piston velocity as the equivalent long-stroke engine) because it's taking a smaller air charge every cycle. The longer stroke 'sucks down' the port a little harder.
At a 70mph cruise, I'd bet the 5.4 would get slightly better mileage, almost entirely due to less power being needed to drive the valvetrain and oil pump 350-400rpm slower.
I'd still rather have the 5.4 with the 3.55 gears, it's a bit more convenient to drive torque.
07-14-2017, 06:46 AM
#28
Junior Member
VIN chart from the factory .Check it out for your Truck Specs
http://www.fleet.ford.ca/partsandservice/vin-guides/
http://www.fleet.ford.ca/partsandservice/vin-guides/
10-31-2019, 11:24 PM
#29
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Well, since we're at it... :-D
If you take the same bore sizes, but different stroke, give them the same heads, then the only difference is piston velocity @ a certain RPM. Pistons move faster in a stroker, dig?
Give a 5.4 3v a set of 3.55 rears, (and shift at 5K rpm, like stock)
Give a 4.6 3v a set of 4.10 rears, (and shift at 6K rpm, probably need a tune?)
Then you would give them the same piston velocity at the same vehicle speed in the same gear. (near as makes no practical difference)
You'd be pretty hard-pressed to find a difference, piston velocity (therefore swept volume) would be just about right on.
Might have to rip on the 4.6 a little bit, but raising shift point isn't a hard tune.
The shorter stroke engine is less demanding on head ports, and can make more power at higher RPM (at the same piston velocity as the equivalent long-stroke engine) because it's taking a smaller air charge every cycle. The longer stroke 'sucks down' the port a little harder.
At a 70mph cruise, I'd bet the 5.4 would get slightly better mileage, almost entirely due to less power being needed to drive the valvetrain and oil pump 350-400rpm slower.
I'd still rather have the 5.4 with the 3.55 gears, it's a bit more convenient to drive torque.
If you take the same bore sizes, but different stroke, give them the same heads, then the only difference is piston velocity @ a certain RPM. Pistons move faster in a stroker, dig?
Give a 5.4 3v a set of 3.55 rears, (and shift at 5K rpm, like stock)
Give a 4.6 3v a set of 4.10 rears, (and shift at 6K rpm, probably need a tune?)
Then you would give them the same piston velocity at the same vehicle speed in the same gear. (near as makes no practical difference)
You'd be pretty hard-pressed to find a difference, piston velocity (therefore swept volume) would be just about right on.
Might have to rip on the 4.6 a little bit, but raising shift point isn't a hard tune.
The shorter stroke engine is less demanding on head ports, and can make more power at higher RPM (at the same piston velocity as the equivalent long-stroke engine) because it's taking a smaller air charge every cycle. The longer stroke 'sucks down' the port a little harder.
At a 70mph cruise, I'd bet the 5.4 would get slightly better mileage, almost entirely due to less power being needed to drive the valvetrain and oil pump 350-400rpm slower.
I'd still rather have the 5.4 with the 3.55 gears, it's a bit more convenient to drive torque.