5.4 vs 5.8l?
Tuned
Joined: Sep 2003
Posts: 311
Likes: 3
From: Arkansas
Ya'll need to get away from the whole OHC vs pushrod thing. Getting hung up on petty stuff and missing the bigger picture. As already mentioned an engine doesn't give a sailing turd how the valves are operated...OHC or CIB. Camshafts take a backseat to a much more important part of the engine: the cylinder head. The above referenced competitors' pushrod engines should serve as examples here.
Post Fiend
Joined: Jun 2004
Posts: 8,147
Likes: 1
From: Joppa, Maryland
Originally Posted by DOHCmarauder
I've averaged 2 a week.....they just keep replacing 'em. 
(oh, so far so good on my 3rd Ford transmission.....almost got 5,000 miles on this one.............how about that 6.OHOH, head bolts and turbo still in one piece???
)
(oh, so far so good on my 3rd Ford transmission.....almost got 5,000 miles on this one.............how about that 6.OHOH, head bolts and turbo still in one piece???
)(114k miles going strong original turbo, head gaksets and tranny
)
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Originally Posted by swann79
Until the 3v came out, peak torque in the 5.8 was at a lower RPM than it was for a 5.4.
Postmaster
Joined: Feb 2003
Posts: 4,074
Likes: 1
From: Las Vegas
Originally Posted by captain p4
I keep a spare turbo and set of head studs in the glovebox, for roadside repairs...
(114k miles going strong original turbo, head gaksets and tranny)
(114k miles going strong original turbo, head gaksets and tranny
)IMPOSSIBLE!!!..............I read on the internet they ALL have problems.
Postmaster
Joined: Feb 2003
Posts: 4,074
Likes: 1
From: Las Vegas
Originally Posted by LxMan1
Where does the 5.8L peak torque hit? My 01 5.4L hits it's peak of 350lb/ft@2500rpm.
You just don't understand how pushrod motors work.......like electric motors, 100% of torque is at 0 RPM!!!
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Originally Posted by DOHCmarauder
You just don't understand how pushrod motors work.......like electric motors, 100% of torque is at 0 RPM!!!
Ever seen electric torque motors? They can "run" stalled all day and all night, and not overheat, kind of neat.Ford really needs to do something about the modular 5.4, they are falling behind quite quickly. The new 09 5.7 HEMI, which is still a two-valve push rod engine (granted a pretty advanced engine, with VVT and a variable geometry intake) is making 380HP and 404 ft-lbs of torque.
True, the hemi's peak torque is around 4500RPM or so, but peak torque RPM does not really matter, its how flat the engine's torque curve is.
Think about it, if you engine makes peak torque at 2500RPM, that means above that RPM, the amount of torque you have will steadily decrease. Now if your engine has a torque peak at 4500RPM, but still holds 85% of that torque at 1200RPM, you have almost as much lowend as the other engine, but you keep up that maximum torque much longer.
Senior User
Joined: May 2006
Posts: 155
Likes: 0
From: St. James Long Island
351w
Maybe I'm going too far back but my 91 E-150 had the 5.8W in it and it was an absolute dog. Drank lots of gas and could barely get out of it's own way. It was rated at 200 HP at that time. I still respect that engine for reliability and durability as it never gave me an ounce of trouble.
My friend bought a much newer E-250 with 5.4L (255HP) and the minute I drove it I was jealous. In stock form these 2 engines shouldn't even be mentioned in the same sentence. All in all the modulars outperform the engines they replaced.
My friend bought a much newer E-250 with 5.4L (255HP) and the minute I drove it I was jealous. In stock form these 2 engines shouldn't even be mentioned in the same sentence. All in all the modulars outperform the engines they replaced.
Fleet Mechanic
Joined: Mar 2005
Posts: 1,603
Likes: 1
From: St Louis
Out of the box when the Bronco I have still had the E4OD and the 5.8 wasnt rebuild, I would say seat of my pants that it was a dog compared to my father's 04 5.4 F150 ext cab short bed but that was a new compared to an old high mileage engine. When the C-6 was rebuilt and backed up the rebuilt 5.8 with 0.030 overbore and a slightly better cam, seat of the pants went to the 5.8. Comparitively the 5.4 probably makes more power at the flywheel than the 5.8, but I would have to put the two on a Dyno to see what the actuals are when the power makes it to the ground. The C-6 isnt as good as the manual, drinks enough gas to make a Saud smile, but I would drive it anyday compared to the 5.4 with the auto. It just doesnt have the feel of 300 horse v-8, it feels alot like the 5.8. Though the 05 f150 drives alot more mannerly than the 91 bronco by far.
Darn this is an old fart of a post, sorry for the resurrect!
Darn this is an old fart of a post, sorry for the resurrect!
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Lead Driver
Joined: Nov 2008
Posts: 8,450
Likes: 70
From: South Jersey
i had a 97 f-250 heavy duty regular cab with the 5.8 and E4OD and 4.10 gears and now my new truck, my 5.8 would walk my superduty hands down. i put a k&n cold air kit, long tube headers and full exhaust with a custom burn't chip in it and it would crush my 5.4 as it stands right now. With that said they both got 12mpg and they both had 285 75r16 tires. i regret selling the 97 everyday i start my 04 and drive it. only if i knew.....
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Your F-250 weighed less then 4800 lbs. Your F-350 Super Duty weighs between 6200-7000 lbs. It is pointless trying to compare an older truck with an older engine to a newer truck interms of speed. The superduties weigh MUCH more then any truck that had the Windsor series in it.
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