4.9L Engine Performance Questions
Thread Starter
|
New User
Joined: Apr 2003
Posts: 3
Likes: 0
4.9L Engine Performance Questions
Well guys i dont know anything at all about trucks. My dad has had a 1984 f250 truck sitting in some bushes for a few years. I asked if i fixed it could i have it and he said yes. Well i popped the hood and found out its a 4.9 litre straight 6...
How much horsepower does it have...
What speeds should i shift for redline...
How many foot pounds of torque...
Whats the maximum payload...
What does it run in the quarter mile... Its a 4 speed manual...
How many cubic inches is the engine... 300???
How much horsepower does it have...
What speeds should i shift for redline...
How many foot pounds of torque...
Whats the maximum payload...
What does it run in the quarter mile... Its a 4 speed manual...
How many cubic inches is the engine... 300???
Posting Guru
Joined: Oct 2002
Posts: 2,498
Likes: 1
From: Raleigh, NC
4.9L Engine Performance Questions
If I remember correctly the '84 300ci Inline 6 (4.9L) has 140-145 horsepower, I don't exactly remember the torque either but I think it's around 270-280 lb-ft.. I looked through the manual for my '84 and it wasn't in there.
Now, according to the book here's your shift speeds:
During acceleration
4 speed manual w/o overdrive 4x2 and 4H:
1 to 2: 10 mph
2 to 3: 15 mph
3 to 4: 25 mph
Deceleration Maximum Safe downshift speeds:
4 to 3: 55 mph
3 to 2: 30 mph
2 to 1: 0 mph (yes, zero)
Shifts with a 300 should occur around 2500-3000 rpm or less. The 300 makes its power down low, no need to wear it out revving it up.
Payload:
Look on the driver's side door rear pillar. There should be a sticker there with the info you're looking for. Subtract the weight of the truck from the amount listed to the right of the GVWR rating. That will be your payload.
The 300-6 is not a speed demon, so don't be upset when it's quarter mile is around the 20-22 second mark, however it is a very good work engine. It has a lot of low end torque and so towing shouldn't be a problem for you. When properly maintained, a 300 will last 300,000 to 400,000 miles. I hope I helped you out some, good luck.
Now, according to the book here's your shift speeds:
During acceleration
4 speed manual w/o overdrive 4x2 and 4H:
1 to 2: 10 mph
2 to 3: 15 mph
3 to 4: 25 mph
Deceleration Maximum Safe downshift speeds:
4 to 3: 55 mph
3 to 2: 30 mph
2 to 1: 0 mph (yes, zero)
Shifts with a 300 should occur around 2500-3000 rpm or less. The 300 makes its power down low, no need to wear it out revving it up.
Payload:
Look on the driver's side door rear pillar. There should be a sticker there with the info you're looking for. Subtract the weight of the truck from the amount listed to the right of the GVWR rating. That will be your payload.
The 300-6 is not a speed demon, so don't be upset when it's quarter mile is around the 20-22 second mark, however it is a very good work engine. It has a lot of low end torque and so towing shouldn't be a problem for you. When properly maintained, a 300 will last 300,000 to 400,000 miles. I hope I helped you out some, good luck.
Thread Starter
|
New User
Joined: Apr 2003
Posts: 3
Likes: 0
4.9L Engine Performance Questions
Lol 22 seconds.... I figured it would be bad but DAMN!
But if i were to race a car and the other car broke down i know i could tow it... And thats cool
By the way the problem is brake lines... All rusted through... I got them all off and will put them on tommmorow.... One thing i love is how easy it is to work on. Unlike the damn honda.
But if i were to race a car and the other car broke down i know i could tow it... And thats cool
By the way the problem is brake lines... All rusted through... I got them all off and will put them on tommmorow.... One thing i love is how easy it is to work on. Unlike the damn honda.
Posting Guru
Joined: Oct 2002
Posts: 2,498
Likes: 1
From: Raleigh, NC
4.9L Engine Performance Questions
Is it a 4x4? It would make an awesome mudder.
A race you can win if you are challenged and they tell you when and where and your rules: Select this "type" of race: hook a chain between his rear bumper and your rear bumper. Then who ever makes it across a line on their side first wins. You'll win hands down, that is, unless they have a V8.
A race you can win if you are challenged and they tell you when and where and your rules: Select this "type" of race: hook a chain between his rear bumper and your rear bumper. Then who ever makes it across a line on their side first wins. You'll win hands down, that is, unless they have a V8.
Last edited by MW95F250; Apr 19, 2003 at 05:58 PM.
Senior User
Joined: Apr 2003
Posts: 159
Likes: 1
From: nowhere town nj
4.9L Engine Performance Questions
even oif they have a big v8 you mak eyour peak torque at like 2000-2500 rpm's they need to get up to liek 4000. your gonna win. and besides its got jsut as much torque as their v8 does. its great truck work with it some. it can do a mean burnout.
Senior User
Joined: Jan 2003
Posts: 121
Likes: 0
From: Indiana
4.9L Engine Performance Questions
Now the 300 six can be a mean top end motor too. I have put a 67 300 six head on my truck. ITs got a big 9" ford in teh rear (dont know what gears) but with the talegate down it will run about 125 mph (camaro was behind me with a accurate speedometer mine dont work) with the 1 bbl carb
the head and the straight pipe are the only mods doen to it. but it will be getting a 4bbl carb and the dual exhaust and prolly 4.11 if i dont have them. Dont worry the 300 six sounded like it wanted to fall apart. Also is that 4 speed a Granny low 4. Cause if it is get ready to pull about anyone u want and some houses. I watched a man with a 300 six an f-250 and a 4 speed granny low 4x4 pull a house trailer up a good steep hill. Also on the pulling contest mw said about its quite fun...but watch out for those 460s theyre mean as the 300 six but with more top end.
Any more questions ill try to answer em the best i can. And thats it for me
kcw12
1981 F-150 300 six and 4 in teh floor project "I see that camaro wanna race" Parts needed Exhaust manifold (split) Intake for 4bbl and cam
Parts wanted 4.11 gears and a granny low 5 speed
the head and the straight pipe are the only mods doen to it. but it will be getting a 4bbl carb and the dual exhaust and prolly 4.11 if i dont have them. Dont worry the 300 six sounded like it wanted to fall apart. Also is that 4 speed a Granny low 4. Cause if it is get ready to pull about anyone u want and some houses. I watched a man with a 300 six an f-250 and a 4 speed granny low 4x4 pull a house trailer up a good steep hill. Also on the pulling contest mw said about its quite fun...but watch out for those 460s theyre mean as the 300 six but with more top end.
Any more questions ill try to answer em the best i can. And thats it for me
kcw12
1981 F-150 300 six and 4 in teh floor project "I see that camaro wanna race" Parts needed Exhaust manifold (split) Intake for 4bbl and cam
Parts wanted 4.11 gears and a granny low 5 speed
Thread Starter
|
New User
Joined: Apr 2003
Posts: 3
Likes: 0
4.9L Engine Performance Questions
Yeah its unfortunatley rear drive only.... It has the 4 speed granny gear....
Would it be fun to mud even though its a 2 wheel drive???? Mudding would be sweet!
Would it be fun to mud even though its a 2 wheel drive???? Mudding would be sweet!
Trending Topics
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
4.9L Engine Performance Questions
It should do OK in the mud as long as you have wide tires & keep your speed up. A few hundred pounds of sandbags in the bed would probably help, too.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Senior User
Joined: Jan 2003
Posts: 121
Likes: 0
From: Indiana
4.9L Engine Performance Questions
I have 31 10.50s on my truck and it does relitivly well in the mud. now you aint ognna be able to climb a muddy hill like a 4x4 can but u can make it up it if u can keep your foot to the floor and get a run at it. And does that truck have a 9 inch rear end(to tell does it have a cover on the back of the rear end)
Posting Guru
Joined: Oct 2002
Posts: 2,498
Likes: 1
From: Raleigh, NC
4.9L Engine Performance Questions
You could make one heck of a pre-runner out of it since it is a 4x2.
Mud, snow, sand, just about anything you encounter, as long as you get a running start, you can go right through it with the 300.
Here's what I would do. Put a 3" or 4" suspension lift on, then add a 3" body lift, put some low gears in the back, put some skid plates on, a decorative rollbar in the bed with 5 KC Daylighters on it, a few engine mods, a good set of tires, and you'll be ready for some Chevy-whoopin' action.
Mud, snow, sand, just about anything you encounter, as long as you get a running start, you can go right through it with the 300.
Here's what I would do. Put a 3" or 4" suspension lift on, then add a 3" body lift, put some low gears in the back, put some skid plates on, a decorative rollbar in the bed with 5 KC Daylighters on it, a few engine mods, a good set of tires, and you'll be ready for some Chevy-whoopin' action.
Freshman User
Joined: Nov 2002
Posts: 45
Likes: 0
From: Celina USA
4.9L Engine Performance Questions
Originally posted by kcw12
I have 31 10.50s on my truck and it does relitivly well in the mud. now you aint ognna be able to climb a muddy hill like a 4x4 can but u can make it up it if u can keep your foot to the floor and get a run at it. And does that truck have a 9 inch rear end(to tell does it have a cover on the back of the rear end)
I have 31 10.50s on my truck and it does relitivly well in the mud. now you aint ognna be able to climb a muddy hill like a 4x4 can but u can make it up it if u can keep your foot to the floor and get a run at it. And does that truck have a 9 inch rear end(to tell does it have a cover on the back of the rear end)
Does the 9" have the rear cover or no rear cover?
JJ
Freshman User
Joined: Apr 2003
Posts: 31
Likes: 0
4.9L Engine Performance Questions
the nine inch will not have a rear cover, it's a nodular design which means that the "pumpkin" pulls out of it, makes for easy gear swaps. if it has a cover, i'd figure it's a dana, probably a dana 44. anyone who knows more than me please correct if i'm wrong.
Thread
Thread Starter
Forum
Replies
Last Post
brosko80
Ford Inline Six, 200, 250, 4.9L / 300
27
May 16, 2020 08:05 PM
Tepot
Ford Inline Six, 200, 250, 4.9L / 300
8
Apr 2, 2004 03:30 PM
Katmandu2
Ford Inline Six, 200, 250, 4.9L / 300
26
Aug 26, 2003 03:13 PM