Old turbo questions off target
Elder User
Joined: Oct 2003
Posts: 702
Likes: 0
From: kingman az
will a built 302 last in a 86 f250
i have a 86 f250 with a 300/6 with 3.55 gears but ii want more towing power.will a built 302 have the same durability in my 86 f250 im concerned about the f250 having too much weight for the 302
Elder User
Joined: Jul 2004
Posts: 700
Likes: 0
From: Fairbanks
If it is built right the 302 will have enough power to get the job done. I had one in a 72 with a 3 on the tree and 2.73 gears and had more power than it knew what to do with. My bigest prolbem was keeping the tires from spining when i did not want them to. It did a great job of towing even with my 10.5 cabover on the truck. Of course it only got 13 mpg if i kept my foot out of it and about 8 mpg if I didn't.
Elder User
Joined: Jul 2004
Posts: 911
Likes: 2
From: Northern Virginia, USA
People have said before: the 4.9 is a LOW RPM motor. It's natural power band is at half the RPM of most motors.
I'd use a smallish turbo that would start making boost at low RPM, beef up the internals and limit the revs. Oldsmobile are low-end torque motors and win lots of races; check out the engine articles on www.442.com. Build for torque, adjust your gears, and quick timeslips will follow.
That 2.3 Thunderbird turbo could work well. Say it starts making boost at 2500RPM on the 'Bird. On the 4.9 that is (2500*2.3)/4.9 = 1240RPM, right at the beginning of the 4.9's torque band. Say you run your 16psi (over double atmospheric) through a big intercooler. You might double your output across the existing power band, which would be (conservative 230lbs-ft x2) = 460lbs of torque from 1200RPM to 3500RPM, plus whatever you get from headwork, cam, etc..
With a granny-low gearbox, you could drag race <i> and </i> pull stumps.
I'd use a smallish turbo that would start making boost at low RPM, beef up the internals and limit the revs. Oldsmobile are low-end torque motors and win lots of races; check out the engine articles on www.442.com. Build for torque, adjust your gears, and quick timeslips will follow.
That 2.3 Thunderbird turbo could work well. Say it starts making boost at 2500RPM on the 'Bird. On the 4.9 that is (2500*2.3)/4.9 = 1240RPM, right at the beginning of the 4.9's torque band. Say you run your 16psi (over double atmospheric) through a big intercooler. You might double your output across the existing power band, which would be (conservative 230lbs-ft x2) = 460lbs of torque from 1200RPM to 3500RPM, plus whatever you get from headwork, cam, etc..
With a granny-low gearbox, you could drag race <i> and </i> pull stumps.
New User
Joined: Apr 2003
Posts: 21
Likes: 0
Ok I just read of this real quick, would like to turbo the truck when my dad finally gives up on her and I get it.
Getting power (torque mainly for that is what a truck is for) should be no problem out of the 300. I'm looking at around ~400ft-lbs@3500 and 400BHp@~5250 out my proposed project on my 3.8 Cougar. Includes stroked to 4.2, ***** Heads, MPII blower (10PSI), moly crank, forged rods/pistons, SPI intake and all other modifactions to sustain it, now first is driveline. Estiamated costs will be min of $10k max of $20k. Now let me make this clear I have not started yet, took me a year just to research up which parts to even consider.
IMHO, getting the same for more power (I'd say 50% more condisering inline design and displacement advantages) is not unatianable, I go and say not very hard but expensive I'd estitmate and knowledge person could see the 500Hp for around $10k (include better head, ligher pistons/rods and crank).
Getting power (torque mainly for that is what a truck is for) should be no problem out of the 300. I'm looking at around ~400ft-lbs@3500 and 400BHp@~5250 out my proposed project on my 3.8 Cougar. Includes stroked to 4.2, ***** Heads, MPII blower (10PSI), moly crank, forged rods/pistons, SPI intake and all other modifactions to sustain it, now first is driveline. Estiamated costs will be min of $10k max of $20k. Now let me make this clear I have not started yet, took me a year just to research up which parts to even consider.
IMHO, getting the same for more power (I'd say 50% more condisering inline design and displacement advantages) is not unatianable, I go and say not very hard but expensive I'd estitmate and knowledge person could see the 500Hp for around $10k (include better head, ligher pistons/rods and crank).
Senior User
Joined: Oct 2004
Posts: 162
Likes: 0
So basically your saying your turbo is too small? is it spooling really quick but maxing itself out before top end? or is it holding 13 pounds at higher revs? Also what turbo did you use? Would you recomend the turbo out of a smaller high rev motor, like a stock turbo out of a saab 9-3 or something along those lines?
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Junior User
Joined: Feb 2003
Posts: 78
Likes: 0
From: ohio
what are you asking ????
the turbo is sized for 300 cid to start boost at 2000 rpm
AND will support air flow for 420 hp at 20 # boost, if and that
is, {A BIG IF} i can get the air thru the head and manifolds !
the turbo is sized for 300 cid to start boost at 2000 rpm
AND will support air flow for 420 hp at 20 # boost, if and that
is, {A BIG IF} i can get the air thru the head and manifolds !
