what do you think???

[Doom's Day Custom]

My 96 ranger has the 4.0l v6 and i want more power from it and i put a performance air filter kit on and exhaust will be going on it soon and i was looking at the bigger throttle body and i have a machinist friend that has a full machine shop that i have full access too and i was think about boring out the throttle to like 68 mm but i want to is it worth the trouble ???? If i did do this what kind of performance would i see???

 

[scotts90ranger]

a bigger throttle body only gives more power at higher rpm, and that probably wouldn't be usable, what you loose with a larger throttle body is throttle response

someone else will have to chime in to something that does work, which will probably be porting the intake manifold or something

 

[The purple one]

All that will not give you much HP. Maybe a fraction of a sec. on the 1/4 mile if that.

 

[adsm08]

more power can be such a broad term. What exactly do you want out of it, better top end, faster accel, better towing? A manual trans computer usually has a more aggressive program than an auto will. there are also chips, those can usually help out some.

 

[Doom's Day Custom]

more power can be such a broad term. What exactly do you want out of it, better top end, faster accel, better towing? A manual trans computer usually has a more aggressive program than an auto will. there are also chips, those can usually help out some.

i have a auto trans and i was looking for more accel and mid -low power range!!!

 

[AllanD]

a bigger TB isn't going to do it.

The idea that it would is based on a false idea implanted by the
companies who make larger TB's.

If you want more acceleration the surest way to get it is to change gears.

AD

 

[Doom's Day Custom]

a bigger TB isn't going to do it.

The idea that it would is based on a false idea implanted by the
companies who make larger TB's.

If you want more acceleration the surest way to get it is to change gears.

AD

oh okay and is there anything i can do to improve power????

 

[kennykenny]

Didn't you say you had over 300K miles on that motor? If that's the case leave it be, its days are numbered as it is.

 

[Doom's Day Custom]

Didn't you say you had over 300K miles on that motor? If that's the case leave it be, its days are numbered as it is.

Yeah it does but i don't care because it will get a new motor soon so i just seeing what works!!!

 

[Will]

oh okay and is there anything i can do to improve power????

No.

You have to look at two things. The first is how much torque you are making per cubic inch compared to other engines with similar technology to your motor. I like to use the LT1 5.7 as an example. With 335ft# and 350cid, it's very similar to the pushrod 4.0s 225ft# 244cid. So there is nothing to gain in getting more squeeze out of it. The second thing is where the power would actually come from--rpms. Can you spin the pushrod 4.0 faster? They rev limited it to 4,900rpm. It's because of the valvetrain. I believe the roller lifters are too heavy for the valvesprings. Just a gut feeling. When Ford realized they were in last place for the 4.0ish sized motors, they made a drastic change to increase the rpm ability. The redesigned the heads with big, straight, round intake ports and went to an overhead camshaft. The lifters are gone, the ports are better-- and this motor can spin to 6,000+. It makes a little better torque, but no much. It's power gains are because it can breathe and spin faster.

If I were going to build a high performance 4.0, I would pull out the pushrod motor and swap in the cammer 4.0. Add 50hp with the head swap. Not bad.

 

[AllanD]

Actually the issue with spinning the 4.0OHV faster is a "Bob weight" and harmonic balance issue.

A V engine of any number of cylinders cannot be be perfectly balanced at ALL rpms

The Cologne engine family is semi-amous for the "cologne drone" the annoying harmonic
vibration the engine is subject to...

the 2.9 engine vibrated at 2900-3100rpm peaking just below 3000rpm.

the 4.0 with it's longer stroke vibrates somewhat lower

The point being that somewhere above 5300rpm a 4.0OHV is going to try REAL HARD to shake that crank right out of the block...

IF OTOH you were to build your 4.0OHV around a mid1997-up
rotating assembly (easily identified by the EIGHT crankshaft to
flywheel bolts) aka the "lightweight" rotating assembly the bottom \
end is "Safe" (harmonically) to over 6200rpm.

frankly there was no point in making the early 4.0 capable of spinning
past the mid 4000range because the engine had a power peak of 4200rpm
a redline of 4500rpm and were often rev limited to 4650rpm
(Would anyone be suprised that on a 1993-ish 4.0 that's how I check
tach calibration?)

The 4.0 engine is designed and built to produce torque way down low.
IT does it REAL well.

Trying to turn it into a revver? it's like training an Ox to run in the
Kentucky Derby.
A)It's a waste of time (even considering it)
B)It greatly annoys the Ox.

If you are unhappy with what a 4.0-OHV can deliver
don't waste time modifying it, replace it

But when you are considering replacements consider what you are going to use your truck for. and WHY you want "more" and what exactly "More" really is...


AD