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post #1 of 9 Old 08-13-2020, 10:44 AM Thread Starter
tomltp
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Wrangler laredo

what cam can i use to get more low end torque than the stock cam. i have a 1991 wrangler 4.0 tall gears and auto trans.

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post #2 of 9 Old 08-13-2020, 11:27 AM
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post #3 of 9 Old 08-14-2020, 02:20 PM
fishadventure
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The stock cam is about the highest torque you’re gonna get. A 4.0 has wicked torque! If you need more than that you stroke the 4.0 and build it right and you can have 300ftlbs.

[size=“3”]Shackles & D-rings are different things.
Cranking IS turning over
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post #4 of 9 Old 08-15-2020, 09:14 AM Thread Starter
tomltp
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thanks for the info. I know that between having 31 tires and tall gears I should put lower gears in it. I am rebuilding the engine now so I was wondering about maybe a cam to drop the torque curve down a bit. I have a 1989 wrangler and have put a 1991 H.D. 4.0 in it. I love the 4.0 engine but notice the 4.3 had a little bit better low end .
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post #5 of 9 Old 08-16-2020, 04:08 AM
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If your 4.3 has more torque, your 4.0 has a problem.

Compare your Jeep to mine. I backed off at 70 mph.


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post #6 of 9 Old 08-16-2020, 09:51 AM
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The stock cam is designed for true low end torque. There may some very mild options that can increase this torque slightly but do not expect a big gain in low end torque with a camshaft change. You can gain torque in a big way by a cam swap but it typically will be mid and high end torque that is gained and low end torque is sacrificed. It raises that power band or effective RPM range of the engine.

I did a 4.0l rebuild for my XJ years ago. I did put a slightly modified camshaft in it and was happy with it. Yes, it had more zip to it. The cams specs were slightly more duration and lift than stock. My buddy at the time also had a XJ and mine did pull harder than his. IMO it wasn't enough to justify just doing a cam swap. You do have to remove the cylinder head to swap the cam in a 4.0L. If I was rebuilding a 4.0L however I would bump the cam slightly.

I agree that the 4.0L in stock form has great low end torque.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #7 of 9 Old 08-16-2020, 12:06 PM
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Originally Posted by Boojo35 View Post
The stock cam is designed for true low end torque. There may some very mild options that can increase this torque slightly but do not expect a big gain in low end torque with a camshaft change. You can gain torque in a big way by a cam swap but it typically will be mid and high end torque that is gained and low end torque is sacrificed. It raises that power band or effective RPM range of the engine.

I did a 4.0l rebuild for my XJ years ago. I did put a slightly modified camshaft in it and was happy with it. Yes, it had more zip to it. The cams specs were slightly more duration and lift than stock. My buddy at the time also had a XJ and mine did pull harder than his. IMO it wasn't enough to justify just doing a cam swap. You do have to remove the cylinder head to swap the cam in a 4.0L. If I was rebuilding a 4.0L however I would bump the cam slightly.

I agree that the 4.0L in stock form has great low end torque.
90% plus available torque just off idle. Not going to do much better than that. Well over 200 lb ft at 1000 rpm.
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post #8 of 9 Old 08-16-2020, 02:15 PM
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https://www.compcams.com/700-r4-4l60...-68-501-5.html

Here is a cam that you may consider during a rebuild. It specs are very modest but somewhat improved over a stock camshaft. It is more of a dual profile cam and gives more duration to the exhaust side which many upgraded RV, energy or mild performance cams do because many factory vehicles were more restrictive on the exhaust side of the engine.

I fully agree with @Chrisnvegas and @fishadventure about the torque a stock 4.0L produces. It comes in very low and quick.

Give us YOUR definition of low end torque. That would be the best thing for this thread.

Say for instance you have been driving an Acura RSX Type S. Your idea of low end torque starts below about 3500 to 4 K Rpms.

What do you expect low end torque to do? Get you over a rock at a very low speed like at idle, give you good power through town?

Gearing helps torque, especially usable torque in a big way.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #9 of 9 Old 08-17-2020, 05:46 AM
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Quote:
Originally Posted by tomltp View Post
thanks for the info. I know that between having 31 tires and tall gears I should put lower gears in it. I am rebuilding the engine now so I was wondering about maybe a cam to drop the torque curve down a bit. I have a 1989 wrangler and have put a 1991 H.D. 4.0 in it. I love the 4.0 engine but notice the 4.3 had a little bit better low end .
I'm a bit late to this party but low end anything an aftermarket cams don't generally go well together. Cam swaps generally make more power because they're tuned to allow more air and fuel at high rpms.

I suspect what you actually want is mid range 2500-4000 rpm horsepower and torque. That's where the 4.3 shines over the 4.0. That said, your 4.0 with stock gears shouldn't have any trouble pushing 31" tires. My 4 cylinder engine didn't have trouble pushing 33" tires up to 55mph but then the drag of the Jeep started getting too high. I could run my 4 cylinder at 75mph on the interstate as long as the road was flat...even slight uphills were no good though and I'd often have to downshift to bring the rpms up.


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