motor mod
CF Veteran
Joined: Jul 2009
Posts: 1,839
Likes: 7
From: West Deptford, NJ
Year: 97
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: Jul 2009
Posts: 1,839
Likes: 7
From: West Deptford, NJ
Year: 97
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: Feb 2010
Posts: 5,420
Likes: 0
From: Soddy Daisy TN
Year: 97
Model: Cherokee
Engine: 4.0L
The point is experience. I have been around literally hundreds of rigs that have been raced and wheeled that had 44s in them. Many of those rigs were pulling wheel stands off the line. There were many more running big blocks with enough horsepower to require large fuel lines to feed the carbs. I had a front 44 that I made when it was a very rare thing to have. They do have their limits, but they are not as fragile as you are saying. Of course they can be abused with the wrong gear ratio and a heavy foot on a locker or spool. Also, the early ones had very course splines which were not as strong as later ones. They went from 10 splines to 19 to 27 splines. At each point, there was an upgrade in axle strength. As said, a 10 spline in an early waggy axel can be broken fairly easily in a heavy rig. But the 27 spline is much stronger. But you can run 33s with as much hp as you want. They are not quite so tough with 35s, but certainly doable if you wheel with a little intelligence and lack of beer.
Newbie
Joined: Sep 2010
Posts: 7
Likes: 0
From: McEwen Tn.
Year: 1987
Model: Cherokee
Engine: 4.7 stroker turbo
Hey if you have the time and money ,do it . Buy don't expect to be done in a weeks time. I already have about 120 hours in mine and I'm not done yet.
If set up right you can have a reliable and powerful motor that can still get good gas mileage .
There is a 600 HP small block in a mustang that gets around 30 mpg. You must size the turbo for both engine size and the rpm range where you want the play . A small turbo will benefit you on the low end . the turbo will spool faster but play out sooner . A small turbo can actually choke down your motor at high rpm . But it can get tremendous low end torque .
A large turbo will take longer to spool but benefit you at high rpm .
You also must choose the correct cam ( made for boost ) for the rpm range you want power in. There are a lot of other things to consider. You should be carefully as to who you listen to on this subject. I have found that people either love them or despise them .
As far as gas mileage goes , think about it in terms of how much torque it takes to go your average speed. Let's say for example that it takes 100 lbs/ft to carry your rig down the road at 70 mph. Let's say that your engine doesn't hit 100 ft/lbs until 2200rpm . If geared correctly , at 2200 rpm you will be doing 70 mph. A idling motor will get better mpg than when spinning at 2200 rpm. So if you build low end torque and then gear the rear end right then you can change your mpg. This is certainly a simplified example . But with this philosophy you can maximize power and mpg.
I will try to post pics.
If set up right you can have a reliable and powerful motor that can still get good gas mileage .
There is a 600 HP small block in a mustang that gets around 30 mpg. You must size the turbo for both engine size and the rpm range where you want the play . A small turbo will benefit you on the low end . the turbo will spool faster but play out sooner . A small turbo can actually choke down your motor at high rpm . But it can get tremendous low end torque .
A large turbo will take longer to spool but benefit you at high rpm .
You also must choose the correct cam ( made for boost ) for the rpm range you want power in. There are a lot of other things to consider. You should be carefully as to who you listen to on this subject. I have found that people either love them or despise them .
As far as gas mileage goes , think about it in terms of how much torque it takes to go your average speed. Let's say for example that it takes 100 lbs/ft to carry your rig down the road at 70 mph. Let's say that your engine doesn't hit 100 ft/lbs until 2200rpm . If geared correctly , at 2200 rpm you will be doing 70 mph. A idling motor will get better mpg than when spinning at 2200 rpm. So if you build low end torque and then gear the rear end right then you can change your mpg. This is certainly a simplified example . But with this philosophy you can maximize power and mpg.
I will try to post pics.
CF Veteran
Joined: Aug 2008
Posts: 6,588
Likes: 495
From: Chico, CA
Year: 1986
Model: Cherokee
Engine: 4.3L with headers and full 3" exhaust system
I have. I was working in a 4WD shop at the time. There were lots of them
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