Off Roading Forums banner
1 - 4 of 4 Posts

·
Registered
Joined
·
4,447 Posts
Magic HP dust, would be my suggestion.
There is no way that a 258 without major, major, high performance work is gonna compete with a healthy V8. You will be lucky to get 200 HP out of that mill, without thousands of dollars worth of upgrades and rebuilding. Almost any V8 will start at 200 HP and be easily built to 300 or more. There must have been some sickly V8's on your run, to have them all look like Sissy's, I guarentee you, he wouldnt make my 5.0 look like a sissy.
Dont take me wrong, I know that the 258, can be built into a strong engine, Ive seen Jaffers engine, in action, and it is very healthy. I also dont believe that Big V8 HP, is the end all to beat all on the trail, but the statement that a 258 made all V8 engines look like sissies, is just stupid.
The 4.0 head swap trick, on a healthy 258, along with roller rockers, performance cam, headers, high volume fuel pump, etc. would be one route, If the magic Horse Power dust doesnt work for ya.

Jeff
89 YJ
Wow, you can get a nice tan on your arms, from welding with no shirt on.
 

·
Registered
Joined
·
4,447 Posts
Hahaha, Jeepgod, I do sound like an HP monger now, dont I?
In all honesty, though, for the kind of trails I like to wheel, the 4 cylinder was all I needed.
The V8 swap, was the most work and money, I have ever put into the YJ, with the least amount of return. Sure it impressive, and everyone wants to peak under the hood. I get a lot of ooooohs and ahhhhs, but it doesnt go anywhere I couldnt go before, and on occasion, can even cause problems due to the almost uncontrolable wheel spin, if the throttle is even slightly over applied. It sure does drive nice on the street though(big deal). And it gets great gas mileage on the trail(better than most 4.0 mills).
I plan to use it this summer on some dunes, but my excessive hieght will be less than optimum there.
Its deffinitely not the bang for the buck, of an SOA conversion, 4:1 T case, or front and rear lockers.

Jeff
89 YJ
Wow, you can get a nice tan on your arms, from welding with no shirt on.
 

·
Registered
Joined
·
4,447 Posts
Yup, Dusy, and Coyote.
And that was with the rig fully burdened with 7 days worth of fuel and supplies. That was a good lil engine. I ran it for almost a year, with no problems.
That was sure a great trip too.

Jeff
89 YJ
Wow, you can get a nice tan on your arms, from welding with no shirt on.
 

·
Registered
Joined
·
4,447 Posts
Actually for a well equipt rock crawler, torque is not as much of an issue as it used to be.
When rock crawlers were running 35" and larger tires and had T cases in the 2.4 to 2.7 range, then you needed a fair amount of torque to keep chugging along on super steep and slow obstacles. But with 4.3 and 4:1 cases and even doublers on top of that, you dont need monsterouse torque or HP. Just a smooth powerband.
I typically dont have to do more than lightly apply the throttle for any obstacle when Im in 1st gear low (132:1), hell you could just about pedal up it. I usually start off and run in 3rd or 4th gear, when on anything but vertical climbs.
Most important is smooth power acceleration at between 700 rpms and about 1700 rpms, (which I dont really have with my current cam ) My 5.0 wants to rev hard, and is kinda unpredictable at about 1400 rpms to 1900 rpms, then it settles into a smooth power band (but at that point Im revving way to high).
So I try to run at no more than 1300 rpms, which the 5.0 is very comfortable at, and has plenty of torque. It also makes for very good fuel mileage, on the trail.
Now on the street, thats a different story, the HP and torque both work well to accelerate and cruise like any other high performance V8 sports car(ie: Mustang Cobra, Z28 Camaro).
I fully agree, that for most applications the inline 6 is very capable, and more than adequate.
That new Inline 6 vortec from GM, looks like it will be one hell of an off road mill. But it has some strange features also. Like a hole in the oil pan for the axle to pass through. But still, 275 HP and 270 ft lbs torque,is a very powerfull mill.

Jeff
89 YJ
Wow, you can get a nice tan on your arms, from welding with no shirt on.
 
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top