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Old 09-30-2013, 10:46 PM
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Turbo for a 4.2?

can a 4.2 handle a turbo? 87 yj 4.2l L6
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Old 09-30-2013, 11:06 PM   #2
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Originally Posted by YJ Tim View Post
can a 4.2 handle a turbo? 87 yj 4.2l L6
I haven't seen or heard of it done before. I wouldn't even consider a turbo if my engine wasn't rebuilt. Turbo's are really only useful at high rpms which is useless on a jeep unless you do serious mudding. Also, the only turbo's I think you could get away with on a 4.2 would be universal which usually fail after like 60 miles or so on a carbed inline 6

Build Thread 1989 YJ, np231 sye/wide chain/6 pinion planetary, D30/8.8 ARBs/4.56, 31" rollers for now, bds 3.5" springs, 1" Boom Shackles, crossover heim steering (Soon to come: TBI 350, 4l60)
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Old 09-30-2013, 11:44 PM   #3
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^^ Sorry dude, you dont know much of anything about turbos.

You can easily have a turbo that spools at low rpms, and you can also use any turbo on any motor. You would need to build the piping for it, and build the motor for it. Guys have been racing AMC 258's for years, so I would look into the car side of things because I am sure it has been done.

I wouldn't do it, but if I were gonna, I would be looking into main bearing studs, high strength rod bolts, and a ported and polished 4.0 HO head with studs. You could probably run 8-10 psi safely on a completely stock motor, but no more than that. Cheapest way to do it would be a remote mounted wastegated "tailpipe turbo" setup.

While it is possible, I would never do it due to the complicated nature of the setup. I like my stuff simple when I have to troubleshoot it on the trail.
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Old 09-30-2013, 11:53 PM   #4
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A friend of mine put a turbo on his scrambler in the early 90s but I can't remember all the particulars of how he did it. I know he rebuilt the engine with all high performance parts and low compression pistons but I can't remember what turbo he used. The thing accelerated like a Corvette on the freeway and he drove it for over a year before he blew it up. As a 4x4 application I don't see the point but it sure was fun on the street
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