Supercharger for a 4.0/4.2 -
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post #1 of 5 Old 01-19-2010, 11:52 AM Thread Starter
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1984 CJ7 
Join Date: Sep 2008
Location: Howard Lake
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Supercharger for a 4.0/4.2

I'm in the process of building up a 4.6L stroker for my CJ7. I've got most of the hard parts to do the bottom end. Jeep strokers has been alot of help with digging up the right parts. The next step is to figure out what I can do to supercharge this.

My idea at this point is to get a Eaton M112 and figure out how to get it to fit onto a 4.0L head. Does anyone know of anyone that has produced an intake manifold that would have bolted something like this onto a 4.0L. I understand that there has never been one manufactured just for this application. What I am looking for is something that is close and can be modded to make it work.

My idea is to mount the SC on it's side (if you look at how the Mustang Cobra has it mounted). I've thought about an intercooler between the SC and intake like the Avenger system uses. At this point, there is more room to go out sideways than up. If I have to, I'll fabricate my own intake manifold, but I would rather not do that at this point. Modding something is a little easier to start out with.

Thanks in advance,

I'm beggining to understand the true meaning of 'Just Empty Every Pocket'!
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post #2 of 5 Old 01-19-2010, 12:16 PM
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post #3 of 5 Old 01-19-2010, 12:44 PM
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How are you going to control fuel and spark?

07 JKU - 6spd - LSD rear
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post #4 of 5 Old 01-19-2010, 11:18 PM Thread Starter
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I'm not impressed with the Avenger system. For the huge expense, you still have to figure out all the fuel and spark stuff on your own. Yeah, you get a SC and a manifold, but it's a smaller cc SC equating to a smaller pump and it bolts to a stock manifold which limits my hood clearance. The M112 is the perfect size SC for a 4.6L app once you look at the compressor map, especially for an engine that will never see over 3500 rpm. I want it all right off idle. For that kind of money I can have a manifold casted for my needs, once I figure out how to support all that weight on a 12" lever off the side of the head.

I've been looking at the latest version of MegaSquirt and the Accel Thruster System. MS is cheaper, but it doesn't look to have the adjustability at this point. Accel has the ability to run boosted systems and it's sequential, but it's 3 times the money. I will not be doing anything with the factory injection for a 4.0L, every mod I've seen for that is just a bandaid for the factory program. And I still won't be able to adjust fuel under boosted conditions.


I'm beggining to understand the true meaning of 'Just Empty Every Pocket'!
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post #5 of 5 Old 01-20-2010, 12:28 AM
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My understanding the MS is fully adjustable, can run ignition and fuel, control boost, and can even control an auto trans. It all depends on what add-on boards and relays you use. You ought to contact them and see what they have to say.


1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

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