HP and torque are a product of total engine design. A very basic simple design in high torque engines is a longer stroke. Short stroke, large bore typically high HP low torque, again this is basic. Depending on the cam grind, valve sizes, exhaust/intake ports lots of mods can be done.

I am not saying you cant get ass loads of torque from an OHC. After all the big Cats, Detroits and MB are I6 with OHC's. But we arent running a 30k motor. Its a cheap v6, a cheap ohc v6 may be worse.

I agree with not going crazy with this engine as well. Its not exacty high performance. Might not be a good base to start with.

 

Why would you want a used cam from a motor in a junkyard? You do know that you'll have to pull everything right? Camshaft, pushrods, valve guides, rocker arms, the whole nine. Then put them back in exactly the same order in your engine.

Now since you're the one that asked

I'm assuming you don't know if there is or is not a cam out there that will give you better performance over your stock cam. So, how do you know that the used cam you're taking from some junkyard motor will give you better performance? Why would you want to go through all the trouble of keeping the lobes plus hardware matched for a cam that may not do anything for you.

I would think it would make a lot more sense to buy a new cam kit, if one is available that is.

 

Ok some of you still dont seem to get it. The cam is probably the single best area for making power gains because your increasing valve lift and duration. Add that with some valve springs, lifters and rockers and some decent power can be made. Now, im not saying a junkyard jeep cam is gonna make a world of difference, BUT if it has different specs and increases duration/lift youcan make some cheap power. You can grinde a cam to meet specific needs. Depending on the specs, you culd make your motor have more high end or low end HP and the same goes for torque. I was asking if anyone knew anything about the specs in the other motors because theres a posibility that they are different since the vehicles they are in are differnt types with different nees.

Yea, you gonna have to remove some stuff to do it. Big deal, i work on airplaces for a living, i can handle a cam install. You can swap a cam without swaping the pistons and crank, without increasing the stock compression ratio and still run pump gas.

Obviously nobody kows anything about other 3.8 cam specs. SO, does anyone know of a company or shop that makes a cam for the 3.8?

 

What about just changing the rocker arms to ones with a higher ratio?

 

Stil wrong DOHC would be a four cam motor in a v-6.

 

Ok... here is some engine teachings from an engineer's perspective. OHV tends to drive a flatter HP and TQ curve. This is important for us Jeepers as we want to start out with more TQ at those low RPMs. To say that OHC drives more HP... well that really depends on the design.

As for oversizing your CAM... it will absolutely create more power. Couple that with a Super charger and you have a great combination. Of course, by doing this, you reduce the service life of the engine as a result of additional stress to the system. Cyclic loading and all that crap...

Hope that helps.

 

Who is going to be the first to put the 4.0L I6 in a jk?

 

even if it was a dohc, that would mean that there would be 4 cams.



-sorry, didn't realize someone else had already pointed this out.

 

i actually looked on comp cam and crane cams websites last night and didnt find anything. u can look at jegs website and type in cams and the click on mopar and see if u find anything.

 

Personally I couldn't care less about ON road power capabilities. My main interest where power is concerned is OFF road. So I believe gearing is where I will look to for more power/torque to the wheels before I consider doing any major engine upgrades. The RockTrack 4:1 transfer case provides excellent power transfer to the wheels. The Atlas 6:1 would make even more. Couple that w/a good r & p gearing of 5.13:1 or even the 5.38s that will be coming out soon and you should have a descent on road machine and an off road machine that will be almost unstoppable.
Well that's my .02 for OFF road power.

Now, as for the mans original question;
I wouldn't mind knowing if there was an aftermarket cam as well.
Given the newness of this model wrangler, I would guess there isn't anything out yet. But I would imagine that there is a company out there considering it and the marketability of it.