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  • How To Build A Stroker

    I currently have a 2005 Jeep Rubicon with the auto. No axle or tire upgrades have been done. (yet) It seems to be a big dog lacking horsepower. I would like to build the 4.0 into a stroker motor. Does anyone have a good link to the information on how to do this? Thanks again for the education you will provide me.
    Last edited by 05jeeper; 06-12-2007, 05:39 PM. Reason: Title Misleading

  • #2
    Originally posted by 05jeeper
    I currently have a 2005 Jeep Rubicon with the auto. No axle or tire upgrades have been done. (yet) It seems to be a big dog lacking horsepower. I would like to build the 4.0 into a stroker motor. Does anyone have a good link to the information on how to do this? Thanks again for the education you will provide me.
    http://www.jeep4.0performance.4mg.com/stroker.html
    http://www.mallcrawlin.com/forum/showthread.php?t=6364
    lots of info under the speed freaks section of JU and pirate4x4 is loaded too
    Last edited by str8country; 06-12-2007, 02:58 PM.

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    • #3
      http://www.jeep4.0performance.4mg.com/
      http://www.rockcrawler.com/techrepor...er40/index.asp
      http://autos.groups.yahoo.com/group/strokers/
      http://www.greatlakes4x4.com/showthread.php?t=9714
      http://www.pirate4x4.com/forum/showthread.php?t=505154

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      • #4
        Thanks, Looks like alot of good information for my reading.

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        • #5
          Originally posted by 05jeeper
          I currently have a 2005 Jeep Rubicon with the auto. No axle or tire upgrades have been done. (yet) It seems to be a big dog lacking horsepower. I would like to build the 4.0 into a stroker motor. Does anyone have a good link to the information on how to do this? Thanks again for the education you will provide me.

          whaterver you do watch which camshaft you get! some will cause knockin and other problems. I am trying to search my old info to find the cam you really want but it will take me some time since i have over 200 something pages on it all.

          In a nut shell a stroker is a 258 4.2L crankshaft and connecting rods with everything else 242 4.0 stuff making it 4.5+L

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          • #6
            the first cam i put in was a crane, lasted less than 5 mi. after waiting a month for them warrenty it, I put the stock one back in. two days after it was running again the 2nd one shows up in the mail... go figure. i think it will be a good project to put it in for this winter.

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            • #7
              so if im reading these build ups right, the only thing u need is the 4.2 crank and rods?

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              • #8
                yes that is the basis of the stroker.

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                • #9
                  i just might have to build me one of these, are these hp ratings with a stock setup or with a header, catback and CAI?

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                  • #10
                    All depends on the build, what you start with and parts used. Certain heads flow better than others, there are two different styles of cranks (might not effect hp but bottom end T, yes), ignition system (coil packs vs cap&rotor). and then things done to the motor, like balancing the rotating assembly, quality of port and polishing of the head, machine work to head and block(decking, resurfacing, boring, align honing, polishing crank, etc..) CR will change the min octane fuel, and the incorrect quench height may lead to spark knock.


                    Basically what I’m saying is you need to do extensive research on it before thinking about stroking your motor. then once you think you know everything, you'll pull the motor apart start all over cause none of the numbers you looked up are not the numbers you pull off the engine....

                    sure in theory you could pull the oil pan, main bearings and swap the cranks, but it wont gain you the full potential it could if you engineer the build correctly.

                    and to answer your question, the bigger you go, yes you will need all the bolt ons. but a 4.5l stroker can get by with a stock cam, injectors, intake, exhaust, depending on the year
                    Last edited by str8country; 06-13-2007, 01:49 PM.

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                    • #11
                      mines a 97 ive already got a CAI, borla header and catback, will the rest of my drivetrain hold up to the new power for a little bit til i get the money to change it

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                      • #12
                        Originally posted by playinmud
                        mines a 97 ive already got a CAI, borla header and catback, will the rest of my drivetrain hold up to the new power for a little bit til i get the money to change it

                        It should all hold up unless you got a d35 rear and 35" tires. If you search my past posts there is one about strokers that have numbers my buddy got with his strokker and minor stuff like bigger throtle body and exhaust stuff. But if your going to do a stroker might as well get all the bells and whistles and do atleast a 4.6L or 4.7L. I have still yet to find the correct cam that is perfect but i do know you want one with the lift numbers the same if not very close.

                        You can build a 4.5L basic stroker for less than 150 bucks if you search enough to find the parts. but that is just doing the crank and rods and keeping everything stock.

                        I have 20 bucks into my stroker build and i have the 10 rods and 2 crankshafts and i just need to take them in to get them cleaned and weight matched then i will start the engine build. I am just doing a poor mans 4.5L stroker first since I am diong my engine build in steps and I plan to have it apart again in 40k miles.
                        Last edited by 98sahara; 06-14-2007, 03:59 AM.

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                        • #13
                          im gonna be a senior in highschool so moneys a little tight, its the dana 35 in the rear with 33's, i just want to do a cheap hp gain that wont blow my motor like nitrous, plus i think it would be funny to smoke some kids in my auto class with their built 350's that are only getting them into the 15's in the quarter mile

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                          • #14
                            Originally posted by playinmud
                            im gonna be a senior in highschool so moneys a little tight, its the dana 35 in the rear with 33's, i just want to do a cheap hp gain that wont blow my motor like nitrous, plus i think it would be funny to smoke some kids in my auto class with their built 350's that are only getting them into the 15's in the quarter mile

                            with just doing the crank and cam shaft you will get about 220hp and 305tq thats what my buddy got and he had exhaust, throttle body, and i think he had his head ported too for that build but im not sure. I would find a running 258 - sometimes can be had for free- and use the crank and rods out of it. with some searching you can build a basic stroker for real cheap and use the money on other things like upgrading the rear axle.

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