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4.0 SOHC Performance Motor Build

Discussion in 'Need for Speed!' started by Jakee, June 21, 2009.


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    1. Jakee

      Jakee Elite Explorer

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      I don't know how far you are from this but I'm going to try to make this. I have a bud that is running his dragster for the first time here.

      SanAntonioRaceWay.JPG
       
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    3. Limited02

      Limited02 Well-Known Member

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      Does your Sport have adjustable headrest???
       
    4. htrdlncn

      htrdlncn Active Member

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      SAR is a bit farther for me as I am NW of Austin and I usually go to run at the track,
      so I try to avoid big events as you usually get very few runs in
       
    5. Jakee

      Jakee Elite Explorer

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      I would also like to report that 12lbs is going fine here. The ONLY mishap I've had was blowing the intake pipe off the TB which damaged the powder coat finish and gave me a bit of a scare. That is it. I need to make it a habit to check the tightness of the turbo clamps when the temp changes. Maybe once a month would be a better.
       
    6. Limited02

      Limited02 Well-Known Member

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      The reason I asked if you have adjustable headrest is because you can easily stick a digital camera between the headrest and it makes a perfect mounting point for the camera. I'd really like to see an interior shot of the track when you run. Only problem is you can't press down too hard because you'll "stop" recording:(

      A few members are talking about a small meet up here in KS and possibly running at the strip. I haven't done anything new so I'm not sure if I'll run. Was hoping for 14's this year, but it's not looking like it'll happen. Goodluck on hitting 12's!!!

      What are the main changes since you last ran mid-13's???
       
    7. Jakee

      Jakee Elite Explorer

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      The changes (I remember cuss I don't get to work on it often)

      Wider tires so I can give if more gas out of the hole.
      PVC evac system with the help of the turbo to pull it out (didn't do much if you ask me)
      Exhaust cut-out right off the turbo
      Meth injection
      9 to 12lbs of boost

      The rest is just supporting mods. I'm probably forgetting something.
       
    8. Jakee

      Jakee Elite Explorer

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      I didn't run this past weekend but my buddy did!
      wheelie.JPG
       
    9. Jakee

      Jakee Elite Explorer

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      I promised this along time ago. Not a great pic but better than nothing. This is my X sitting in the back yard and getting hungry.

      XSport.JPG
       
    10. rocket 5979

      rocket 5979 Resident Gearhead

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      Those wheels don't look too bad.
       
    11. Jakee

      Jakee Elite Explorer

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      Yes, they actually look pretty good on a sport. The fronts had to modified to fit, bored out. (not the hubcentric part but the lip where the center cap fits)

      So I still have to have center caps custom made to fit the fronts. The rears fit perfect. I'm running 255-50-18's on the front and 295-45-18's on the rear.

      no grey cladding anymore, which really makes a difference in my opinion. I used bed liner and krylon fusion satin (over a year ago); seems to be holding up quite well.

      I'll try and get some clearer pics soon.
       
    12. Limited02

      Limited02 Well-Known Member

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      Looks great Jake!!! It wouldn't hurt to take a few more;)

      Any chance of hitting the track this year or is it over for you? I didn't get to do what I wanted this year because I had a big purchase recently(;)) and that left no money to play with. Also got the lady a new car so that didn't help either, but it's a sweet and quick ride. Hopefully 2012 will be the year that I can take the #1 NA spot if my Explorer feels up to it....

      Edit: Didn't see your previous post. Have you lowered it at all or is that in the works???
       
    13. Jakee

      Jakee Elite Explorer

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      No, I still want a lower time with what I have, so the track is still on my to do list. But like you, other priorities take front seat to this.

      It's lowered by 1" now but needs a little more. (another one on my to do list)

      I want to start driving this everyday so I'm working on the comfort part of the truck. I've actually done a lot of interior work and want to add custom seats soon. Maybe a sub. I'm going to put a cat converter back on it and have the cut-out before that. (so I'll have the best of both worlds) fun fun fun
       
    14. fishy2k8

      fishy2k8 Active Member

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      I'd like to throw some information in this thread... Now this research and these parts are based on a 4.0 OHV motor with 49CC heads so when calculating compression take that into consideration... but here it is...

      Probe pistons from for a 331/347:

      Bore 4.000"
      Compression height 1.175
      20.1cc dish

      Eagle 6.000" rod for sbc with journal bore turned out 0.025" to mate to the 2.125 rod journal on the 4.0 crank

      with a stock 4.0 crank

      These parts are advertised to handle 700hp in a v8, meaning it'll be able to handle whatever i throw at it basically (350-400 rwhp)

      This combination of parts gives me a .013" deck clearance which should give me plenty of quench in the cylinder.

      with my 49cc heads i'd be sitting at 9.51:1 compression, which is exactly in the range that I am wanting to be at.

      Bottom line.. i think this has great potential! The only thing i really gotta figure out first before going forward is what the machining will cost to get the rods reworked a little, don't think it'll be too far outta the park though. I'll have a spare 94 4.0 motor here in a couple weeks that i can tear down (90-94 blocks are thicker and allow for the 4.000" bore without compromising a ton of strength)
       

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    15. CDW6212R

      CDW6212R Hauls the mail. Elite Explorer

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      Interesting, they can reach to a 4.0 bore. What exactly is the bore spacing of the 4.0 blocks?

      If the rod lengths are that close to a common 302 or Chevy, I'd be working out a stroker piston and rod, and have the crank turned a bit.
       
    16. fishy2k8

      fishy2k8 Active Member

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      i'm not sure on the bore spacing, but the most knowledgable guy i know on these older 4.0s stated that the 90-94 blocks can safely hold a 4" bore and i believe him.

      as far as stroking the motor.. i'm not really interested in it because it'll raise the machining cost quite a bit and i rather keep it a fairly easy, good revving motor which ill have with the current picked combo of parts
       
    17. CDW6212R

      CDW6212R Hauls the mail. Elite Explorer

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      Jake is going to get a new 4.0 engine built one day, and find a trans strong enough to take the power. He and lots of people could use any new information that we can dig up.

      It looks like a strong stroker crank may be the one needed special part for the engine.
       
    18. fishy2k8

      fishy2k8 Active Member

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      yeah a stroker crank would be cool, but i only know of morana's stroker kits/crank available.

      The parts i listed would work for either ohv or sohc, but you'd probably want to run a smaller dish on the pistons to bump the compression to where it should be since the champers on the sohc heads are about 11cc larger.

      I have a couple emails out to some machine shops getting quotes on what the machining will run for the rods and the bore.
       
    19. Jakee

      Jakee Elite Explorer

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      I'm trying like heck to get in the 12's with a the stock block. I would really like to make this goal before I continue.
       
    20. fishy2k8

      fishy2k8 Active Member

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      yes man that would be awesome! I just really don't want to blow a rod or break a piston and hurt one of my very expensive heads... Just piece of mind that i know i can run a more aggressive tune and more boost and not worry about the motor pooping out due to over stress
       
    21. fishy2k8

      fishy2k8 Active Member

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      I got a quote from a shop... It's about $125 for the work to the block and about $125 for the rods to get worked. Def not bad
       
    22. Jakee

      Jakee Elite Explorer

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      Not bad at all
       
    23. jah81592

      jah81592 Well-Known Member

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      I know you can do it, I did! Your combination is real close to mine. I went 12.70's on 8# boost.
       
    24. Jakee

      Jakee Elite Explorer

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      It would suck if I'm at 12 lbs of boost and can't do it. I'm just not sure cuss I haven't been in a while. The good thing is the trans seems to be holding right now. I do have the 1-2 flare when at light throttle which seems to be getting worse. I hope that's not a sign.
       
    25. Jakee

      Jakee Elite Explorer

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      Constructed a new down pipe with a side exit exhaust. 4" stainless into a 4" cat converter, no muffler, going from round tubing to oval for clearance out the passengers side right before the rear tire. Learned to weld with this project and will post pics after a do the final slash cut.
       
    26. Limited02

      Limited02 Well-Known Member

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      Standing by for pictures and results...:popcorn:
       

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