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4.0 OHV & SOHC Go Fast Goodies!!

Discussion in 'Need for Speed!' started by Rick, December 12, 2006.


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    1. arco777

      arco777 Elite Explorer

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      Never got answered...

      Answer is yes, basically. Same block, same general design and all that, but the SOHC has increased in power output somewhat over the years so I'd expect different heads/cams/etc to have been used depending on the year and application. Still, the 4.0 SOHC in the new Mustangs makes many performance options available for OHV and SOHC Explorers.
       
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    3. tjsxplodr

      tjsxplodr Well-Known Member

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      Bumping this up once again!
       
    4. Jakee

      Jakee Elite Explorer

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      I'll give a hint...

      morana v6 racing
       
    5. tjsxplodr

      tjsxplodr Well-Known Member

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      I'll check it out thanks.
       
    6. tjsxplodr

      tjsxplodr Well-Known Member

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      Would it be better to rebuild my OHV 4.0L and install better guts/heads or would I benefit from upgrading to the SOHC 4.0L for a SC build?
       
    7. Jakee

      Jakee Elite Explorer

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      I would go with a 4.0 SOHC but that's me.
       
    8. tjsxplodr

      tjsxplodr Well-Known Member

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      So with that engine, I would not have to build it up to put in a SC? How strong is it?
       
    9. briwayjones

      briwayjones Manual Master

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    10. tjsxplodr

      tjsxplodr Well-Known Member

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      I dont think its a supercharger....its says supercharger plate.
       
    11. Jakee

      Jakee Elite Explorer

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      It all depends on how far you want to push the motor. For a roots type blower running under 8 LBS and tuned correctly, you shouldn't have a problem with a stock 4.0 SOHC. For the root's blower your enemy will be the intake charge heating up. The further you push the power adder out of its range, the more the air charge will heat, which in return can cause the engine to start detonating. (the explosion happens before it's supposed to and while the piston is on the way up) You want the explosion to happen at a point where the piston will not bind in the cylinder.....anyways, I don’t want to ramble off topic too much in this thread.
       
    12. tjsxplodr

      tjsxplodr Well-Known Member

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      Ok, so what about the stock OHV motor? Is it the same as the SOHC? What's the differences in it?
       
    13. Jakee

      Jakee Elite Explorer

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      I'm not 100% about the actual type of rod in the ohv but one thing in your favor is the ohv has a 9.1:0 CR where the SOHC has a 9.7:0 CR. The lower CR will resist detonation a little better but it won't make the same power as the SOHC at the same level of boost. (the sohc will be a little more powerful)

      If you already have an OHV then it would be easier to stick with it. Just state your goals and someone can direct you better.

      EDIT - something doesn't look right in this post. Who can find it?
       
    14. tjsxplodr

      tjsxplodr Well-Known Member

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      Yes, I have a 1991 OHV engine that's on its final leg. Its got one or more lifters knocking, and its getting louder.
      Since I am unsure what the stock power is in the OHV's, I'm kinda not real sure what HP levels I'm wanting. Once I know stock power, then I can go from there. I can't imagine it being very much like 200 HP, if that. I'm wanting a get-up-and-go SUV, that not only has speed but more power. I'm not a speed demon, nor do I go off-roading. I just want more power in my engine, without having to go thru the pains of a V8 swap.
      I think supercharger vs turbo would be better? I want the power all the time. I also want to be able to work on it myself.
       

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    15. Jakee

      Jakee Elite Explorer

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      A roots type blower would be easier to install, if you had the SOHC, because RPCaster has a kit on ebay. I don't think he has a 0hv version.

      The turbo would give you more power but the tradeoff against a charger is; it's harder to install; not quit the same throttle response; and a different sound.

      You could search a name "Doug904" (AKA bama chips owner) and you'll come up with a lot of hits. He's one of the only I know about that has really made some power with the ohv back in the day. I believe he built the motor and ran nitrous.

      It's up to you but if you just want more power without breaking the bank then the OHV does have potential. You can also use a SOHC oil pan to strengthen the bottom end a bit. Not to mention Morana has a girddle for it.
       
    16. tjsxplodr

      tjsxplodr Well-Known Member

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      I won't use nitrous, period. If I'm gonna make power, I want to do it right. So noone out there makes a sc for the ohv's??

      What does a girddle do?
      Posted via Mobile Device
       
    17. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      compression ratio

      OHV compression ratio is 9.0:1
      SOHC compression ratio is 9.7:1
       
    18. tjsxplodr

      tjsxplodr Well-Known Member

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      Ok so what does that mean in terms of me deciding to choose which engine to go with? The OHV has less compression ratio, but people are saying the SOHC makes more power. How hard is it to swap the SOHC engine into my '91? Will I have to swap wiring or stuff like that? What years are available for the SOHC that would fit my engine compartment?
       
    19. Jakee

      Jakee Elite Explorer

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      Yes, you'll have to swap the wiring and the PCM and more.

      I'm trying not to tell you what to and just guide you.

      Just keep reading. Try finding others results (not words, but honest perfomance results)

      I have the SOHC and a turbo. My best time in the 1/4 is 13.4 on street tires. There are videos somewhere in here and on youtube. This can be alot of power for some, and nothing for others.

      Look at the Mounty in the first thread of this section and you can see he's a full second faster than me with a built V8 and turbo.

      There are many many more powerful explorers and they got that way with alot of work, money, research like you're doing, and a bit of a crazy owner... ;)

      I believe BBK use to make a charger kit for your motor.
       
    20. tjsxplodr

      tjsxplodr Well-Known Member

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      Lookin stuff up, found out that Vortec no longer makes SC's for the 4.0. I found an M90 Eaton SC off a TBird for sale on ebay. Will this fit? If so, how much boost to go onto a stock engine?
       
    21. Jakee

      Jakee Elite Explorer

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      My recommendation will be 8 LBS, a good tune that will pull timing based on the air temp, and around a 11.1 Air to fuel ratio.

      If I were in your shoes, I would go turbo. I stated previously that the m90 roots style charger would be easier to install, but that's not true with your set-up because there's not a direct kit that I know of. So you'll be modifying anyhow so why not go turbo? This way you won't be restricted to the amount of boost (the m90 can only spin so fast with a smaller pulley)

      Then you have to think about how you'll tune it?
       
    22. tjsxplodr

      tjsxplodr Well-Known Member

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      I think I've made my mid up to do a 5.0 swap. The turbo setup takes too much custom fabrication that I won't b able to do on my own. At least with the swap, I can get help from hubby and neighbors to put in the engine and tranny.


      Posted via Mobile Device
       
    23. tjsxplodr

      tjsxplodr Well-Known Member

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      Now darn it! I am not so sure about the 5.0 swap. I'm still in limbo what I wanna do with my engine.
       
    24. Sundaywhipped

      Sundaywhipped New Member

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      Goal of mine is throwing a turbo on my 4.0 ohv, it's a '00 with 128,000. What psi can I run stock until I get more parts and how would I go about this? My buddy builds turbos for the chevy v-8s so he'll build it but he knows nothing about the.motor to know it's limitations. Please inform me if you could help
       
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    26. mr cribb

      mr cribb US Army Retired Elite Explorer

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