Looking for some advice. Let me run some ideas past you about building the 3.4L?

Discussion in 'V8 - Performance Upgrades' started by V8mr2, Feb 21, 2018.

  1. V8mr2

    V8mr2 New Member

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    Ok, so I have a 1988 toyota mr2 and I have a buddy who got his hands on a 97 taurus sho v8 to use for derby. He said when he is done he would let me have the front clip for cheap, so I can swap it into my mr2.

    Ok so my ideas.
    The 3.4L by my understanding is a cosworth block with yamaha heads right?
    So I have a toyota 3sge redtop beams engine that is also a metric 2.0L inline 4 with a yamaha dohc cylinder head on it that has the vvti solenoid on the Intake cam.
    My question is would it be feasible to swap the beams cylinder heads onto the 3.4L engine then punch out the piston liners and boring the block to accept liners that will fit pistons from a toyota 1uzfe 4.0L v8 and also swap the 1uzfe crankshaft and even the rods if possible.
    Then wire it up with a stand alone computer like megasquirt or motech?
     
  2. stephen newberg

    stephen newberg Moderator Staff Member

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    Seriously? Sure, you can do anything if you spend enough money. Practical? Not a chance.

    pax, smn
     
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  3. E1

    E1 Crash Tested

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    What is your centerline measurement for cylinder spacing on the Honda? Similar to the 3.4?

    I have a back burner 3.4 project with 96 4.6 Cobra B heads that come remarkably close to the mounting holes and spark plug centerlines. I can actually get several headbolts in and a Cobra headgasket would work for this project.

    Sure, a few passes with the mill and some flat out fabrication on the front cover but...


    it.

    could.

    work!

    You want to remove material from the heads, you don't want to add it as you will mess with the tempering by welding too much.
    If you cylinder spacing for the donor heads is adequate, what about coolant passages lining up? Is there a chance in hell you will get anything resembling a respectable head gasket?

    Those questions ought to get you off in the right direction. We'd need a lot more information to help much more.
     
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  4. V8mr2

    V8mr2 New Member

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    Ya once I get the motor and get it on the stand. I'l tear it down and chase down a used 1uzfe 4.0L engine to canabilize and see how the 4.0L head mate up.

    The more I think about it, the inline 4 ylinder heads would be a massive under taking. I would have to machine the valves to swap the exhaust valve with the intake and port match the intake ports to the exhaust ports on the other bank. Plus I'd have to flip the cams on one of the cylinder heads aND machine the end of the head to accept the cam gear on the oposit end.

    Im think that to toyota 1uzfe 4.0L rotating assembly with the 4.0L heads would make a pretty good upgrade and I'm pretty sure they would mate uo with little machine work involved.
     
  5. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    You can also keep the entire intake of the Yamaha V8 and porterize it at the maximum. If the cams on the 3.4 head are welded (we can help you with that), they will be very reliable. (Cam timings on them cannot be upgraded as they were factory upgraded at the max at the start !)

    Replace all the tubing by better ones (of 3 inches diam for better air flow), keep the MAF, it's the same as F-150 on 5.0L/5.7L motor (!)
    Cone filter (keeping cold air)
    Porterizing the surge tank
    IMRC delete (always doch)

    You will have a motor with around 250-255 hp already with no fitting and an incredible sound (big japanese motorcycle sound). And this will take less place that 4.0L heads under a hood of a MR2... This entire motor is good but it was muselated and constipated by the car itself (you don't have to deal with it like us).

    It's just my 2 cents. :) Good luck anyway you choose.
     
    Last edited: Mar 15, 2018
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  6. stephen newberg

    stephen newberg Moderator Staff Member

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    I pretty much agree with the post just above.

    pax, smn
     
  7. gamefanatic

    gamefanatic SHO Member

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    The good thing about these engines for the moment is they are relatively inexpensive for a new short block. Running less than $500 shipped to your door. Heads can't be found new, to my knowledge, but are durable and can easily be ported for greater flow.

    Like GEN 3 SHO fan mentioned, CAMs must be welded, or just start a fire pit for your money now. These engines can be driven hard for a long time with proper maintenance.

    ECU support, while available is not complete from the stock versions. You may be good with what they provide, I still don't have the ability for real time monitoring with my TweecerRT and have yet to get a strategy for the Moats, or go with a megasquirt or haltec. You would just need to supply the base values, which for the most part are available either through the ECU or alldata info.
     
    Last edited: Mar 17, 2018
  8. RonPorter

    RonPorter Old Dude

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    Not a Cosworth block, but a V6 Duratec 2.5 with two cylinders added. Many years ago, a couple of us had a semi-plan to adapt a Whipple/Eaton to the top of the IMRC lower manifold, and ditch the intake setup. The intake is less than optimal, and I don't think it would look very good in anything but an E-W FWD setup.
     
  9. E1

    E1 Crash Tested

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    Many years ago, a couple of us DID.
    :)
     
  10. RonPorter

    RonPorter Old Dude

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    IIRC, you guys kept the intake, with either the roots type or the centrifugal.
     
  11. E1

    E1 Crash Tested

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    No Sir.

    http://www.v8sho.com/SHO/SHO R.T.S..htm
    Scroll a little past half way down for completed project pix.

    I made a big ol box and bolted it directly to the heads. Doug Lewis had a couple spacers machined to replace the LIM and made a low boy box plenum to bolt on top of that.

    We both completely ditched the snakes and LIM/Butterflies.
     
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  12. stephen newberg

    stephen newberg Moderator Staff Member

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    So, what was the result, Eric? Anyone dyno before and after to figure out what had happened?

    pax, smn
     
  13. RonPorter

    RonPorter Old Dude

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    Forgot about that whole setup! For some reason I thought that you had mounted it off to the side.
     
  14. gamefanatic

    gamefanatic SHO Member

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    There is another setup that I saw pictures of that I believe was done through FPS that had the blower off the rear head. Can't remember much about it other than they did a real nice job on it.
     
  15. luigisho

    luigisho SHO Member

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    I remember Mick had one done by FPS a while ago.
     

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