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Thread: L20 to L24e long block swap input needed

  1. #1
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    L20 to L24e long block swap input needed

    I'd like to get some outside input from you guys about an idea I had to swap in an L24E long block from a 83 maxima(810) in place of my L20. Im leaving behing the fuel injection originally equipped on this L24E. I'd be using my original L20 manifolds an carbs. I'm running tripple Solex 40's which is why I think the L24E may be as large displacement as these carbs would fit comfortably. Reasons being, first I'd hope to get a little more power, and second I've come across this L24E with 52xxx original miles in super clean condition at the local junkyard. From the reaserch I've done they should be directly compatible ads far as manifolds, starters, trans adaptation, etc.. Any input would be much appreciated.

  2. #2
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    Re: L20 to L24e long block swap input needed

    Is this for an S30 swap?

    The oil sump on the L24E engine is at the front of the engine whereas the S30 needs a rear sump oil pan (to clear the front crossmember). Therefore the L20 block and the L24E block are drilled differently for the oil pan pick up mounting.

    There is more than one way to convert a front sump block to a rear sump set up. The correct method (IMO) requires some machine shop work to drill out the rear boss to mount the oil pick up and then you need to block off the front pickup passage and re-drill the oil dipstick tube.

    Why donít you look for a good L28 block/engine from a S30? More displacement without having to mess with the oil sump pickup. And replace your carbs with the [larger] 240Z carbs.

  3. #3
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    Re: L20 to L24e long block swap input needed

    I should have clarified, I have a 72 GC10 skyline. If memory serves my L20 sub pan is located at the front of the engine before the crossmember. I didn't get a good look the L24e pan however so you bring up a good point. My other concerns were the fitment of the manifolds and distributor assembly. I'd be trying to utilize my original L20 distributor, carbs, and manifolds.

  4. #4
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    Re: L20 to L24e long block swap input needed

    I have a L24 E motor in my car now with carbs its all good you just need the stock oil pan and pickup.

  5. #5
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    Re: L20 to L24e long block swap input needed

    You said you need the stock pan/pickup, the stock L24 oil pan and pick up or the pan/pick up from the L20?

  6. #6
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    Re: L20 to L24e long block swap input needed

    You need the stock pan & pickup for your Skyline the L24e pan will not fit trust me I tried. I have pic's of both pans side by side.

  7. #7
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    Re: L20 to L24e long block swap input needed

    Because it's off of an injected Maxima it'll probably be a round port head - not the older square port head...

    There's plenty of literature out there on the inter webs that will tell you which head is best...
    But if it's just to get the car moving - you can drop in the whole L24, you can keep your L20 head and put it on the L24 block, you've got lots of options...

    I know you said you wanted to get it because its low mileage...
    but i still wonder if you wouldn't be better off with an L28 out of either a 280Z or 280ZX
    almost half a liter of displacement will always make a difference...

    i'll try to remember to check tonight about the spare distributor I told you about...


    This should get your head spinning about what's possible:


    http://www.zonc.org/TechnicalInforma...binations.html

  8. #8
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    Re: L20 to L24e long block swap input needed

    Use the Maxima distributor in your GC10.

    The 1979 to 1983 Maxima/280ZX distributor with the electronic E12-80 or E12-80A module and its corresponding ignition coil will provide a much better replacement for the older points type distributor and its coil.

    Diagrams on how to wire up the later distributor (and other info) can be found at:

    http://datsunzgarage.com/engine/

    http://atlanticz.ca/zclub/techtips/dist ... index.html

    http://www.viczcar.com/forum/index.php?topic=5211.0

  9. #9
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    Re: L20 to L24e long block swap input needed

    That's what I was telling ImPo...
    I think I have a spare one and I will give it to him as soon as I locate it...

    -e

  10. #10
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    Re: L20 to L24e long block swap input needed

    To be honest I was hoping to go with the L24 with MN47 head and high comp pistons. However, I am unable to locate any high comp pistons outside of JE for the low low price of only a thousand bucks.... After more research I basically want to use this MN47 head. The rest is up in the air. I would consider an L28 bottom end but would have to keep stock internals, high comp L28 with MN47 yeilds somewhere in the neighborhood of >11/1 comp ratio. At this point Ive got open ears as to what bottom end would mate well with this MN47 head.

    Do any of you guys know what the specs of the L24E engine are? I keep coming up with base L24 specs. If the L24 and L24e bottom ends are identicle, the engine build calculator I came across tells me I could use just the connecting rods from my original L20a with everything else that is L24e and yield a compression ratio of ~9.5/1. That being said, I still don't know where the stock L24e stands as far as comp ratio. I could just be wasting my time here if this L24e/MN47 combo already produces >9/1 comp ratio.

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