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Thread: 18tz in slayer

  1. #1
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    18tz in slayer

    Hello so I have a 18tz/3.4 losi carb with a tm crank and pull start I just need to know what else do I need to put this in my slayer pro

  2. #2
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    So my cousin I got it from told me it’s not a tm crank it’s the 18tz-tx with pull start

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    RC Turnbuckle Jr. olds97_lss's Avatar
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    Did it come with a revo style manifold? If not, the stock one won't work with it. I only ran the 18TM and 21TM engines in my revos, never the TZ. I run a THS revo pipe on them, but I use associated 1/10th exhaust gaskets vs the one that comes with the pipe as it's a bit thicker/not ribbed to fit the 2.5/3.3 engines.
    https://www.youtube.com/c/olds97lss

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    No pipe I was going to just buy the bb kit that come with a revo pipe that will fit

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    RC Turnbuckle Jr. olds97_lss's Avatar
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    Carb arm for revo/slayer: https://www.amazon.com/Engines-23818.../dp/B000X4J0SG
    Gasket for header: https://www.amazon.com/Engines-21427.../dp/B000X4KTAO
    OS header: https://www.gravesrc.com/os-exhaust-manifold-revo.html

    The 18TZ uses the same carb as the 18/21TM, the 11K slide, it just has a different arm on it.

    I find that the arm is a bit too short though, so I shim up the pivot piece with a couple washers, or the arm barely touches the pivot.
    https://www.youtube.com/c/olds97lss

  6. #6
    RC Champion grizzly03's Avatar
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    Quote Originally Posted by olds97_lss View Post
    Carb arm for revo/slayer: https://www.amazon.com/Engines-23818.../dp/B000X4J0SG
    Gasket for header: https://www.amazon.com/Engines-21427.../dp/B000X4KTAO
    OS header: https://www.gravesrc.com/os-exhaust-manifold-revo.html

    The 18TZ uses the same carb as the 18/21TM, the 11K slide, it just has a different arm on it.

    I find that the arm is a bit too short though, so I shim up the pivot piece with a couple washers, or the arm barely touches the pivot.
    I turned the carb and carb slide arm to work better. I turn the carb so the carburetor slide arm goes into the pivot arm assembly more. And then also adjusted the carb arm angle to fit better in the pivot arm slot.

    Also not sure if the OS arm fits on the Losi 3.4 carb? OP said they had a "18tz/3.4 losi carb engine".

  7. #7
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Quote Originally Posted by grizzly03 View Post
    Also not sure if the OS arm fits on the Losi 3.4 carb? OP said they had a "18tz/3.4 losi carb engine".
    I missed that. Not sure why you would run that though. The os carb is really good.

    I did try the 3.4 carb on my 3.3, but it kept binding on me no matter how I situated the carb/arm/linkage. I ended up running an old OS 11K carb on it I had from a very tired 18TM until I eventually replaced the engine with a 21TM. Was a very solid carb, easy to tune and would hold it all day long.
    Last edited by olds97_lss; 02-23-2021 at 01:15 PM.
    https://www.youtube.com/c/olds97lss

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    I had a old losi 3.4 from a jato I acquired, it works not sure as performance wise yet but the carb that came on the motor was a rolling barrel type so I just swapped it

    Now I’m a little confused about the crank issue do I need to shorten the threads or something ?

  9. #9
    RC Turnbuckle Jr. olds97_lss's Avatar
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    Quote Originally Posted by 2000ss View Post
    I had a old losi 3.4 from a jato I acquired, it works not sure as performance wise yet but the carb that came on the motor was a rolling barrel type so I just swapped it

    Now Iím a little confused about the crank issue do I need to shorten the threads or something ?
    There are 3 cranks that fit the engine. It came with either a bump start pilot crank with standard SG threads (and slide carb), a pull-start threaded crank (and rotary carb) that requires a clutch adapter nut and the 3rd is the TM crank which has traxxas threads and pull start provision that comes in the 18TM.

    TZ pilot shaft crank (OSM21912010):


    TM pilot shaft crank (OSM21912000):


    If yours is the TZ threaded crank (OSM21912040), which I'm assuming you have:


    You will likely need to cut the crank, get some proper shims to push the flywheel out a bit as needed and a clutch nut adapter.

    Adapter: https://www.amazon.com/Traxxas-4144-.../dp/B0006O5M3U
    Shims: https://www.amainhobbies.com/team-as...sc89148/p16788

    I believe the shims are 7mm to move the collet/flywheel out a bit and 5mm for the CB bearings. OFNA used to make a really great clutch shim kit with spacers, adapters, etc, but it doesn't exist anymore.

    Associated made a special nut for cutting cranks. You would put it on the crank, cut the crank, then remove the nut and it would straighten the threads. It would leave the appropriate amount of threads:
    https://www.amazon.com/Associated-76.../dp/B0006O3CT6

    I never used that, but I have cut a few cranks over the years. The engines I did it with came with a standard nut that was kind of thin and I just put that on, then cut the crank 3-4 threads beyond it, dress the end a bit to round the edge after cutting it, then back the nut off to straighten the threads.
    https://www.youtube.com/c/olds97lss

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