GP7 Spark Arrestors

Discussion in 'Electo-Motive Division (EMD)' started by Matt Fisher, Feb 27, 2022.

  1. Matt Fisher

    Matt Fisher Member

  2. geep07

    geep07 Member

    Well , I'll be danged.
    They are extensions of the spark arrestors for non turbo charged units we're used to seeing .
    modeltruckshop likes this.
  3. It works this time. That’s a great shot and shows the spark arrestees well. Thanks

  4. The box was just .020 evergreen styrene. The stainless mesh was just stuff I had in my accumulation, I have no idea who or what it may be from. But it’s easy to buy online. eBay has lots of choices in stainless or brass. Plano also offers a few patterns.
    Ozarktraveler and Matt Fisher like this.
  5. SLSF Freak

    SLSF Freak Staff Member Staff Member Supporter

    Well this weekend I made a thing. After looking at several pics of these things I think this is pretty close:

    The shape of the box from top view is about 7.5 x 11.28mm for HO scale. The only thing I couldn't figure from the pics is if those box shaped areas in the bottom corners are open and covered with a fine mesh grill, or if they're just darker from heat (guessing grill but I can't print that fine.) Here's a cropped pic from our archives:
    My GPs are at my dad's house right now so I couldn't play around with these on my units.

    Cheers -Mike
  6. That looks great!
    rjthomas909 likes this.
  7. Matt Fisher

    Matt Fisher Member

    OMG those look freaking awesome. Can you make me some?

    Last edited: Mar 13, 2022
    rjthomas909 and modeltruckshop like this.
  8. SLSF Freak

    SLSF Freak Staff Member Staff Member Supporter

    Sure thing - I just need to verify a couple of minor measurements to make sure everything fits right and it should be good to go.

    modeltruckshop likes this.
  9. gjslsffan

    gjslsffan Staff Member Staff Member

    HO scale too?
    Ozarktraveler likes this.
  10. SLSF Freak

    SLSF Freak Staff Member Staff Member Supporter

    Yes - I figure if anyone in the group here wants them chances are high it needs to be HO. I did make a version for N Scale as well since I'm an N Scaler and we have a handful of us represented on the board. However I haven't printed that one out yet so it may need to be adjusted.
  11. gjslsffan

    gjslsffan Staff Member Staff Member

    Ive got a few more GP7's to build and at least one has to have these. Man they are big aren't they. Look like washing machines up there.
  12. skyraider

    skyraider Member

    Thanks for all the great photos. Those are some ugly spark arrestors, but a very cool motorcycle!!!!!!!!! When Joyce and I lived in Colorado we did tons of rail fanning on our motorcycle, but it wasn't as cool as that!!!!

    Paul Moore
  13. Coonskin

    Coonskin Member

    You're welcome, Paul.

    That was a very rare motorcycle. I wish I had the foresight at the time to hold on to it. In the late 1990s I was fortunate enough to obtain another Jawa 250 ISDT, this time a '73 model. It only had about 60 miles on the odo when I received it and it had the complete spare parts kit that came with a Jawa ISDT. I owned it for over a decade. I made the mistake of riding it in a 2 day vintage event in the Berkshire Mountains out of Dalton, MA in 2oo3. It was a cold, wet, Day 1. The Berkshire mud sand-papered the pristine tank sides down to the bare metal in places. I was heartsick. This eventually led to me selling it. Selling that Jawa, too, was another stupid move. Ah well.


  14. Matt Fisher

    Matt Fisher Member

    74E28C2C-B3CA-48B1-9F0F-B60527788158.jpeg My PNC (Ex-Frisco) GP7 #570 with the Spark Arrestors is complete. More photos soon once I get this locomotive back from my custom painting Guru in Florida. The fuel tank needs replaced with a larger tank and he’ll fix it before I get it home
    Last edited: Jun 17, 2022
    Joe Lovett, pensive, geep07 and 8 others like this.
  15. Matt. That looks great. My dad and I saw a bunch of those at the Precision shop. I have thought about modeling one for years. That turned out very nice.
    Ozarktraveler likes this.
  16. Matt Fisher

    Matt Fisher Member

    John has to change the fuel tank as it had a larger one. I’ll repost it once he fixes it. But otherwise I’m very happy how it came out, especially the Spark Arrestors. Thanks to all who helped with them.

  17. gstout

    gstout Member Supporter

    This is an exceptionally convincing model. Good job!

    Ozarktraveler likes this.
  18. Matt Fisher

    Matt Fisher Member

    D8ACD282-F12A-4234-AFAA-9C31C4272AEB.jpeg Updated with correct fuel tank.

    Thanks Mike for the 3D printed Spark Arrestors
  19. Looks great
    Ozarktraveler likes this.

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