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S & S carb ThunderJet valve.

Discussion in 'Motorcycle Tech Talk' started by Tommyc, Mar 18, 2011.

  1. Tommyc

    Tommyc Active Member

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    Does anyone out there have any experience with the ThunderJet?
    I am thinking about getting one if they increase HP and torque and are worth the money.
    Let me know about your experience with it.
    Thanks guys,
    Tommyc
    Tommyc, Mar 18, 2011
    #1
  3. hotroadking

    hotroadking Super Moderator Staff Member

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    You talking about putting one on your Super E/G?

    Yes they do work, the SNS carbs have two fuel circuits and this adds a third which helps with the transition points on the carb.

    Before it's pilot to Main and to have enough fuel on WOT the main
    had to be larger than needed, so when you put on the T-Jet
    you can run a slightly smaller Main allowing the T-Jet to add the fuel
    during that point and more all the way to WOT.
    hotroadking, Mar 18, 2011
    #2
  4. Tommyc

    Tommyc Active Member

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    Yes, I am thinking aout putting on my 93 ci shovel with a super E.
    I have it set-up in single fire mode with 2 coils and 4 plugs. She runs great. I'm always trying to improve performance. I'm thinking about adding the TJ and a K&N tall air filter and a set of thundercity baffles in my 2" open drags. Should feel a improvment with those adds, ya think?
    So do you think the TJ is worth the money?
    Next question: what would you say the redline limit for a hi-po shovelhead motor is? I'm thinking about 6,000 rpm.
    Thanks!
    Tommyc, Mar 18, 2011
    #3
  5. hotroadking

    hotroadking Super Moderator Staff Member

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    15 schnitzenglubens be my limit LOL

    I wouldn't push over 6K

    It won't hurt and you can play with it as they have
    changeable jets to set the amount of fuel it adds,

    Some folks drill the hole on the side where the vac
    created the timing when it comes in, I would leave
    it alone from that stand point. Some guys
    with big engines run two tjets.

    It should smooth out the transistion and allow you
    to better tune the engine with three fuel circuits.
    hotroadking, Mar 18, 2011
    #4
  6. Tommyc

    Tommyc Active Member

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    I'm gonna check into it at my local Harley race shop. It's called diry white boy racing. Big Harley's only! I will let you know how it goes.
    Thanks.
    Tommyc, Mar 18, 2011
    #5
  7. hotroadking

    hotroadking Super Moderator Staff Member

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    Best Race engine and street guy in SoFL is John Sachs, he is the king pooh bah of high performance in FL...
    hotroadking, Mar 18, 2011
    #6
  8. Tommyc

    Tommyc Active Member

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    I will look him up, thanks!!
    Tommyc, Mar 18, 2011
    #7
  9. Tommyc

    Tommyc Active Member

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    Road King:
    I am thinking about adding thunder city baffles to my open 2" drag pipes, good idea or no?
    They cost $130
    Tommyc, Mar 18, 2011
    #8
  10. hotroadking

    hotroadking Super Moderator Staff Member

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    Yes and no

    Drag pipes kill power on the street, sound loud, but basically they
    reduce lower end TQ for higher end HP, and on a harley that's the opposite
    of what you want on a street bike.

    Will they help, maybe, but any baffle will help those pipes
    I would look for a set of baffles to put in, wrapped with fiberglass
    and maybe put the lollypop trick in the bolt (that's a flat washer with hole in the middle
    welded to the end of a threaded rod then nutted inside and out) to create backpressure.

    I'll send you Johns number he does SNS carbs can put the tjet in and knows how
    to setup the carb...
    hotroadking, Mar 18, 2011
    #9
  11. Tommyc

    Tommyc Active Member

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    Thanks, I know about the lollipop trick.
    So you would do baffles and lollipop?

    Attached is a couple of pics of the bike in question. They're a little dark but you get the feel for what's going on with it.

    Thanks for your advice.!

    Attached Files:

    Tommyc, Mar 18, 2011
    #10
  12. hotroadking

    hotroadking Super Moderator Staff Member

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    bike looks good, the lolly pop will help more than anything

    Best thing is to dump the drags and go to a stock header with
    a cycle shack or khrome werks slip on...

    YOur ears will thank you as will everyone you ride with
    and you engine will work better...
    hotroadking, Mar 18, 2011
    #11
  13. Tommyc

    Tommyc Active Member

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    like a 2 into 1 header?
    Tommyc, Mar 18, 2011
    #12

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