3.5 outboard pipe

Discussion in 'Outboard Forum' started by ChrisHerzog, Sep 7, 2019.

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  1. Sep 7, 2019 #1

    ChrisHerzog

    ChrisHerzog

    ChrisHerzog

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    What other options are out there in the way of a tune pipe for a new Novarossi 3.5 O/B other then the carbon fiber route?

    Thanks
    Chris
     
  2. Sep 7, 2019 #2

    topfuel443

    topfuel443

    topfuel443

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    Chris, the Hopper Silver Bullet pipes are available. Otherwise, that’s pretty much it unless you find something used
     
  3. Sep 7, 2019 #3

    Joern Markset

    Joern Markset

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  4. Sep 7, 2019 #4

    ChrisHerzog

    ChrisHerzog

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    I like the car pipes but always thought that they were designed for torque and not really for rpm.

    Are many guys running the Novarossi car pipe?
     
  5. Sep 8, 2019 #5

    Kris Flynn

    Kris Flynn

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    I have not tested car pipes...but only guys in europe amd japan use car pipes. They tend to run on smaller course size and need/want the down low over top end.

    Pretty sure there are some VERY fast 20 boats using car pipes in Japan at least!
     
  6. Sep 8, 2019 #6

    RobertDoak

    RobertDoak

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    Im running an OFNA pipe....and like it
     

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  7. Sep 8, 2019 #7

    Joern Markset

    Joern Markset

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    I am running car pipes, pulling 41500 rpm. You will need to shorten the header, and go for the conical headers.
    either you rebuild an onroad header, or you pick up this one from Hipex: http://www.hipex.it/en/products/manifolds/marine/product/view/17/28
    Even that one can be shortened a little.
    Remember the marine engines are mostly based on the onroad engines.
    I`m running OS Speed R2103 car engine, and it works great.
     
    Kris Flynn likes this.
  8. Sep 9, 2019 #8

    Grimracer

    Grimracer

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    Silver bullet..

    Grim
     
  9. Sep 9, 2019 #9

    Alan Elzer

    Alan Elzer

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    I've got equi & Irwin 21 outb pipes.
     
  10. Sep 10, 2019 #10

    shoboat

    shoboat

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    Joern,

    What size of propellers are you pulling at 41,500 rpm?
    Not many motors pulling that many rpm fully loaded.
    The O.S. motors are really nice inside.

    Thanks,

    Mark Sholund
     
  11. Sep 10, 2019 #11

    Joern Markset

    Joern Markset

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    Mark, we are pulling very small props, like Octura Y537/3 and X440/3
    Also we are running 25% nitro, and geared. Thats how I can use the car engines for outboard without modification.
    Yes, I just love those OS engines.
    Today I got a delivery of the new R2104 engines. Looking forward to see if there is any increase in power compared to the R2103.
     
    Kris Flynn likes this.

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