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  1. #1
    flyin' the friendly skies airbornexp's Avatar
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    04 vs newer Sportster

    im looking at an 04 sportster with the 155hp 4 tec. is this the same platform as the 215hp/ 255hp motor? Same platform I mean that is the motor the same size? pistons and all? Whats the differnce? S/C?
    Thanks all


  2. #2
    EZ Dock of Long Island Shibby1485's Avatar
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    same basic powerplant and technology.. yes

    same exact components? no.... same bore, same stroke, same everything.... various camshafts, various compression ratios from pistons, and several other very minor differences...

    the 155 is built for NA... higher compression cast pistons

    the supercharged units are lower compression forged pistons


    ur getting the same block, same crank, same rods, same bearings, technology, etc.... but all different variations in HP derived from cams, pistons, superchargers, ECUs, etc

  3. #3
    flyin' the friendly skies airbornexp's Avatar
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    so basically i cant throw a S/C on it and call it good...thats what I was wanting to know if i could or not to get the HP. This boat was at a farm auction today and was thinking about bidding on it if i could.

  4. #4
    EZ Dock of Long Island Shibby1485's Avatar
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    yea u def can't do that....

    you would need pistons, overdrive gears, cam, exhaust valves, pto cover, ecu plus a supercharger just to list the major ones...

    not cheap parts by any means, it would be a pretty involved conversion, would have to pull the entire motor apart and rebuild.

    how cheap did it sell for at the auction? if the price was right you coulda cheaply pulled off the supercharger conversion with some fenagling of deals on the board

  5. #5
    flyin' the friendly skies airbornexp's Avatar
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    $6,000 is what he got it for.

  6. #6
    flyin' the friendly skies airbornexp's Avatar
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    im a noob in the 4 tec world....so what are some easy/cheap mods for the 155 4-tec?

  7. #7

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    Quote Originally Posted by airbornexp View Post
    im a noob in the 4 tec world....so what are some easy/cheap mods for the 155 4-tec?

    A nice intake and mabey a resonator bypass.

    I would then work on the pump, new grate, new impeller..

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