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  1. #1

    Thumbs up New 4" Air Intake results

    Well I finally got the Speedster out of storage and pulled the SC to get metal washers put in. What a pain bending my fat ass over down in the engine compartment. I got the SC back in and realized I only had about half the parts I would need to build the 4” intake.
    Here is the final list for those interested. All parts are available from Spectre performance on the web. I got most of mine from Jegs.com except the 90 degree 4-3” reducer came from Silicone Intakes.
    Starting at the SC:
    90 degree 4”-3” Reducer-------------------------$20.00
    22 degree 4” alum. Elbow Pt#9729--------------$17.00
    4” silicone coupling (9776) ----------------------$12.00
    90 degree 4” elbow (979 ----------------------$23.00
    4” silicone coupling (9776) ----------------------$12.00
    22 degree 4” alum. Elbow (9729) ---------------$17.00
    Spectre filter (9737) -----------------------------$41.00
    3” Duct adapter (8147) goes in end of filter--------$6.00
    3 feet of 3” Air duct (8746) ----------------------$10.00
    3” Duct adapter (8147) ---------------------------$6.00

    Total---$174.00

    I pulled the Seadoo hose at the SC and the molded plastic 3’ piece.. I then hooked up the last adapter to the rubber hose left hanging below the air box and connected the ducting. It allows me to keep the existing crankcase ventilation system.

    Results: Stock prop, and the water was cold-55degrees which could skew these results.
    Before, boat would run 7840-7860 rpms but it would take a little time to get there.
    After, Rpms shot right to 8140-8160 I don’t know if the rev limiter was the limiting factor or not.
    Speed, Before: 1 person 57-59mph (boat speedo)
    After: 1 person 59-60mph (boat speedo)

    Acceleration was noticeable improved. Noise was not noticeable louder. With 2 people the boat would hold a steady 57mph. Like I said before though, the water was only 55 degrees.
    Was it worth it? Yeah I guess so, beside it looks good.


  2. #2
    Quote Originally Posted by Mike E View Post
    Well I finally got the Speedster out of storage and pulled the SC to get metal washers put in. What a pain bending my fat ass over down in the engine compartment. I got the SC back in and realized I only had about half the parts I would need to build the 4” intake.
    Here is the final list for those interested. All parts are available from Spectre performance on the web. I got most of mine from Jegs.com except the 90 degree 4-3” reducer came from Silicone Intakes.
    Starting at the SC:
    90 degree 4”-3” Reducer-------------------------$20.00
    22 degree 4” alum. Elbow Pt#9729--------------$17.00
    4” silicone coupling (9776) ----------------------$12.00
    90 degree 4” elbow (979 ----------------------$23.00
    4” silicone coupling (9776) ----------------------$12.00
    22 degree 4” alum. Elbow (9729) ---------------$17.00
    Spectre filter (9737) -----------------------------$41.00
    3” Duct adapter (8147) goes in end of filter--------$6.00
    3 feet of 3” Air duct (8746) ----------------------$10.00
    3” Duct adapter (8147) ---------------------------$6.00

    Total---$174.00

    I pulled the Seadoo hose at the SC and the molded plastic 3’ piece.. I then hooked up the last adapter to the rubber hose left hanging below the air box and connected the ducting. It allows me to keep the existing crankcase ventilation system.

    Results: Stock prop, and the water was cold-55degrees which could skew these results.
    Before, boat would run 7840-7860 rpms but it would take a little time to get there.
    After, Rpms shot right to 8140-8160 I don’t know if the rev limiter was the limiting factor or not.
    Speed, Before: 1 person 57-59mph (boat speedo)
    After: 1 person 59-60mph (boat speedo)

    Acceleration was noticeable improved. Noise was not noticeable louder. With 2 people the boat would hold a steady 57mph. Like I said before though, the water was only 55 degrees.
    Was it worth it? Yeah I guess so, beside it looks good.

    IT΄S INDEED A PAIN IN THE ASS AND IN THE BACK, I HAD BACKPAIN OVER 1 WEEK AFTER MODDING
    NICE RESULTS

  3. #3

    Join Date
    Apr 2007
    Location
    Vancouver, BC
    Posts
    204
    what did you do with the crackcase ventilation line?

  4. #4
    Quote Originally Posted by vwDavid View Post
    what did you do with the crackcase ventilation line?
    I bought a adapter and hose(blue 3" hose in picture) that plugs into the center of the filter. Ran the hose over to the air box and hooked up to the existing fitting. That way I use the existing CCV and no need to move rectifier because it is still sucking air from the stock box. Granted not a lot of air but no problems so far. Its in the material listing.

    Mike
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  5. #5

    Join Date
    Apr 2007
    Location
    Vancouver, BC
    Posts
    204

    reducing elbow, where?

    Does anyone know another place to get the 3-4" reducing elbow. silicone intakes.com is out of stock, I've tried Jegs, ebay, google, can't find anywhere (priced similarly to silicone intakes.)

    thx

  6. #6
    My new toys at work bruinsrme's Avatar
    Join Date
    Jul 2007
    Location
    Worcester MA
    Posts
    1,706
    Quote Originally Posted by vwDavid View Post
    Does anyone know another place to get the 3-4" reducing elbow. silicone intakes.com is out of stock, I've tried Jegs, ebay, google, can't find anywhere (priced similarly to silicone intakes.)

    thx
    here you go
    http://www.greenhulk.net/forums/show...ghlight=degree

  7. #7

    Join Date
    Apr 2007
    Location
    Vancouver, BC
    Posts
    204
    thanks, he is selling a 45 degree, not a 90 degree. I think I need a 90 degree

  8. #8

    Join Date
    Mar 2007
    Location
    Cairns Australia
    Posts
    234
    Looks good Mike E, its a pity you could'nt have had a one piece mandrel bent polished tube from the silicon elbow to the filter though.

    Cheers

    Chris.

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