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  1. #1
    Will work on YOUR ski for FREE! GeoRXT's Avatar
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    15/19...or...15/18...Prop...?

    I will be adding the RR ECU and Riva S3 SC next week...So I would basically be a stage 3 I believe....Riva reccomends the 3 blade 15/18....But I've been told, and have read that the 3 blade 15/19 will be good also...Which one is best for my application and mods..?...Riva valvetrain Upgrade within 2-3 weeks also...

    Quick question on that, does the valvetrain upgrade give more hp or acceleration by the way?... Since the head might come off, should I consider the RR cam sprocket...?


  2. #2
    suck my wake's Avatar
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    GEO I have been asking the same Q's and from what I have found 1) the 15/19 is best for top speed with the stage 3 and the valve train upgrade will not add additional top speed or HP its just a saftey measure to allow you to run higher rpm's without floating your valves. Its a tough nut to chew @ 600.00 not to add any power but it sure is cheaper than rebuilding your motor cause you didnt have it

  3. #3

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    the valve train up grade does'nt give any increases in accel or top end its just a safeguard against valve bouncing because of your increased revs. if you buy the valve tool you dont have to remove the head, by the way i would go with the 15/19 3 blade

  4. #4
    Site Admin Green Hulk's Avatar
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    Geo, go for the 15/19R and don't look back!

    On the valvetrain upgrade...... so said it doesn't add HP, but i can almost swear i feel a difference in acceleration. Lighter valvetrain = faster revving = faster acceleration??? I have felt this difference on 3 different skis now.

    Same principle with the Rotax Racing lightweight camchain sprocket. It reduces rotating mass/weight which allows for faster revving = better acceleration.
    Last edited by Green Hulk; 04-17-2007 at 10:46 AM.

  5. #5
    Will work on YOUR ski for FREE! GeoRXT's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Geo, go for the 15/19R and don't look back!

    On the valvetrain upgrade...... so said it doesn't add HP, but i can almost swear i feel a difference in acceleration. Lighter valvetrain = faster revving = faster acceleration??? I have felt this difference on 3 different skis now.

    Same principle with the Rotax Racing lightweight camchain sprocket. It reduces rotating mass/weight which allows for faster revving = better acceleration.
    So for $80 more I can have that RR light cam sprocket....Every little bit helps I guess....


    Not that I think I'll be able to do it mysef, but anyone have the tool and is willing to rent...? Or is it real easy to do? Cuz if the head comes off i will beed a new gasket right? Which costs how much?

  6. #6

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    Geo, i have rr ecu and 3s suppercharger on my rxt, and run in the same heat you do. I think that 15/19 is going to be hard to turn, i have the 15/18 and turn 8400 to 8500 rpm max, and its going to get hotter soon.

    ron

  7. #7
    xenonx's Avatar
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    Geo, you don't need to remove the head to replace the cam sprocket.
    You can remove the valve cover and cam end cover, loosen the cam chain tensioner, and remove the cam sprocket. Put new RR cam sprocket in and reverse order to button up. Make sure you don't rotate the crank or cam and your timing should be good. The sprocket is slotted like the stock cam sprocket so you can adjust cam timing. Refer to Jerry for a starting point with your setup.

  8. #8
    xenonx's Avatar
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    You do have to remove the head to put in the RR oil jet on the 04/05 engines though. I sure hope that the time and effort to remove and reassemble along with the cost of a new head gasket is worth installing that $40 oil jet.

  9. #9
    Site Admin Green Hulk's Avatar
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    Unless you are a racer and are constantly at WOT then don't even worry about the oil jet.

  10. #10

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    Quote Originally Posted by 4rsnow View Post
    Geo, i have rr ecu and 3s suppercharger on my rxt, and run in the same heat you do. I think that 15/19 is going to be hard to turn, i have the 15/18 and turn 8400 to 8500 rpm max, and its going to get hotter soon.

    ron
    Geo, do what Ron says, this is way i bought the smaller 15/18 instead of the taller 15/19, just look what happened to board member (Boosted) from Aruba when he put the Riva 15/19 to his moded stage RXP with the Riva S3 SC, he couln't spin this prop over 7900 rpms.., he ride in SALT water and in our same mid 80 to low 90 deg weather conditions, in my opinion this taller 15/19 skat prop work good for skis running in less denser FRESH water and in cooler mid 60 to low 70 deg air.

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