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Thread: Cyl #3 bypass

  1. #1
    Paul2005GPR's Avatar
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    Cyl #3 bypass

    Any benefit to adding a pisser to the head(stock) above the third cylinder for more cooling on that cyl?

    Only found info for Riva and R&D heads, not much on the stocker


  2. #2
    Mike xsockguyx's Avatar
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    I wouldn't bother doing it to a stock head. The reason for the mod is to get more heat into the exhaust which can give you some more RPM's. Also for the high compression heads it can take pressure off the exhaust boot that attachs the u-pipe to the stinger.

  3. #3
    a lot of ski`s that are mildly modded still have the stock water routing with out issue. but if it suits your needs then...
    so far no issues with mild mods, FF exhaust, or water pressure in the coupler...
    I had a slight water leak, not really a leak more like a drip that stopped coming from the cat con housing bolt before I did the D plate...nothing so far...
    Last edited by Pale Rider; 12-18-2009 at 07:52 PM. Reason: add info...

  4. #4
    African-American
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    ideal is to T the line..
    refer to this topic for pics and info

    http://greenhulk.net/forums/showthread.php?t=80362

  5. #5
    32 Valves To Love! Racecar_Dave's Avatar
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    My mechanic dumped cyl 3 overbored on my stock head, he seems to know what he's doing, so I let him. I think it gets the pipe up to temperature faster, from a "performance" perspective.

  6. #6
    African-American
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    reduced water pressure which increases cooling of the problematic 3rd cylinder.

    and less water going into the exhaust pipe, hotter pipe, which increase performance

  7. #7
    let`s look at some of the reasons why you dump over number 3...
    I`m pretty sure it benefits the guys running larger than stock props spinning decent RPM`s which in turn cause more water pressure and flow, so you would think ski`s with these types of Mods it would be necc to alleviate some pressure in the exhaust/cat chamber coupler. This seems to be the main stream and popular mod but I`ve even seen 1390 BB ski`s run near stock cooling without any issues at max RPM all season long...
    I was even told by a top tuner that T`ing or dumping would really make no difference with my mild current mods...
    just some info... yay or nay...
    Last edited by Pale Rider; 12-18-2009 at 07:53 PM. Reason: bold...

  8. #8
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    i ran a non ported 1300 with all the trimming last season without dumping 3 and had no issues.

    i am now running the same setup but ported with more compression and there have been no issues in 4 hours of run time but i will keep an eye on it and post if i find anything worth sharing.

  9. #9
    African-American
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    im running a skat-track impeller + blueprinted old style pump, kept on rupturing the exhaust joins..

    T dumped it laster year and haven't had any issues since.

  10. #10
    JKR1300's Avatar
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    The main reason is to reduce water pressure in the engine at wide open throttle. Only required if you're running over 75. Reduces chance of water intrusion into engine

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