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  1. #1

    1050/700 Domes - which is which

    I'm at a bit of a dilemma here. I'm putting my 900 back together as a 1050 as well as rebuilding the $500 '96 sltx I bought last summer.


    The 900-1050 is using stock bore 009 cylinders. I used two good ones from the sltx and a 3rd from ebay. All stock cylinders with stock pistons. The sltx originally had 3022034 domes. The ebay 009 came with a 3022050 dome.


    The SLTX is getting 009 jugs that are freshly bored .5 over with new pistons.


    Currently in my inventory I have the following domes:
    3022034 - x2
    3022050 - x2
    3022025 - x7


    I'm trying to figure out what would be the best way to outfit both 1050s using the domes I have.

    I've read where the '97 1050 used and 025 in the center and 050 on mag and PTO to help manage detonation. I don't fully understand why that was only on the '97. If I'm using a later crank and updated ignition, would it hurt do dot that on mine?

    Could I use two 050s and an 025 on one and the two 034 and an 025 on the other? Or should I just try to source another 034 and 050 and use a matching set on both?


  2. #2
    PolarisNut's Avatar
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    Quote Originally Posted by bgaidan View Post
    I'm at a bit of a dilemma here. I'm putting my 900 back together as a 1050 as well as rebuilding the $500 '96 sltx I bought last summer.


    The 900-1050 is using stock bore 009 cylinders. I used two good ones from the sltx and a 3rd from ebay. All stock cylinders with stock pistons. The sltx originally had 3022034 domes. The ebay 009 came with a 3022050 dome.


    The SLTX is getting 009 jugs that are freshly bored .5 over with new pistons.


    Currently in my inventory I have the following domes:
    3022034 - x2
    3022050 - x2
    3022025 - x7


    I'm trying to figure out what would be the best way to outfit both 1050s using the domes I have.

    I've read where the '97 1050 used and 025 in the center and 050 on mag and PTO to help manage detonation. I don't fully understand why that was only on the '97. If I'm using a later crank and updated ignition, would it hurt do dot that on mine?

    Could I use two 050s and an 025 on one and the two 034 and an 025 on the other? Or should I just try to source another 034 and 050 and use a matching set on both?
    The 050s are the smaller volume I believe. I'd use 3 of those if it were me. If you only have two, then set it up like the 97 1050. Adjust your water outlet manifold to the same size as the 1200s, and remove the thermostat and pop off valve.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by bgaidan View Post
    ...I've read where the '97 1050 used and 025 in the center and 050 on mag and PTO to help manage detonation.

    I don't fully understand why that was only on the '97.

    If I'm using a later crank and updated ignition, would it hurt to do that on mine?...
    Speculation on my part, but according to the Polaris parts cross reference the 1260809 exhaust manifold was used in 1997, but not 1998

    1260809 manifold was used again in 1999 onwards, on the 1200 engine.

    I think 1998 used the 2200948 exhaust manifold, or the 2200948 was a retrofit/upgrade for the 1996-1999 engines

    A different exhaust manifold may flow differently for the center cylinder, which could affect cylinder+piston internal temperatures.

  4. #4
    Quote Originally Posted by K447 View Post
    Speculation on my part, but according to the Polaris parts cross reference the 1260809 exhaust manifold was used in 1997, but not 1998

    1260809 manifold was used again in 1999 onwards, on the 1200 engine.

    I think 1998 used the 2200948 exhaust manifold, or the 2200948 was a retrofit/upgrade for the 1996-1999 engines

    A different exhaust manifold may flow differently for the center cylinder, which could affect cylinder+piston internal temperatures.

    I didn't even think of the manifold being different. Good call.

    Looks like the '96 sltx should have the 2200948. And the 900 shows the same part number too. What's weird too is that the '97 SLTX shows the 809 manifold like you said, but the '97 SL150 apparently used the 948.


    I set it up like a '97 just for kicks, and to get the cylinders covered up so I could drop the engine in and get it aligned. I quick bench compression test showed 118 118 120 (the two at 118 being the originals and the 120 the newer ebay replacement) so it would seem compression is ok with that particular setup.

    I could understand the cooling manifolds affecting temps differently on each cylinder, but I still don't fully get why they used different domes....and only on that one year.


    I need to check my stash too. I very well may have an 809 manifold in one of my boxes.....but I may need that for the 1200 too.

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by bgaidan View Post
    I didn't even think of the manifold being different.

    ...I could understand the cooling manifolds affecting temps differently on each cylinder, but I still don't fully get why they used different domes....and only on that one year...
    I was referring to exhaust gas flow being different for the center cylinder, not the cooling water flow (although that could also differ between manifolds).

    If the exhaust manifold was causing the center cylinder to run hotter, or leaner, then a different head design can reduce compression slightly, thereby evening out the cylinder and piston temperatures across all three.

    I am not highly familiar with the various manifolds used on those years, but I suspect that the combination of manifold and heads was selected for engine durability reasons.

    For example, on the 1200 engines with the log pipe, Polaris revised the exhaust manifold several times, in part to correct an issue with the exhaust flow pattern causing piston damage under certain operating conditions.

    IIRC, the post 2002 log pipe has an extra 'lip' inside the exhaust manifold to deflect exhaust flow away from the 'downstream' cylinder ports.

    1261259-329 (2003-2004)
    1261125-329 (2002)
    1261125 (2001)
    1260850 (1999-2000)

  6. #6
    Quote Originally Posted by K447 View Post
    I was referring to exhaust gas flow being different for the center cylinder, not the cooling water flow (although that could also differ between manifolds).

    If the exhaust manifold was causing the center cylinder to run hotter, or leaner, then a different head design can reduce compression slightly, thereby evening out the cylinder and piston temperatures across all three.

    I am not highly familiar with the various manifolds used on those years, but I suspect that the combination of manifold and heads was selected for engine durability reasons.

    For example, on the 1200 engines with the log pipe, Polaris revised the exhaust manifold several times, in part to correct an issue with the exhaust flow pattern causing piston damage under certain operating conditions.

    IIRC, the post 2002 log pipe has an extra 'lip' inside the exhaust manifold to deflect exhaust flow away from the 'downstream' cylinder ports.

    1261259-329 (2003-2004)
    1261125-329 (2002)
    1261125 (2001)
    1260850 (1999-2000)
    Ahh, gotcha. I did the compression test without the manifold installed so that could easily skew my results. Although if the 948 manifold is the same on all three, I guess it really wouldn't affect them.

    The engine's in and aligned and hopefully I'll have everything else buttoned up by next weekend. And will be able to give it a little better test. I can always go back and swap domes if there's a problem. I'm not going to lose another engine (or two) over a $30 dome or exhaust manifold.


    Not that I'm in a huge hurry. It's only been in the 20's and 30's here for the past couple of weeks. I don't expect to be on the lake any time soon. Although I do think I'll have both the SL900/1050 and the SLTX ready to at least trailer test within the next few weeks.



    This all makes more sense now that I think about it. Years ago, on the other site, I remember someone saying they thought the exhaust was different between the 900 and 1050. I took that to mean the pipe, but it looks like that at least in '96, everything was identical. The only change being the '97 manifold.

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