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    Polaris centurion 500

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    16 replies
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    • Member since
      September, 2011
    Polaris centurion 500
    Posted by cbchom on Saturday, February 25, 2012 10:01 AM

    Hi, I got a old centurion 500 drag racer, I'am looking to restore it but woulds like to get more out of the  motor, if anyone as any info on how to wake them up would be really appreciate.

     

    Thanks

    • Member since
      July, 2005
    • From: Anchor Bay MI
    Posted by chines on Saturday, February 25, 2012 2:26 PM

    Triple pipes and 38mm carbs from a 340 liquid motor along with cleaning up the stock porting .Get the cranking compression to 165 and run some more octane (95-100). And of course some modern clutching.Use a later model p85 primary and secondary. Engage at 6000 and run the motor at 10,000. If you have the $ replace the pto bearings on the crank and have it trued and welded.

    Self proclaimed President, Southeastern Muskamoot Bay Drag Racing Association. 5 members, and a few more that I'm considering.no dues. God bless the second amendment and thank god for the fifth.

    Any engineer can design an a-s-shole, they need an operator to make it s-hit!

    • Member since
      September, 2011
    Posted by cbchom on Saturday, February 25, 2012 6:39 PM

    Thanks,   it's already on triple pipe ( look like aaen)  I think the sled has been a racer since new.  Any spec on port/transfer height to get it turning at 10k?  how much hp could I get?  who would be the best guy to rebuild the motor?

     

    Thanks again

    • Member since
      July, 2005
    • From: Lower Michigan
    Posted by MiModRacer on Sunday, February 26, 2012 9:01 AM

    There was a place called The Sled Stop ( I think) try googleing it, that had a pretty stout PS 500 Centurion.  I'm not sure what all they did to it.  With modern technology you can 3x port the exhaust & probably find a brain box with a much better timing curve then they had back then.  Its all about the $$ you are willing to spend. Good Luck with your project. MMR

    • Member since
      July, 2005
    • From: Anchor Bay MI
    Posted by chines on Sunday, February 26, 2012 10:00 AM

    The 500 was a pretty durable motor but parts are getting hard to find,so make sure you have them on hand before sending the engine anywhere. Super easy to work on.Don't lose or remove the cork plugs in the crankholes. A lot of the same porting that were run on the 340 indys work for the 500. You already have pipes.so you need to build the engine to work with your pipes and run it at that rpm. The carbs need to be bigger.The ignition system is the same as the early 600/650.

    Self proclaimed President, Southeastern Muskamoot Bay Drag Racing Association. 5 members, and a few more that I'm considering.no dues. God bless the second amendment and thank god for the fifth.

    Any engineer can design an a-s-shole, they need an operator to make it s-hit!

    • Member since
      February, 2006
    Posted by racerdad87 on Sunday, April 15, 2012 1:25 PM

    you can go to hobby lobby for the cork

    • Member since
      November, 2013
    Posted by weeman72 on Tuesday, November 05, 2013 11:27 PM

    hey im just wondering I picked up a 1981 polaris indy 500 triple centurion and pulled the motor from it to use in my mod drag chassis and was wondering what clutch setup to use on it??.......im using a comet 108c clutch and was wondering about what weights to run in it and what clutch spring to use to make it really perform in the drags?? im installing 38mm triple carbs on it and a set of psi triple pipes from an older 1986 indy 600 triple.........ive heard to have the sled engage at 6500 rpm but was wondering how to get it to engage that high?? any help with any information about it would really help thanks

    • Member since
      July, 2005
    • From: Anchor Bay MI
    Posted by chines on Wednesday, November 06, 2013 8:54 AM

    You can use Polaris weights and springs in the Comet.The weights will be in the 40 gram area depending on the spring you use.The weights will either need to be tucked or an engagement notch added.The hard part is finding a spring that will give high enough engagement and still be able to shift fully out with the light weights.That particular engine will respond to nearly the same clutching that the 340 indy used.The engagement needs to be about 6500 for drags and shoot for 10,000 rpm operating.It's all in the clutching to get that motor to leave hard and pull hard.

    Self proclaimed President, Southeastern Muskamoot Bay Drag Racing Association. 5 members, and a few more that I'm considering.no dues. God bless the second amendment and thank god for the fifth.

    Any engineer can design an a-s-shole, they need an operator to make it s-hit!

    • Member since
      November, 2013
    Posted by weeman72 on Wednesday, November 06, 2013 3:11 PM

    well right now the weights that are in the clutch have an F stamped on it and I found a clutch spring that's a 250/450 on a tag on it how will that be?? what would be the engagement of that spring??

    • Member since
      July, 2005
    • From: Anchor Bay MI
    Posted by chines on Friday, November 08, 2013 9:15 AM

    250-450 no way.What is the weight of the f weight?

    Self proclaimed President, Southeastern Muskamoot Bay Drag Racing Association. 5 members, and a few more that I'm considering.no dues. God bless the second amendment and thank god for the fifth.

    Any engineer can design an a-s-shole, they need an operator to make it s-hit!

    • Member since
      November, 2013
    Posted by weeman72 on Sunday, November 10, 2013 11:25 AM

    I got the clutching figured out now but im trying to hook up a polaris 6 pulse tach from a newer polaris edge sled into the centurion motor but don't know which wires to hook them into?? whether the centurion uses a 3 pulse?? or 6 pulse I don't know any help would be greatly apprechiated......thanks for your help on the clutching chines

    • Member since
      July, 2005
    • From: Anchor Bay MI
    Posted by chines on Sunday, November 10, 2013 5:16 PM

    I believe the tach was a 3 pulse.

    Self proclaimed President, Southeastern Muskamoot Bay Drag Racing Association. 5 members, and a few more that I'm considering.no dues. God bless the second amendment and thank god for the fifth.

    Any engineer can design an a-s-shole, they need an operator to make it s-hit!

    • Member since
      November, 2012
    Posted by Arctic Cat Z on Wednesday, November 13, 2013 1:48 AM
    The old Polaris triples are 3 pulse
    • Member since
      November, 2013
    Posted by weeman72 on Saturday, November 16, 2013 9:08 PM

    I need help trying to hook up a newer 6 pulse polaris tach to the older centurion 500 motor wireing?? can anyone help me?? also what wires do I hook the killswitch wires into?? its just two wires that come from the killswitch but I don't know where those two wires go to?? let me know if anyone can help??

    • Member since
      November, 2013
    Posted by weeman72 on Saturday, November 16, 2013 9:08 PM

    I need help trying to hook up a newer 6 pulse polaris tach to the older centurion 500 motor wireing?? can anyone help me?? also what wires do I hook the killswitch wires into?? its just two wires that come from the killswitch but I don't know where those two wires go to?? let me know if anyone can help??

    • Member since
      November, 2012
    Posted by Arctic Cat Z on Sunday, November 17, 2013 5:21 AM

    You need to get a 3 pulse tach for that engine...or invest in a vdo tach or similar.  The six pulse factory tach will read twice as fast no matter how you wire it.  I don't know of any way to make that work properly for you.

    • Member since
      November, 2013
    Posted by weeman72 on Monday, November 18, 2013 11:04 PM

    ok for a 3 pulse tach what wires do you hook into to make it work??

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