Page 1 of 2 1 2 LastLast
Results 1 to 10 of 12
  1. #1

    1990 Sea Doo SP 580

    does this engine fire on both compression and exhaust stroke??? thank you for the help.


  2. #2
    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
    Join Date
    Nov 2007
    Location
    Odessa, TX
    Posts
    5,364
    Quote Originally Posted by rlloyd View Post
    does this engine fire on both compression and exhaust stroke??? thank you for the help.
    Uh what do you mean? Its a two stroke engine, so every time the piston comes to the top it compresses a fuel air charge and sparks and every time it drops it exhausts spent fuel and draws in a fresh chrage.

  3. #3
    Quote Originally Posted by DarthAWM View Post
    Uh what do you mean? Its a two stroke engine, so every time the piston comes to the top it compresses a fuel air charge and sparks and every time it drops it exhausts spent fuel and draws in a fresh chrage.
    each time the piston reaches tdc on compesion stroke and tdc on exhaust stroke do the spark plugs spark on both tdc's

  4. #4
    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
    Join Date
    Nov 2007
    Location
    Odessa, TX
    Posts
    5,364
    Quote Originally Posted by rlloyd View Post
    each time the piston reaches tdc on compesion stroke and tdc on exhaust stroke do the spark plugs spark on both tdc's
    Yes but because of this it does not have a compression and exhaust stroke like a 4 cycle engine they are one in the same.

  5. #5
    i may have worded this wrong does this engine send spark to spark plugs 2 times each rpm?

  6. #6
    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
    Join Date
    Nov 2007
    Location
    Odessa, TX
    Posts
    5,364
    Quote Originally Posted by rlloyd View Post
    i may have worded this wrong does this engine send spark to spark plugs 2 times each rpm?
    I really don't know, I am almost clueless as to how the ignition modual operates

  7. #7
    96XPSS's Avatar
    Join Date
    Feb 2006
    Location
    Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
    Posts
    4,361
    I know 720's and 800's doo...so I would suspect yours does also.

  8. #8
    Myself's Avatar
    Join Date
    May 2007
    Location
    North Central Arkansas
    Posts
    2,771
    +1
    129
    Allright!..........Hands in the air.................Put..the tools down!........Walk backwards toward my voice.......

    Just kidding, the coil receives input from the CDI, which tells it when to fire. As far as I know they both fire at once. It's just that one cylinder is not in compression so nothing happens on that side.

  9. #9

    Smile

    Yes it fires every 180 deg. of crankshaft rotation they both fire since the opposite piston is at bdc it doesnt matter,makes it cheaper to run one coil,one trigger ,etc.its simpler also.JMHO>Marvin

  10. #10
    gorilla03's Avatar
    Join Date
    Sep 2006
    Location
    stevens point wi
    Posts
    3,774
    +1
    5
    Quote Originally Posted by mrjetskey View Post
    Yes it fires every 180 deg. of crankshaft rotation they both fire since the opposite piston is at bdc it doesnt matter,makes it cheaper to run one coil,one trigger ,etc.its simpler also.JMHO>Marvin
    Is that true for all seadoo two cylinders?

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. WTB: Sea Doo SP (95') Start Stop Switch ASAP
    By Hybrid AWD in forum Sea Doo Classifieds
    Replies: 3
    Last Post: 08-28-2012, 09:00 AM
  2. FS 1993 sea-doo sp
    By T-DUB in forum Sea Doo Classifieds
    Replies: 2
    Last Post: 01-17-2011, 01:00 PM
  3. WTB Sea-Doo XP 580 Y-Pipe white engine
    By TempoGT in forum Sea Doo Classifieds
    Replies: 1
    Last Post: 03-28-2010, 01:59 PM
  4. Replies: 0
    Last Post: 12-01-2009, 03:13 PM
  5. 95 Sea-Doo SP 'Mpem' Electrical Box For Sale
    By ags0702 in forum Sea Doo Classifieds
    Replies: 1
    Last Post: 05-20-2009, 05:29 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •