Page 1 of 2 1 2 LastLast
Results 1 to 10 of 17
  1. #1
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85

    GPRXP conversion Vent system.

    The first two GPRXP's were hooked up with both in and out vents located to outside of hull. There have been a few strange issues with fouled plugs, overflowing oil vent bottle with lots of white gas/water/oil liquid. Oil purity being diluted within 10 hours. Finally, after the Vigilante sat idle for a while, it stopped running. I set Jerry's gprxp up using the stock gpr system, so his is uneffected.

    Upon inspection, water was found on the plugs, as well as a white deposition on the plugs. Water was found in the gas tank. After 15 gallons were removed, nearly a half a quart of water was poured off the bottom of the tank.

    Root cause: the vent system "in-valve" was sucking in both moisture as well as outside water. Upon dissasembly, water poured out of the vent system.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	MKC_6365.jpg 
Views:	230 
Size:	219.5 KB 
ID:	32936   Click image for larger version. 

Name:	MKC_6367.jpg 
Views:	262 
Size:	399.7 KB 
ID:	32937   Click image for larger version. 

Name:	MKC_6369.jpg 
Views:	269 
Size:	39.0 KB 
ID:	32938   Click image for larger version. 

Name:	MKC_6370.jpg 
Views:	429 
Size:	158.8 KB 
ID:	32939  


  2. #2
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    Location
    League City, Texas
    Posts
    16,066
    +1
    23
    Very good find !

  3. #3
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    Better late than never. I should have caught it earlier. Big screw up on my part.

  4. #4
    My son (mohawk man) jeffsntx's Avatar
    Join Date
    Sep 2006
    Location
    Belton TX
    Posts
    2,598
    +1
    1
    Quote Originally Posted by Hydrotoys View Post
    Better late than never. I should have caught it earlier. Big screw up on my part.
    Mark, I would say that y'all are still in the early stages of the "conversion game". There may be other small "speed bumps" along the way.

    Good catch

  5. #5
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    I think we are just about done with the stock hickups. We had a waterbox issue, the vent fun stuff, the air intake stuff, the driveshaft bracket leak, and some fun with battery mounting. Actually STILL having fun with battery mounting.

    Everything after that is pump related, and with the massive low end torque of these engines, getting the power to the water is a huge issue.

  6. #6
    Moderator Insanediego Joe's Avatar
    Join Date
    Mar 2006
    Location
    San Diego, California, United States
    Posts
    5,885
    +1
    142
    draining my tank tonight. Thanks for the pics and the heads up. no wonder the spitfire has been fouling plugs and generally running like shit but still able to obtain 80 mph locked down to the water!

  7. #7
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    Joe,
    Sorry we didn't use the Yami system. I think once we gutted it for painting, and got in a rush to gear it up, I think this took back seat to any thought.

    Since you are using the Riva IC, that would be another item to keep an eye on. Have you taken the water lines off, and pressure tested the water jacket? Do it like a triple pipers water jacket, and it will be more accurate than "looking for air bubbles." Prob 50psi.

  8. #8
    Moderator Insanediego Joe's Avatar
    Join Date
    Mar 2006
    Location
    San Diego, California, United States
    Posts
    5,885
    +1
    142
    Took about a 1/2 gallon out of the spitfire. couldnt see any water but some nasty looking brown crud from the bottom of the tank was spit out. I think its sand. Last time running bouys it fouled a plug, removed plug and it looked like hydroys picture but there was a speck of sand on the electrode. I think the ski burned off most of the water in the tank and all that was left was salt or sand. makes since the ski ran like crap for a good 20 minutes and slowly cleared up to run pretty damn good.

    Hydro your making these fixes way to easy. Ill post up my pics when my battery for the camera charges.

  9. #9
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    Joe,
    Consider mixing up some salt water, and putting a small amount in some fresh gas, and see what color it turns after a few minutes.

  10. #10
    Moderator Insanediego Joe's Avatar
    Join Date
    Mar 2006
    Location
    San Diego, California, United States
    Posts
    5,885
    +1
    142
    Quote Originally Posted by Hydrotoys View Post
    Joe,
    Sorry we didn't use the Yami system. I think once we gutted it for painting, and got in a rush to gear it up, I think this took back seat to any thought.

    Since you are using the Riva IC, that would be another item to keep an eye on. Have you taken the water lines off, and pressure tested the water jacket? Do it like a triple pipers water jacket, and it will be more accurate than "looking for air bubbles." Prob 50psi.
    Nothing to be sorry about. Your on the cutting edge here. "shit Happens"

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. Hydrojunkie's Gprxp Conversion
    By hydrojunkie in forum Conversion PWC Performance Skis
    Replies: 296
    Last Post: 09-07-2009, 06:39 PM
  2. GPRXP Conversion Shimming Database
    By JFizzleJR in forum Conversion PWC Performance Skis
    Replies: 5
    Last Post: 08-10-2008, 09:43 PM
  3. Jeffsntx's GPRXP conversion
    By jeffsntx in forum Conversion PWC Performance Skis
    Replies: 143
    Last Post: 06-22-2008, 03:24 PM
  4. GPRXP Conversion project
    By idizzy in forum Conversion Skis Classifieds
    Replies: 19
    Last Post: 02-01-2008, 10:57 PM
  5. Fuel tank vent system
    By novanuttz in forum Polaris Open Discussion
    Replies: 3
    Last Post: 04-24-2007, 12:24 AM

Posting Permissions

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