Results 1 to 16 of 16

Thread: dual water pump pulley?

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Join Date
    Jan 2002
    Location
    Sayre PA USA 45 Miles from Watkins Glen
    Posts
    814

    Question dual water pump pulley?

    In view of recent fan belt failure looking to upgrade to dual belt pulleys! Racing beat has the drive pulley and alternator in dual belt configuration but I haven't found a competition water pump pulley for 2 belts? any info appreciated. Thanks Tom Weaver
    Tom Weaver: Logistics & Technical Support Manager IE truck driver for 1986 RX-7 ITS #63. "Diesel Haulin' Rotary" 2005 Dodge 2500 Quad Cab The Hemi has retired "Long Live the Hemi" Bill Weaver Driver- 2004 NYSRRC John Chave Award. 2006 & 2013 ITS NYSRRC Champion!. Truck Driver Named Glen Region Worker of the Year 2008.Located 45 miles southeast of Watkins Glen in Sayre PA.

  2. #2
    Join Date
    Sep 2008
    Location
    Weare, NH
    Posts
    483

    Default


    Glenn Lawton
    GSMmotorsports
    #14 ITS RX7
    NARRC ITS Champion 2012
    NERRC ITS Champion 2013 12 11 10 09 08
    NERRC STU Champion 2010

    __________________

  3. #3
    Join Date
    Jan 2002
    Location
    Sayre PA USA 45 Miles from Watkins Glen
    Posts
    814

    Default

    Glen, finally got to point ordered one and got it is about 3 3/4 " in Diameter vrs the single groove water pump pulley that was on before is about 5 1/8" so if I have theory correct the smaller dual pulley will turn the pimp faster?? We run a gutted thermostat with bypass plugged. I wonder if smaller pulley cause cavitation? Hope you and family are surviving the winter!
    Tom Weaver: Logistics & Technical Support Manager IE truck driver for 1986 RX-7 ITS #63. "Diesel Haulin' Rotary" 2005 Dodge 2500 Quad Cab The Hemi has retired "Long Live the Hemi" Bill Weaver Driver- 2004 NYSRRC John Chave Award. 2006 & 2013 ITS NYSRRC Champion!. Truck Driver Named Glen Region Worker of the Year 2008.Located 45 miles southeast of Watkins Glen in Sayre PA.

  4. #4
    Join Date
    Feb 2001
    Location
    Trussville, Alabama, USA
    Posts
    1,085

    Default

    You are slowing the water pump. With the required racing radiator for the RX7 that should not be a problem. You may, however, research the need for a thermostat.
    Chuck Baader
    White EP BMW M-Techniq
    I may grow older, but I refuse to grow up!

  5. #5
    Join Date
    Mar 2001
    Location
    Connecticut
    Posts
    7,346

    Default

    If the water pump pulley is smaller, then it's making the pump turn faster.

    Is that a pump pulley or an eccentric shaft pulley? And how does it use dual belts if they're not both replaced?

    GA
    Not my circus...not my monkeys...

  6. #6
    Join Date
    Jan 2002
    Location
    Sayre PA USA 45 Miles from Watkins Glen
    Posts
    814

    Default

    Quote Originally Posted by Greg Amy View Post
    If the water pump pulley is smaller, then it's making the pump turn faster.

    Is that a pump pulley or an eccentric shaft pulley? And how does it use dual belts if they're not both replaced?

    GA
    Greg, that is the water pump pulley. The eccentric pulley and alternator pulley are both dual groove to enable use of 2 belts as a "fail safe" also installing a Water pressure warning light.
    Tom Weaver: Logistics & Technical Support Manager IE truck driver for 1986 RX-7 ITS #63. "Diesel Haulin' Rotary" 2005 Dodge 2500 Quad Cab The Hemi has retired "Long Live the Hemi" Bill Weaver Driver- 2004 NYSRRC John Chave Award. 2006 & 2013 ITS NYSRRC Champion!. Truck Driver Named Glen Region Worker of the Year 2008.Located 45 miles southeast of Watkins Glen in Sayre PA.

  7. #7
    Join Date
    Sep 2008
    Location
    Weare, NH
    Posts
    483

    Default

    I had to remember why I sent you that link ...

    We use the LARGER (ie slower) single pulley ... I think
    I just found a dual pulley since you wanted to belt and
    suspenders yourself by using two identical belts at the same time

    I didn't know then, nor does Atkins list, the diameter of their double pulley

    sorry!

    Glenn Lawton
    GSMmotorsports
    #14 ITS RX7
    NARRC ITS Champion 2012
    NERRC ITS Champion 2013 12 11 10 09 08
    NERRC STU Champion 2010

    __________________

Bookmarks

Bookmarks

Posting Permissions

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