Water pump flywheel? - CorvetteForum - Chevrolet Corvette Forum Discussion

Go Back   >
Log In 
Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C4 Tech/Performance
L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Water pump flywheel?

Reply
 
 
 
Thread Tools Search this Thread
Old 07-21-2010, 04:08 AM   #1
gsixl
CF Senior Member
Thread Starter
 
gsixl's Avatar
 
Member Since: May 2007
Location: Arkansas City Kansas
Posts: 148
Thanks: 0
Thanked 1 Time in 1 Post
Default Water pump flywheel?

Can anyone tell me why I need this? Seems like just added weight what is it doing for me?
gsixl is offline   Reply With Quote
Old 07-21-2010, 04:32 AM   #2
Weav's Vet
CF Senior Member
Support Corvetteforum!
 
Member Since: Dec 2007
Location: Sandhills of North Carolina
Posts: 3,616
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Sounds like the Frisbee. You can remove it.

http://forums.corvetteforum.com/c4-t...e-removal.html
Weav's Vet is offline   Reply With Quote
Old 07-21-2010, 06:53 AM   #3
65Z01
CF Senior Member
Cruise-In II Veteran
 
65Z01's Avatar
 
Member Since: Dec 2000
Location: SE NY
Posts: 70,217
Thanks: 0
Thanked 7 Times in 6 Posts
Default

Indeed it's the "frisbee" that was installed to dampen out any vibration when the new (in '88) A/C compressor kicked on/off.

Toss it and use lock washers under the bolt heads; should be worth ~10 chp gain.
65Z01 is online now   Reply With Quote
Old 07-23-2010, 04:40 AM   #4
gsixl
CF Senior Member
Thread Starter
 
gsixl's Avatar
 
Member Since: May 2007
Location: Arkansas City Kansas
Posts: 148
Thanks: 0
Thanked 1 Time in 1 Post
Default

I took it off. My first trip to work without it I noticed the engine will buck at low rpm right before the downshift from 4th to 3rd. Engine was not fully warmed up yet never had this before? Didn't seem to do it after engine was up to temp.
gsixl is offline   Reply With Quote
Old 07-23-2010, 12:48 PM   #5
GREGGPENN
CF Senior Member
 
GREGGPENN's Avatar
 
Member Since: Nov 2003
Location: Overland Park Kansas
Posts: 10,297
Thanks: 0
Thanked 8 Times in 7 Posts
Default

Doesn't seem likely that the frisbee prevented bucking during a downshift but I suppose there's small possibility it was helping to mask a problem you might have with injectors or tuning/tune-up. Or...it was total coincidence. If it continues, simply reinstall and report if the problem disappears.

FWIW: Extra weight you add to a motor will create an interia that helps keep the motor running. That's why a heavier FW is easier to drive with a stick than a lightweight alum one. Considering they put that weight on the WPump vs the A/C, I'm more inclined to think that extra inertia keeps the engine RUNNING smooth when the A/C kicks in.

Any chance your A/C was running and the compressor happened to be kicking on JUST as you were downshifting?

Last edited by GREGGPENN; 07-23-2010 at 06:40 PM.
GREGGPENN is offline   Reply With Quote
Old 07-23-2010, 06:28 PM   #6
gsixl
CF Senior Member
Thread Starter
 
gsixl's Avatar
 
Member Since: May 2007
Location: Arkansas City Kansas
Posts: 148
Thanks: 0
Thanked 1 Time in 1 Post
Default

Could have been a fluke as I didn't notice it toady. Ac was not running at the time. I will keep testing.
gsixl is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Water pump flywheel?
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Is it just me? z10 C6 Z06 Discussion 6 07-15-2014 10:39 PM
    Happy birthday to me... gs568 Off Topic 20 03-13-2014 08:27 AM
    Mud HyperX Off Topic 5 08-31-2013 02:24 AM
    delete me snoopdan C4 Parts for Sale/Wanted 0 03-28-2013 02:46 PM
    Taylor here Nathan add me Just Cruise Testing 0 03-07-2013 03:50 PM


    Tags
    1989, c4, corvette, flywheel, pump, water

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 06:38 AM.