New valves and valve Job -should I lap them?

Posted by blazebolt, Feb 4, 2009

Please Support Ace Race Parts
  1. blazebolt

    blazebolt Proven Member

    243
    17
    Joined Jul 29, 2005
    San Jose, California
    Searched, but could not find a direct answer. I'm getting new Manley valves and a 3 angle valve job done on my head. Do I need to (or would I get any benifit from) lap the valves?

    Thanks
     

    Log in/Register to remove ads
    My DSM:
    1995 Mitsubishi Eclipse GSX

    Street Build

    50trim   manual
    Loading...
  2. JusMX141

    JusMX141 Moderator

    12,604
    582
    Joined Dec 13, 2005
    Greensburg, Pennsylvania
    The machine shop should be sure the valves seat properly before they release it to you. This would mean you do NOT need to lap the valves.
     
    Loading...
  3. deviousgst

    deviousgst Proven Member

    441
    1
    Joined Mar 24, 2008
    bakersfield, California
    how much is the shop charging you for the rebuild
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    15.500 @ 101.910 MPH
    Loading...
  4. blazebolt

    blazebolt Proven Member

    243
    17
    Joined Jul 29, 2005
    San Jose, California
    I haven't gone to the shop yet, but I will be doing most of the assembly work myself. The machine shop work I have planned are Hot Tank block and head, magnaflux block, resurface head and block, crankshaft hone, 20 over cylinder bore/hone, balance rotating assembly, pressure test head, 3 angle valve job, replace valve guides, and extrude hone (maybe).

    I'm still getting everything ready and planning what needs to be done and when. The build I'm doing is going to be pretty extensive and expensive and I will be taking my time. I will have a build log when I start the work.
     
    My DSM:
    1995 Mitsubishi Eclipse GSX

    Street Build

    50trim   manual
    Loading...
  5. Defiant

    Defiant DSM Wiseman

    25,202
    123
    Joined Jan 13, 2003
    glorious Galt, California
    Eh, I'm from the old days. I'd lap them. It's not a tough job, it just takes time.

    Then again, I'd not bother to mag the block. I'd also save the price of an extrude hone on a turbo engine. Let the blower take care of the difference.
     
    My DSM:
    Loading...
  6. Colt4G63 also

    Colt4G63 also Proven Member

    2,670
    44
    Joined Jul 23, 2008
    Tonawanda, New York
    I would expect the machine shop to lap them before they put the springs and retainers on. They're doing the valve job right? I always lapped the valves when I did a valve grind. My engine instructor in college taught us that it was a standard part of the process.
     
    My DSM:

    Street Build

    16g   manual
    1992 Mitsubishi Galant VR-4

    Street Build

    14b   manual
    Loading...
  7. blazebolt

    blazebolt Proven Member

    243
    17
    Joined Jul 29, 2005
    San Jose, California
    I originally wasn't going to mag the block, but the block has a little rust and is in unknown condition. The machine shop recommended it, with the inspection process. It sounds like a good idea for my plans with the block, so I'm going along.
     
    My DSM:
    1995 Mitsubishi Eclipse GSX

    Street Build

    50trim   manual
    Loading...
  8. Defiant

    Defiant DSM Wiseman

    25,202
    123
    Joined Jan 13, 2003
    glorious Galt, California
    I'm sure they don't charge that much for it, but DSM blocks aren't known for cracking. I was certified level II in Magna-Flux, and dye penetrant inspection in a life long ago.
     
    My DSM:
    Loading...

Share This Page

Loading...


Log in/Register to remove ads

Support Vendors who Support the DSM Community
Ace Race Parts Advanced Fuel Injection Archer Fabrication Boostin Performance ECM Tuning Extreme Turbo Systems ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions Jackson Auto Machine JNZ Tuning Magnus Motorsports Miller Import Parts Morrison Fabrication & Design OHM Racing Race Components Inc RockAuto RoadSurge Spultronix Performance STM Tuned Strictly Import Motorsports VR Speed Factory