BBi engine rebuild | FerrariChat

BBi engine rebuild

Discussion in 'Boxers/TR/M' started by Newman, Nov 10, 2023.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. Newman

    Newman F1 World Champ Consultant Owner Professional Ferrari Technician

    Joined:
    Dec 26, 2001
    Messages:
    14,449
    Location:
    Canada
    Full Name:
    Newman
    This engine is pretty original other than the usual EO services over the years. Reliability was the main concern so the goal was to replace the exhaust valves as a preventative measure before a head falls off one, perform the service and clean it up, detail etc.

    Leak down numbers showed 38% past an intake valve (lash setting was fine) and 8-10% being a combo of other valves and ring seal. Oil consumption was another symptom.

    Image Unavailable, Please Login Image Unavailable, Please Login
     
    ItalianOne likes this.
  2. Newman

    Newman F1 World Champ Consultant Owner Professional Ferrari Technician

    Joined:
    Dec 26, 2001
    Messages:
    14,449
    Location:
    Canada
    Full Name:
    Newman
    scudF1 likes this.
  3. boxerman

    boxerman F1 World Champ Silver Subscribed

    Joined:
    May 27, 2004
    Messages:
    19,722
    Location:
    FL
    Full Name:
    Sean
    Going to do pistons cams and valves?
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ Lifetime Rossa

    Joined:
    Jan 11, 2001
    Messages:
    26,795
    Location:
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    How many miles? Was all of the pitting at the "bottom" surface of the cylinders (condensation drops rolling down and sitting at the "bottom")?
     
    turbo-joe likes this.
  5. Newman

    Newman F1 World Champ Consultant Owner Professional Ferrari Technician

    Joined:
    Dec 26, 2001
    Messages:
    14,449
    Location:
    Canada
    Full Name:
    Newman
    Looks like moisture, reminds me of one I did that lived in Hawaii and had a lot of pitting, oil consumption.

    No cams. Doing pistons of course and valves.
     
    turbo-joe likes this.
  6. turbo-joe

    turbo-joe F1 Veteran

    Joined:
    Apr 6, 2008
    Messages:
    9,528
    Location:
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    and sleeves of course?
     
  7. Newman

    Newman F1 World Champ Consultant Owner Professional Ferrari Technician

    Joined:
    Dec 26, 2001
    Messages:
    14,449
    Location:
    Canada
    Full Name:
    Newman
    Boring them oversize not replacing
     
    turbo-joe likes this.
  8. turbo-joe

    turbo-joe F1 Veteran

    Joined:
    Apr 6, 2008
    Messages:
    9,528
    Location:
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    but for this you have to take them out. I once tried to bore them to oversize ( had at that time the machines). first was working, but the second one started to turn. so I took them all out and put in new ones with std.
    would it not be cheaper to take new ones? labor is the same.

    so put in higher compression pistons?
     
  9. Newman

    Newman F1 World Champ Consultant Owner Professional Ferrari Technician

    Joined:
    Dec 26, 2001
    Messages:
    14,449
    Location:
    Canada
    Full Name:
    Newman
    They have to be taken out to properly rebuild the engine but they get put back in and machined in the block with a torque plate and a head gasket to simulate an installed cylinder head. The sleeves change shape when under compression so for the best results they need to be machined under those conditions.

    I'll up the compression ratio a little bit for an increase in torque.
    Image Unavailable, Please Login Image Unavailable, Please Login
     
    turbo-joe likes this.
  10. turbo-joe

    turbo-joe F1 Veteran

    Joined:
    Apr 6, 2008
    Messages:
    9,528
    Location:
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    you are right paul. but I bored the sleeves outside, put them in then and honed them inside.
    good idea with the headgasket and a torque plate ;)
     
  11. Threeofnine

    Threeofnine Formula Junior

    Joined:
    Dec 11, 2020
    Messages:
    394
    Location:
    Birmingham, AL USA
    Full Name:
    Jarrod Heath
    Out of curiosity, about what would this cost?
     
  12. turbo-joe

    turbo-joe F1 Veteran

    Joined:
    Apr 6, 2008
    Messages:
    9,528
    Location:
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    much much money - but worth every cent when doing right
     
  13. turbo-joe

    turbo-joe F1 Veteran

    Joined:
    Apr 6, 2008
    Messages:
    9,528
    Location:
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    but only with very low "pressure" that the sleeves will not turn
     
  14. Threeofnine

    Threeofnine Formula Junior

    Joined:
    Dec 11, 2020
    Messages:
    394
    Location:
    Birmingham, AL USA
    Full Name:
    Jarrod Heath
    I would guesstimate $40k? Hopefully it will be a long time before my TR needs an overhaul.
     
  15. 2dinos

    2dinos F1 Rookie

    Joined:
    Jan 13, 2007
    Messages:
    3,025
    New main bearings? Another 'while you're in there' event?
     
  16. 2dinos

    2dinos F1 Rookie

    Joined:
    Jan 13, 2007
    Messages:
    3,025
    How do you torque those nuts for the mains? Looks like limited space.
     
  17. 2dinos

    2dinos F1 Rookie

    Joined:
    Jan 13, 2007
    Messages:
    3,025
    Diff carrier?
     
  18. Newman

    Newman F1 World Champ Consultant Owner Professional Ferrari Technician

    Joined:
    Dec 26, 2001
    Messages:
    14,449
    Location:
    Canada
    Full Name:
    Newman
    It already has one of my diffs in it but it was set up incorrectly wherever it was installed. Backlash is .012" and no preload by the feel of it so I'll tighten that up and check the pattern.

    Image Unavailable, Please Login

    Here's one I took out of a car, didn't look broken until I undid the left side support and it spread open. I'm making another batch of diffs because I've had some requests.
    Image Unavailable, Please Login Image Unavailable, Please Login


    I have a tool I made that's 2" long with a box end wrench end and a 1/2" drive for the torque wrench. It changes the actual torque setting I use because of the 2" added length.
     
    samsaprunoff likes this.
  19. JohnMH

    JohnMH Formula 3

    Joined:
    Jan 28, 2004
    Messages:
    1,818
    Location:
    Bologna
    Agreed - my 78 had rust on the bottom of a few cylinders. It ended up being more cost effective to buy 12 new cylinders at stock bore size and install quality HC pistons. The car is as quick as my TR now.
     
    turbo-joe likes this.
  20. JohnMH

    JohnMH Formula 3

    Joined:
    Jan 28, 2004
    Messages:
    1,818
    Location:
    Bologna
    Memories. I can vouch for Newman’s differential carrier. Installation in the TR was easy and the pattern was perfect, once Romano sent me a shim. Thanks again to both of you.
     
    EZORED, Newman and turbo-joe like this.
  21. 4right

    4right F1 Rookie Rossa Subscribed

    Joined:
    Sep 14, 2008
    Messages:
    2,966
    Location:
    US/Japan/Singapore/Canada/US
    Like the new wall art!
     
    Newman likes this.
  22. Newman

    Newman F1 World Champ Consultant Owner Professional Ferrari Technician

    Joined:
    Dec 26, 2001
    Messages:
    14,449
    Location:
    Canada
    Full Name:
    Newman
    Before pulling the engine I noiced the 2 groove a/c pulley which isn't right for a boxer. Check out the misalignment.

    I need a single groove, if anyone has one shoot me a pm please.

    Image Unavailable, Please Login
     
  23. Newman

    Newman F1 World Champ Consultant Owner Professional Ferrari Technician

    Joined:
    Dec 26, 2001
    Messages:
    14,449
    Location:
    Canada
    Full Name:
    Newman
    Ferraripilot likes this.
  24. Rifledriver

    Rifledriver Three Time F1 World Champ

    Joined:
    Apr 29, 2004
    Messages:
    37,099
    Location:
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    If they are not honed with full torque on the torque plates it is pointless. BB cylinders balloon in the middle when under full pressure and will never seal well. One of the reasons for their well known smoke and oil consumption issues. That and the terrible rings and pistons used back then.
     
    Newman and Ferraripilot like this.
  25. Ferraripilot

    Ferraripilot F1 World Champ Owner Project Master

    Joined:
    May 10, 2006
    Messages:
    17,849
    Location:
    Atlanta
    Full Name:
    John!
    Do you remember about how much the distortion was in the middle? Half a thou or so? Just curious for documentation purposes.
     

Share This Page