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Hmmm: 1GR-FE impossible to bore the block?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by th3duke, Oct 3, 2010.

  1. Oct 3, 2010 at 5:21 PM
    #1
    th3duke

    th3duke [OP] Active Member

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    Just reading up on the 4.0, and noticed that you can't re-bore the block... So these blocks are throw away? Unbelievable - they don't make 'em like they use to (22-RE, 3VZ...)

    Check it out:

    "This engine has special cast-iron cylinder liners cast into the block, which are a spiny type to improve adhesion between the liner and cylinder block. With these special thin liners it is impossible to bore the block."

    hxxp://en.wikipedia.org/wiki/Toyota_GR_engine
     
  2. Oct 3, 2010 at 5:24 PM
    #2
    Jason'sLawnCare

    Jason'sLawnCare Prepared for Bambi

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    Why does that make them "throw away"?
     
  3. Oct 3, 2010 at 5:29 PM
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    th3duke

    th3duke [OP] Active Member

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    No idea... I had a 22-RE in my 87 4-Runner and the guy at the shop said they could be bored up-to 50 over... You could literally rebuild those blocks twice easy...

    I hope someone here is knowledgeable enough to educate me as to why these blocks are impossible to bore...
     
  4. Oct 3, 2010 at 5:29 PM
    #4
    jandrews

    jandrews Carolina Alliance Southwest Region Ambassador

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    Nothing's impossible with enough time and money.

    "Much harder" to bore the block would be a more appropriate term.
     
  5. Oct 3, 2010 at 5:29 PM
    #5
    08pretaco

    08pretaco Almost there

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    its also wikipedia that your getting your info. maybe go to a more reliable source to get your info.
     
  6. Oct 3, 2010 at 5:30 PM
    #6
    th3duke

    th3duke [OP] Active Member

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    Sure thing any recommendations?
     
  7. Oct 3, 2010 at 5:32 PM
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    08pretaco

    08pretaco Almost there

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    let me do a little searching and see if i can find some useful info before chris pops his head in this thread lol
     
  8. Oct 3, 2010 at 5:37 PM
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    WTtoolman

    WTtoolman Facial bones colapse as I crack your skull in half

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    With motorcycles, the liners themselves aren't borable, but they can be removed and thinner liners pressed in. However, if they are "cast" into the block, the liners may not be removable.
     
  9. Oct 3, 2010 at 5:41 PM
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    08pretaco

    08pretaco Almost there

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    i tried multiple things in a google search and basically the only thing is the first couple links that go to wiki. maybe there is a member on here that will chime in soon and has come across this dilemma :)
     
  10. Oct 3, 2010 at 5:43 PM
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    th3duke

    th3duke [OP] Active Member

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    Figured this one would be a good topic. :) I can't find anything to the contrary so far...
     
  11. Oct 3, 2010 at 5:55 PM
    #11
    revhappyleon

    revhappyleon Well-Known Member

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    if you bore the liners out even further they can crack and you have a bigger issue with hotspots because there isn't as much material to soak up the heat
     
  12. Oct 3, 2010 at 5:55 PM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    You cant re bore the block of the 1GR engine. However, you would have to have a pretty big boo boo to screw up the bore liners.
     
  13. Oct 3, 2010 at 5:58 PM
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    08pretaco

    08pretaco Almost there

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    ya i do apologize! I reread my post and it seemed very harsh and unlike what I intended it as. It is a great topic which i dont think I have seen before and now we all know what the deal is!
     
  14. Oct 3, 2010 at 6:00 PM
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    th3duke

    th3duke [OP] Active Member

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    Hey no sweat; didn't take it as such. :)
     
  15. Oct 3, 2010 at 6:04 PM
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    th3duke

    th3duke [OP] Active Member

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    A big boo boo, like run the engine for 300 thousand Kms? That's what I had on my 4Runner before I decided to give it some more life - motor was tired... I plan on running this one just as long - had the other one 21 years before buying this Taco. :)
     
  16. Oct 3, 2010 at 6:14 PM
    #16
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The cylinder sleaves on the 1GR are cast into the block as a whole. Most (if not all) aluminum block engines are not able to be re bored. SOME can be re sleaved, but those are dying out. Older cast iron engines can be bored out. The benafits of aluminum over cast iron are many. it doesnt retain heat like a cast iron block, its much lighter, with the use of aluminum heads, the chance of a leaking or blown head gasket is reduced significantly (as the 2 metals expand and contract with heat at the same rates, vs. a cast iron block/aluminum head engine), and with modern aluminum engine alloys, the ductility of the aluminum can exceed that of a cast iron block.
     
  17. Oct 3, 2010 at 6:15 PM
    #17
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The 1GR engine is deisgned to go well over 250k miles before any major malfunction. The block itself is way over built for what it does.
     
  18. Oct 3, 2010 at 6:22 PM
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    Jason'sLawnCare

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    Makes sense. I just think their was better wording than "throw away"
     
  19. Oct 3, 2010 at 6:25 PM
    #19
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Any block is "Throw away"... You throw a rod in a cast iron block, and it wont fair any better than the same thing in an aluminum blocked engine. The only big deal for aluminum vs. cast iron I can think of, is:
    In a cast iron block, if you burn a piston, and score the cylinder, you "may" be able to bore it out and fix it. Depending on how deep the damage is. You cant do that in an aluminum engine. HOWEVER, that was mostly a concern in carbed engines. With modern fuel injection, and higher sampling rates on the engine computers, you dont hear of that happening as often as you used to.
     
  20. Oct 3, 2010 at 6:30 PM
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    th3duke

    th3duke [OP] Active Member

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    Glad to hear that for sure - Like I said though, I didn't have a major malfunction with my 22-RE, it was tired though... I only had to bore it 20 over, and now have over 560 thousand KM on the truck... As I eluded to before, my machine shop indicated that it had enough meat on it for up-to 50 over. Hence, I could have bored it again (if needed).

    That's my only point; in terms of reliability I have no doubt Toyota still has it (that's why I purchased this 2010).
     
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