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Interference or Non-interference

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Phantom_X-SP, Jun 2, 2009.

  1. Jun 2, 2009 at 10:15 AM
    #1
    Phantom_X-SP

    Phantom_X-SP [OP] Rude Boy |><|

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    I did a quick search and couldn't come up with an answer. Is the 1GR-FE (2nd gen 4.0) an interference or non-interference engine?

    Also while searching around I found this info on Toyota's website:

    http://www.toyota.co.jp/en/tech/environment/powertrain/engine/index.html

    I wonder if this means that a future Tacoma may come with a 2GR-FSE or 2GR-FE engine due to increased fuel efficiency...
     
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  2. Jun 2, 2009 at 10:18 AM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    I believe the general consensus is that it is non-interference.
     
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  3. Jun 2, 2009 at 10:21 AM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  4. Jun 2, 2009 at 11:12 AM
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    DriverSound

    DriverSound Señor Member

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    I believe the Toyota Venza is now using this engine.
     
  5. Jun 2, 2009 at 12:03 PM
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    j1999t

    j1999t Well-Known Member

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    an engine is called an interference engine when there is more than 2 valves per cylinder, a non interference engine is only 2 valves per cylinder, the interference is caused by the possibility of 2 or more valves possibly striking one another, which could cause them to bend or break, which in turn could ruin your cylinder head and require an engine rebuild...

    just my 2 cents
     
  6. Jun 2, 2009 at 12:16 PM
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    MassTaco

    MassTaco Well-Known Member

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    There are such thing interference 2 valve engines and non-interference 4-valve engines. It has to do with the possibility of the piston crown and the valves trying to exist in the same place at the same time in the event that timing is incorrect. I can't think of a situation where intake and exhaust valves could collide because if the timing belt/chain let go, neither would be in motion.
     
  7. Jun 2, 2009 at 12:47 PM
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    Phantom_X-SP

    Phantom_X-SP [OP] Rude Boy |><|

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    Correct


    2GR-FE:
    2GR-FSE:
     
  8. Jun 2, 2009 at 12:49 PM
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    Phantom_X-SP

    Phantom_X-SP [OP] Rude Boy |><|

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    X2
     
  9. Jun 2, 2009 at 12:51 PM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    From what I have read is that all of the VVT-I engines are interfernce engines, including the 4.7L in my tundra which happens to be belt driven.
     
  10. Jun 2, 2009 at 3:42 PM
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    Phantom_X-SP

    Phantom_X-SP [OP] Rude Boy |><|

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    Good find :thumbsup:

    I wasn't concerned really...just curious. I had a conversation recently about a prevoius engine I did work on and wondered about the 1GR-FE.

    What year is your Tundra?
     
  11. Jun 2, 2009 at 4:17 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Incorrect. Interferance engines are ones in which the piston takes up the space the valves do when they are open, and the piston is at TDC. When the timming drive system (Belt or chain) breaks, this can lead to damaged pistons and/or bent valves, as well as other damage.

    OP, Toyota does not manufacture an interferance engine. The only ones who do (IIRC) is Honda, Mazda, and a couple of older Nissan engines.
     
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  12. Jun 2, 2009 at 4:24 PM
    #12
    JoeSchmuck

    JoeSchmuck Well-Known Member

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    Um, What? I hope that isn't true, if so I'd love to see the reference.

    Interfere = Valve (intake or exhaust) in fully open position can hit the top of the piston in the fully up positon.
    Non-interefere = Valves fully open cannot hit the top of the piston in the fully up position.

    This is important when a cam shaft belt or chain breaks because the piston will come in contact with any valves in thier opened positions and cause engine damage on an interfering engine. This is why a non-interfereing engine is nice to have. If a timing belt/chain breaks on the non-interfering engine you can make a safe assumption you will not need to replace pistons and valves which get costly.

    Hope this helps.

    Joe
     
  13. Jun 2, 2009 at 5:22 PM
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    Phantom_X-SP

    Phantom_X-SP [OP] Rude Boy |><|

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    So which one is it guys??? Any links to reference??? :notsure:
     
  14. Jun 2, 2009 at 5:25 PM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The only "Link" I have is that I have torn these engines apart, and one of my buddies works only on Toyota engines. otherwise, I have no proof...:(
     
  15. Jun 2, 2009 at 5:30 PM
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    Phantom_X-SP

    Phantom_X-SP [OP] Rude Boy |><|

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    That sounds like a pretty good "link" lol I appreciate the insight Chris :thumbsup:
     
  16. Jun 2, 2009 at 5:53 PM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    :)
     
  17. Jun 3, 2009 at 5:37 AM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  18. Jun 3, 2009 at 7:03 AM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    This supports Chris' claim:
    http://www.aa1car.com/library/2003/us70343.htm
    A list of Toyota Interference engines:
    http://www.automotix.net/autorepair/toyota-pickup-engine_repair_guide-1867.html
     
  19. Jun 3, 2009 at 7:09 AM
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    98tacoma27

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  20. Jun 3, 2009 at 7:38 AM
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    Phantom_X-SP

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