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Interference design engine?

  • 27-05-2009 2:00pm
    #1
    Mycroft H
    Registered Users, Registered Users 2 Posts: 9,313 ✭✭✭


    How do you tell if your petrol car has an interference design engine? Any way to tell by looking at the design of the timing belt? Or if its dohc or sohc?


Comments

  • #2
    L-M
    Registered Users, Registered Users 2 Posts: 23,694 ✭✭✭✭L-M


    I'd say googling your engine is the best way to do it.


  • #3
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    landyman wrote: »
    How do you tell if your petrol car has an interference design engine? Any way to tell by looking at the design of the timing belt? Or if its dohc or sohc?

    Check auto-data under timing belts it will tell you if its interference or "free-wheeling"....

    More than likely its an interference engine.... The last non-interference engine i worked on was in a 70's 924 porsche (Audi 100 engine)....


  • #4
    alias no.9
    Registered Users, Registered Users 2 Posts: 6,352 ✭✭✭alias no.9


    If it's a 16 valve petrol or any diesel, it'll definitely be an interference engine. 8 valve petrols can be either interference or freewheeling depending on design.


  • #5
    maidhc
    Registered Users, Registered Users 2 Posts: 7,722 ✭✭✭maidhc


    DublinDilbert wrote: »
    Check auto-data under timing belts it will tell you if its interference or "free-wheeling"....

    More than likely its an interference engine.... The last non-interference engine i worked on was in a 70's 924 porsche (Audi 100 engine)....

    2.0 OHC Pinto is a non-interference. Only Ford engine in modern times I know of though, and that is gone 20 years?


  • #6
    Redsoxfan
    Registered Users, Registered Users 2 Posts: 5,375 ✭✭✭Redsoxfan


    alias no.9 wrote: »
    If it's a 16 valve petrol or any diesel, it'll definitely be an interference engine. 8 valve petrols can be either interference or freewheeling depending on design.

    What about 20v diesels?


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  • #7
    alias no.9
    Registered Users, Registered Users 2 Posts: 6,352 ✭✭✭alias no.9


    Redsoxfan wrote: »
    What about 20v diesels?

    All diesels are interference because of the higher compression ratios required for them to operate, i.e. the pistion needs to be closer to the valves at TDC.


  • #8
    Tigger
    Closed Accounts Posts: 16,705 ✭✭✭✭Tigger


    timing belts aren't that dear


  • #9
    alias no.9
    Registered Users, Registered Users 2 Posts: 6,352 ✭✭✭alias no.9


    Tigger wrote: »
    timing belts aren't that dear

    No but when you add in the tensioners, idler pulleys and labour, a belt change can be quite expensive. It's still not worth the risk ignoring the service schedule, if that was the OP's motive for asking. On the other hand, the OP may have been interested in doing some DIY mechanics provided the risks are acceptable, i.e. doing it wrong won't result in disaster.


  • #10
    Tigger
    Closed Accounts Posts: 16,705 ✭✭✭✭Tigger


    alias no.9 wrote: »
    No but when you add in the tensioners, idler pulleys and labour, a belt change can be quite expensive. It's still not worth the risk ignoring the service schedule, if that was the OP's motive for asking. On the other hand, the OP may have been interested in doing some DIY mechanics provided the risks are acceptable, i.e. doing it wrong won't result in disaster.


    i see

    op, doing it wrong will end in disaster.


  • #11
    Mycroft H
    Registered Users, Registered Users 2 Posts: 9,313 ✭✭✭Mycroft H


    alias no.9 wrote: »
    No but when you add in the tensioners, idler pulleys and labour, a belt change can be quite expensive. It's still not worth the risk ignoring the service schedule, if that was the OP's motive for asking. On the other hand, the OP may have been interested in doing some DIY mechanics provided the risks are acceptable, i.e. doing it wrong won't result in disaster.

    I've changed several belts before but was just wondering if the belt ever snapped, would i be left with a mangled mess of valves and pistons or just a re timing.....


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  • #12
    Redsoxfan
    Registered Users, Registered Users 2 Posts: 5,375 ✭✭✭Redsoxfan


    alias no.9 wrote: »
    All diesels are interference because of the higher compression ratios required for them to operate, i.e. the pistion needs to be closer to the valves at TDC.

    Cheers. Prior to buying the GT I had believed that the 1.9JTD was non-interference and the timing belt could snap without causing any damage-how wrong I was-thankfully I haevn't had it happen and belts etc were changed a few months ago.


  • #13
    alias no.9
    Registered Users, Registered Users 2 Posts: 6,352 ✭✭✭alias no.9


    landyman wrote: »
    I've changed several belts before but was just wondering if the belt ever snapped, would i be left with a mangled mess of valves and pistons or just a re timing.....

    Changing belts isn't difficult provided you take your time and pay attention to detail. I was just speculating as to your motives were in response to another poster, taking the extreme cases as examples. Out of curiosity what is the car?


  • #14
    L1011
    Registered Users, Registered Users 2 Posts: 71,186 ✭✭✭✭L1011


    LIGHTNING wrote: »
    The 8v 1.2 that Fiat use in Punto (and 500?) is a non-interference design, plus its about the size of a packet of crisps:)

    As is the 1.1 8v in the Panda and any of the other 8v FIRE engines. SuperFIRE 16v are interference though.


  • #15
    zilog_jones
    Registered Users, Registered Users 2 Posts: 6,638 ✭✭✭zilog_jones


    Mazda B-series engines are non-interference


  • #16
    alias no.9
    Registered Users, Registered Users 2 Posts: 6,352 ✭✭✭alias no.9


    zilog_jones wrote: »
    Mazda B-series engines are non-interference

    Like all rules of thumb, there'll be a character somewhere who can manipulate their thumb in the most unexpected of ways and be able to touch their own wrist. There are indeed 16v B-series engines which are non interference, but for the most part it holds true that 16v engines are interference.


  • #17
    JHMEG
    Closed Accounts Posts: 7,686 ✭✭✭JHMEG


    Last time I looked, most Toyota petrol engines were non-interference. 3SGE etc.


  • #18
    unkel
    Registered Users, Registered Users 2 Posts: 66,132 ✭✭✭✭unkel
    Chauffe, Marcel, chauffe!


    maidhc wrote: »
    2.0 OHC Pinto is a non-interference. Only Ford engine in modern times I know of though, and that is gone 20 years?

    I could be wrong but wasn't the good old 1.3 8V engine non-interference? Used by Ford until only a few years ago.

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  • #19
    Fishtits
    Closed Accounts Posts: 1,382 ✭✭✭Fishtits


    unkel wrote: »
    I could be wrong but wasn't the good old 1.3 8V engine non-interference? Used by Ford until only a few years ago.

    Which one? the Kent OHV? or were the early CVH available in 1.3?


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