Civic change to timing chain

Discussion in 'Civic' started by Ivory123, Jun 5, 2010.

  1. Ivory123

    Ivory123 Guest

    I've read several threads that mention the change of the Civic to
    timing chains.

    Can anyone say the year the Civics changed to timing chains?

    Ivory123, Jun 5, 2010
  2. If I remember correctly, all Civic models from 2006 on have a timing chain.
    Pre-2006, it's a belt... except for the 7th-gen (2001-05) Si hatchback which
    had a chain.
    Eternal Searcher, Jun 5, 2010
  3. Ivory123

    Joe Guest

    Joe, Jun 6, 2010
  4. Ivory123

    Erik Guest

    Don't know about the Civics, but I recently bought a used 08 Fit. I had
    the dealer throw in a set of factory shop manuals.

    Looking through the manuals, I was very surprised to find it uses a

    I would also like to know the reasoning behind this change. Belts kept
    the valve timing tack on till they failed, and eliminated 'internally
    lubricated component' from warranty coverage...

    Erik, Jun 6, 2010
  5. Ivory123

    jim beam Guest

    there are two main reasons for the trend back to chains:

    1. some owners bitch about the cost of timing belt replacement. and
    probably with good reason since most dealers take the opportunity to
    really hose their customers when they do a belt job.

    2. it's part of the general trend towards life limitation. you can keep
    a belted engine running for another 100k miles with a belt change.
    belted honda engines with 300k+ miles are not uncommon for example. but
    you're not going to get that out of a chained engine without a change.
    and since no chain change is specified, people will just keep it
    running, and by the time they've decided that the thing has worn enough
    to sound like a bag of loose gonads, they'll think the motor is dead and
    junk the whole thing rather than try to keep it running.

    practically speaking, and to be fair, chains have improved a lot.
    modern wear rates are relatively low. tensioner strategies have
    improved. and they're cheap.

    here is the important development that has made them more popular again:
    computerized design tools. in the old days, people designed stuff, and
    it worked, and that was that. today, designs are so minutely considered
    that what used to be wear points or noise points can be addressed and
    either reduced or eliminated. for instance, with gears, engineers now
    not only design the teeth profiles for maximum strength with minimum
    material, that profile is so intricate, it also takes into account the
    elastic deformation when loaded in operation! that helps reduce both
    noise and wear. to emphasize again, that is a BIG DEAL. applied to
    chains and sprockets, that design strategy also helps reduce noise and
    wear, thus removing a lot of the issues with chains that belts were used
    to avoid. additionally, one of the issues with cams is its tendency to
    change its angular velocity as it rotates because of the spring loading
    on the cam followers. with computer designed cam profiles, the worst of
    that has been reduced, and thus, so has chain loading, and thus also
    wear rate and noise. so, while a belt is inherently a better solution
    for camshaft drives because it not subject to stretch and doesn't cause
    the point loading that a chain does, a lot of the objections to chains
    have been reduced, and tied with #2 above, they're an acceptable compromise.

    bottom line, we're going to see belts become a thing of the past.
    afterall, car companies are run by bean counters, not engineers and
    while belts may be technically superior, chains are now an acceptable
    mechanical solution, and their financial advantages are significant.
    jim beam, Jun 6, 2010
  6. Ivory123

    Tegger Guest

    This is correct. I checked on

    Techinfo actually says that the "3-door" Civic had a chain from '01 to '05.
    I'm assuming all "3-doors" were Si's.
    Tegger, Jun 7, 2010
  7. I believe you're right, although in Canada it was known as the Si-R.
    Eternal Searcher, Jun 7, 2010
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