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#41
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Timing belt question
"Leon van Dommelen" > wrote in message
... > "J Brockley" > wrote: > >> >>"Zog The Undeniable" > wrote in message ... >>> zenmartini wrote: >>>> I know the timing belt is supposed to be replaced at 60k. My 2000 is >>>> at 75k but the belt is in good condition... no nicks etc. Money is >>>> tight at the moment... how much longer can I go before this has to be >>>> replaced... I know that I'll be stuck wherever I am but there is no >>>> damage that can occur right? >>>> >>> The biggest risk is that it fails halfway through an overtaking >>> manoeuvre. >>> However, and for reasons I don't understand, the Miata/MX-5 belts >>> normally >>> fail when the engine is first fired up. >>Inertia. The two I had fail (not in MX5) occurred at startup and in one >>case >>when warm. I guess when started there is a sudden change in lateral >>tension >>on the teeth from nothing to something high before it calms down and >>everything gets moving. I guess the only other time the rate of change is >>approached is when you put your foot down hard. > > Did they fail when you were cranking the engine or when it started? > > Leon > -- Cranking. Never seen one snapped but seen where teeth start to part company with belt. |
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#42
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Timing belt question
"J Brockley" > wrote:
>"Leon van Dommelen" > wrote in message .. . >> "J Brockley" > wrote: >> >>> >>>"Zog The Undeniable" > wrote in message ... >>>> zenmartini wrote: >>>>> I know the timing belt is supposed to be replaced at 60k. My 2000 is >>>>> at 75k but the belt is in good condition... no nicks etc. Money is >>>>> tight at the moment... how much longer can I go before this has to be >>>>> replaced... I know that I'll be stuck wherever I am but there is no >>>>> damage that can occur right? >>>>> >>>> The biggest risk is that it fails halfway through an overtaking >>>> manoeuvre. >>>> However, and for reasons I don't understand, the Miata/MX-5 belts >>>> normally >>>> fail when the engine is first fired up. >>>Inertia. The two I had fail (not in MX5) occurred at startup and in one >>>case >>>when warm. I guess when started there is a sudden change in lateral >>>tension >>>on the teeth from nothing to something high before it calms down and >>>everything gets moving. I guess the only other time the rate of change is >>>approached is when you put your foot down hard. >> >> Did they fail when you were cranking the engine or when it started? >> >> Leon >> -- >Cranking. Never seen one snapped but seen where teeth start to part company >with belt. Stress concentrations would likely be larger when the rubber is cold. Leon -- Leon van Dommelen Bess, the Miata Bozo, the Miata http://www.dommelen.net/miata The only thing better than a white Miata is two white Miatas |
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