y_p_w
02-22-2005, 01:42 PM
Gord Beaman wrote:
> y_p_w <y_p_w@hotmail.com> wrote:
>
> >
> >
> >Gord Beaman wrote:
> >
> >> "jor" <jor@jor.com> wrote:
> >>
> >>
> >>>My 2000 Avalon book calls for it at 90,000. Not sure what an
interference
> >>>engine is?
> >>>jor
> >>
> >>
> >> An interference engine is one in which, if the timing belt/chain
> >> breaks, the pistons will hit the valves as the engine 'runs down
> >> to a stop' causing much damage to the engine. I understand from
> >> the Toyota experts here that in modern Toyota engines, if they
> >> have a 'timing belt' then they have a non-interference engine and
> >> if they have a 'timing chain' then they have an interference
> >> engine...Mind you, I'm NOT an expert in these engines but that's
> >> what I gather here. YMMV. :)
> >
> >Isn't there the one-in-a-trillion chance that if the timing
> >mechanism breaks, the pistons and valves miraculously move at
> >the same exact rate and never slam into each other? ;-)
>
> No, the valves STOP and the pistons DON'T... (big difference in
> their inertia) :)
Whoops. Forgot the whole thing about valves being attached to
springs. I was thinking of the whole "Give a bunch of chimpanzees
some typewriters and enough time, and they'll produce the complete
works of Shakespeare" cliche.
> y_p_w <y_p_w@hotmail.com> wrote:
>
> >
> >
> >Gord Beaman wrote:
> >
> >> "jor" <jor@jor.com> wrote:
> >>
> >>
> >>>My 2000 Avalon book calls for it at 90,000. Not sure what an
interference
> >>>engine is?
> >>>jor
> >>
> >>
> >> An interference engine is one in which, if the timing belt/chain
> >> breaks, the pistons will hit the valves as the engine 'runs down
> >> to a stop' causing much damage to the engine. I understand from
> >> the Toyota experts here that in modern Toyota engines, if they
> >> have a 'timing belt' then they have a non-interference engine and
> >> if they have a 'timing chain' then they have an interference
> >> engine...Mind you, I'm NOT an expert in these engines but that's
> >> what I gather here. YMMV. :)
> >
> >Isn't there the one-in-a-trillion chance that if the timing
> >mechanism breaks, the pistons and valves miraculously move at
> >the same exact rate and never slam into each other? ;-)
>
> No, the valves STOP and the pistons DON'T... (big difference in
> their inertia) :)
Whoops. Forgot the whole thing about valves being attached to
springs. I was thinking of the whole "Give a bunch of chimpanzees
some typewriters and enough time, and they'll produce the complete
works of Shakespeare" cliche.