Double rolled timing chain vs. belt

[Minerva]

At what point in their lifespan does the crossover occur where excessive RPM can cause failure?

 

[Zenmervolt]

Huh???

To the best of my knowledge the answer to your question is "never".

A timing belt is good up to redline at any point during its service life. Same with a timing chain. Just that a belt's life is 30,000 - 90,000 miles while a chain will typically last the life of the engine.

Neither can be damaged by any RPM within the engine's design parameters. Honestly, there are many other things that will break if the engine is over-revved before the timing belt/chain will.

ZV

 

[God On Alcohol]

Originally posted by: Zenmervolt
Huh???

^

 

[Minerva]

As each gets older, higher revs produce more stress. Obviously the belt will go first but it stretches more than a chain. Both can break right?

In a constant use scenario (generator) which would give more MTBF?

 

[HamburgerBoy]

Originally posted by: Minerva
At what point in their lifespan does the crossover occur where excessive RPM can cause failure?

So, what website do you copy and paste random technical questions from?

 

[HamburgerBoy]

Oh, and wrong forum?

 

[Looney]

A girl that knows about cars and riggings.... that's a little unusual.

 

[Minerva]

This is hardly highly technical guys.

 

[OrganizedChaos]

as far as i knew timing chains were good for the life of the engine, the tensioner will take up any slack that develops. that may not apply to them screwey import engines te need them replaced for reasons unknown to me.

 

[Zenmervolt]

See my previous post. A properly designed belt will be perfectly happy to spend its entire design life within the design parameters. Those design parameters include redline. Same with a chain.

ZV

 

[Zenmervolt]

Originally posted by: OrganizedChaos
as far as i knew timing chains were good for the life of the engine, the tensioner will take up any slack that develops. that may not apply to them screwey import engines te need them replaced for reasons unknown to me.

Those "screwy import engines" use belts, not chains you idiot. Even import engines with chains do not need the chains replaced with the engine's expected life span.

ZV

 

[Minerva]

Originally posted by: Zenmervolt
Huh???

To the best of my knowledge the answer to your question is "never".

A timing belt is good up to redline at any point during its service life. Same with a timing chain. Just that a belt's life is 30,000 - 90,000 miles while a chain will typically last the life of the engine.

Neither can be damaged by any RPM within the engine's design parameters. Honestly, there are many other things that will break if the engine is over-revved before the timing belt/chain will.

ZV

This exactly what I was looking for. Thank you! It looks like I won yet another bet! 😀

 

[Kadarin]

Originally posted by: Minerva
As each gets older, higher revs produce more stress. Obviously the belt will go first but it stretches more than a chain. Both can break right?

In a constant use scenario (generator) which would give more MTBF?

Timing belts generally have to be changed at about what, 50-80k miles? In most cases, a timing chain does not have to be changed until the motor is rebuilt, and even then only because it stretches out (which, I believe, has the effect of retarding the cam timing, reducing low-end torque.)

I've never heard of anyone breaking a timing chain.