Drive Belt and Timing Belt

[4JGtootsie]

It does. Kaya ang serpintine belts have groves same direction as the belt. Kung hindi siya dapat mag slip then dapat pang timing belt (with teeth) ang gamit niya.
Kawawa ang makina pag nag stuck ang bearing ng alternator, aircon or hard steering.
Also imagine how fast the AC compresor clutch engages and the load it has if your belt doesnt slip ng kaunti then ramdam mo dapa ng makina.

[oj88]

It does. Kaya ang serpintine belts have groves same direction as the belt. Kung hindi siya dapat mag slip then dapat pang timing belt (with teeth) ang gamit niya.
Kawawa ang makina pag nag stuck ang bearing ng alternator, aircon or hard steering.
Also imagine how fast the AC compresor clutch engages and the load it has if your belt doesnt slip then ramdam mo dapa ng makina.

My context is that, it shouldn't slip under normal engine operation. Normal operation involves A/C cycling, high alternator or HPS loads, etc. The engine is designed to handle those loads, damped or not. If the belt slips under the above circumstances, the belt is probably not installed properly, is of the wrong kind or the belt and/or tensioner is already worn down, or there's oil/lubricant in the belt path. Slipping will cause accelerated belt wear and glazing, which will further make the contact surface more slippery.

With regards to the A/C clutch, the clutch will slightly slide upon contact and it shouldn't be the belt that's doing that. This is more to protect the A/C compressor from the sudden jerk than to protect the engine. If you look closely and you're familiar with leverage from physics class, it will be very hard for the serpentine belt to slip due to the relatively large diameter of the A/C pulley.

Though, in situations where a bearing or pulley becomes stuck and if the forces applied are beyond the frictional coefficient of the belt and the pulley, it will definitely slip. But then, this is already outside the engine's normal operation.

[4JGtootsie]

Assuming everything was installed properly, tension is good, pulleys are in order.
What causes wear in ordinary belt or serpentine type?
Why do we have to replace them once in a while?

[oj88]

What causes wear in ordinary belt or serpentine type?
Why do we have to replace them once in a while?

Friction, flexing, tension and heat.

Friction - Some rubbing naturally occurs as the belt lines up in and out of the pulley and grooves. This is analogous to tires. Rolling friction causes it to wear... doing burnouts or sudden acceleration and braking just speeds up the wear.

Flexing and tension - Most belts are bent more than 270 degrees as it goes around different pulleys... doing that while the tensioner keeps it tight enough to prohibit slipping. Rubber fatigue will eventually weaken the belt's construction.

Heat - Any material will change chemically when repeatedly exposed to heat. Think of it as the material's expiration date.

[4JGtootsie]

When it flexes do you mean it stretches? What causes it to flex?
Is it possible that slippage can cause friction?
Why does sudden braking and acceleration speed up wear?

[oj88]

When it flexes do you mean it stretches? What causes it to flex?
Is it possible that slippage can cause friction?
Why does sudden braking and acceleration speed up wear?

Friction prevents slippage. But if there's slippage, it will cause heat.

I suggest you re-read my previous post about the analogy with tires.

[4JGtootsie]

The job of the tires is similar to the belt. Whether serpentine or ordinary.
Even if serpentine belt nag sislip yan.
We turn the engine to do timing by using all the pulleys connected to the serpentine belt and it still slips before turning the crank shaft pulley. Tensioner is loaded. We had pressure the belt so it will hug the pulleys.
How can that be explained?

[speedyfix]

yeah, the timing belt is not something you want to scrimp on.