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millerman

High horsepower evo

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Hey guys

Recently did timing belt and water pump etc on a mates evo7 jap spec

This things had extensive engine work done (stroker kit, anti lag, cams, e85 etc)

Pushing close to 400 at the wheels

Within a month it has torn the water pump pulley.

Is there any reason why it would have done this and is there anyway with the new pulley to avoid it happening again. I'm guessing the water pump can't keep up with the flow rate of the water going past it but yeah bit stumped.

Any help is great

 

Thanks

 

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What do you mean by "torn the pulley"? Also is just a pressed metal type like most factory pulleys?

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Alignment is fine

And it has legit torn the surface where the belt sits on the pulley

Effected pulley is a flat type that grips on the back of a belt. Since this pose I have spoken to an evo specialist and he thinks that the pulley has worn out and has just torn due to being thinned out

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Post a pic up of the pulley if you can?

Edited by HUSTLA

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Daaaamn, that's unlucky. Looks more like something got jammed and cracked that section of the pulley.

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Or belt had too much slack on it.. possible the belt slapped it hard enough to warp and rip apart.

 

But the foreign object theory seems more plausible

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Yeah very bizarre

It had another 2 fracture in two different places

Would horsepower be a factor in this do you think?

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Yeah very bizarre

It had another 2 fracture in two different places

Would horsepower be a factor in this do you think?

 

Nope. If the torque of the crank exceeded friction of the belt/pulley and the ability of the pulley to rotate, it would just slip. This is a low-load situation, with no shock engagement like an AC compressor clutch.

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Aircon has been deleted

These Evos run a balance shaft but this has also been removed when they built the engine. Possible cause perhaps

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I didn't mean that AC was involved, I was drawing reference to a situation of shock load, like when the AC clutch engages and the pulley goes from no load to 100% load.

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