Proof that the blower overspining is a direct cause of his motor blowing.

 

This is what I was thinking as well from my other post. Its like on my motorcycle for example. I have a sprocket on the rear wheel and one on the primary/motor. Both are connected to a single chain. If I want to change the rpm speed vs mph I change the sprocket size, I have my choice of two sprockets, it doesn't matter which sprocket i change, they both net the same result of the rpm vs mph. The only difference is changing 1 tooth on the primary/engine side is worth 3 teeth to get same results from the rear wheel. So when I think of the blower being the rear wheel and the crank being the primary/engine side there is no difference.

The only reason I see needing to change the crank pulley is if your blower speed can be increased beyond what a small pulley can do alone on the blower. If your blower can handle say 20psi but you can only drive it up to 15psi from a blower pulley, then you have to change the crank pulley size to net the other 5psi. has nothing to do with getting max psi without over spinning, the two don't relate in this matter, someone just confused the two somewhere down the communication path like several other rumors floating around on these forums. This is how I see it.

 

The two are not related in this case either It would merely be a coincidence. An over spun blower creates blower damage, not engine damage.

 

So far we've covered magical pulleys, overspinning pulleys, crank pulleys, pulley ratios, and pulleys of mass destruction.

Whew...I think our work here is done.

 

There has been one guy with a stock KW high boost that blew his charger but KW replaced asap!

I spoke with OJR a week ago about the updated pulleys... he told me too look out for a post on s2ki in the next few weeks.

 

s.hasan546,S2kHabitat, s2000Junky: Sorry, I didn't mean to strike a nerve. I should be more careful of how things are worded here. I meant bits of pieces of the damaged blower (from overspinning...at the track) got into the engine. You can say it is BS, but believe whatever you want.

 

[QUOTE=soulicious,Nov 15 2009, 10:25 PM] s.hasan546,S2kHabitat, s2000Junky: Sorry, I didn't mean to strike a nerve.

 

nah its ok its just that we need to hear from the owner and the circumstances. was he watches his temps at the track? was he using the 90 mm pulley? theres a lot of factors that go into this and if a stock high boosted kw kit blew i can confidently say KW would take care of their faulty equipment.

 

For whoever asked, the Rotrex is a precision engineered bucket of gears. If you break one, the whole thing will probably shatter and potentially send millions of pieces of metal particles shooting into your intake. Therefore engine damage is not out of the question.

But let's not blow things out of proportion. This would happen on any s/c, turbo, or whatever spinning gizmo.

 

Oh and the rotrex blower is still able to be rebuilt to an extent contrary to the bs info rotrex tries to tell everyone. The M3 forum has been doing it for years.