Alt fuse blowing at WOT, what is going on there?

[toyman]

That statement wasn't made by me, it was made by Toyman. Further, when I was talking RPM's I was stating that when my tach in the car would reach 5K, it would blow my alt. fuse.

And I believe I understand what you were trying to say. You were talking about the relationship between the rotor in the alt and the alternator pulley and that they spin at the same speed. That is correct. But if the engine is turning 5000 rpms, then Toyman was trying to say the alternator itself is probably turning 10K rpms.

Correct, if the engine is turning 5000 rpm then the alternator is turning 10K+. I don't recall the formula for determining centrifical and/or tangental forces but I'm guessing they increase expodentially so the stresses on the rotor/armature are a lot greater than simple math would indicate. I was mentioning this as it was noted that a soldered connection had broken and at 5000 (crank) rpm the loose connection started to short against the housing.

 

[HISSIN50]

Should be able to get alternator RPM with:

[Crank pulley/Alt pulley] x Engine RPM

3G's dont like more than about 15K alternator RPM

 

[99FiveOh]

either way, it's charging perfectly now and I redlined the car and zero alt fuse poppage (is that a word????)