the crank shaft its harmonic balance?

Red__Zed

absolutely. I don't give a crap what you do to your car, but I do think it is important that others making this decision have the requisite information.

Most modifications are not done for reliability, and it is absolutely up to the owner to decide what is worth it for them.

This piece is something I don't agree with. First of, I'm not assuming anything, or basing my stance on what I read on some random internet site. I've got a pretty decent background in frequency response of systems (admittedly not in the mechanical domain, but the math is all the same), and a basic understanding of physics. Most of this stuff is pretty basic physics 101 (OK, maybe 201).

To poke holes in the claim that "if this caused failures, we'd have OVERWHELMING EVIDENCE proving it," let me present the following:

As someone who understands cars, your forehead would probably leave an imprint on your desk/keyboard if someone came on the forum and made such a claim. It's an absolutely ridiculous statement (though it does seem these cars will run for a surprising amount of time with no intake filters, who knew?)

Unfortunately, the general populace is poorly educated on things like frequency response of a system, compared to the intake operation of a combustion image.

To be clear, as I've said before, I'm not sure how dramatic of an effect removing this part will have. But again, neither does anyone else who hasn't modeled the part.

Removing it may shorten the life of the engine by 80%, or 3%. In all likelihood, you'll have the part on for 30-50K max, and no failures will ever be linked back directly to the pulley.

The point here is twofold:

1) Let's make sure we paint the whole story to those who might consider this part. Evidence of operation without failure is great to share, and helpful in establishing just how much the part matters (or doesn't). Pretending like the 3-4 guys that have more than 25K with a pulley unquestionably establish the reliability is silly

2)Don't be a lemming. There's no reason we shouldn't demand more information from pulley manufacturers to show that they've done their homework. It might be enlightening.


that could actually be enlightening. See if you can get him to sign up on the forum.