Aftermarket pulley wobble with video

[humfrz]

Originally Posted by why?

don't give a crap what anyone says. Subaru in its adds on its own website says the engine is internally balanced. Every i4 and boxer 4 cylinder engine is internally balanced. Harmonic balancer or whatever you wish to call it only are needed for larger engines and v6 or v8 engines because they are all compromised in some fashion.

Our engine is a boxer engine. You literally cannot get more balanced. My Yaris, which is a i4, has had an NST pulley set for 60,000 miles. My BRZ has a pulley set for almost 10,000 miles.

Our stock pulley's are crap. If I was going to add power I'd switch pulley's first thing. It is obvious they were made simply to last forever and not much else. Subaru's have a history of all sorts of idiotic issues that go back to their engineers compromising their engines in some way for the US market. If you really are worried about harmonics you need to go buy that fluidampr damper, hell it supposedly makes more power on a dyno as well.

WOW!

For now, @why? , I'll just challenge the statement which is bolded above.

Are you saying that a boxer engine is more "balanced" than an in-line six ....??




humfrz

[Ultramaroon]

Originally Posted by humfrz

Yep, I hear that.

To me an "engine" is something you pour fuel into to make it run; a "motor" is something you plug in to make run ......

THANK YOU!

[cjd]

Originally Posted by humfrz

Is there a difference or are you just slapping around an old man for giggles ...?

humfrz

No giggles, I learned to respect my elders...

On some engines the pulley plays a crucial role in balancing the whole thing.

On this engine it really is internally balanced, and the pulley itself is balanced (OK, I haven't verified this one, but the engineers say the engine is balanced internally, so I'm pretty sure it's like my previous car, which I did test... that pulley had the same rubber insert and people ran lightweight undamped underdrive pulleys hundreds of thousands of miles no problem...) So the only thing it can do is change how the crankshaft etc. sees harmonic resonance... Which it dampens. No balancing involved.

Pedantic, but if you're arguing its importance when we haven't seen clear failures as a result of pulleys,... I have no clue if it's good or bad. But I do know it's not balancing anything. I also haven't installed a lightweight pulley, though I have one somewhere...

C

[humfrz]

Originally Posted by cjd

No giggles, I learned to respect my elders...

On some engines the pulley plays a crucial role in balancing the whole thing.

On this engine it really is internally balanced, and the pulley itself is balanced (OK, I haven't verified this one, but the engineers say the engine is balanced internally, so I'm pretty sure it's like my previous car, which I did test... that pulley had the same rubber insert and people ran lightweight undamped underdrive pulleys hundreds of thousands of miles no problem...) So the only thing it can do is change how the crankshaft etc. sees harmonic resonance... Which it dampens. No balancing involved.

Pedantic, but if you're arguing its importance when we haven't seen clear failures as a result of pulleys,... I have no clue if it's good or bad. But I do know it's not balancing anything. I also haven't installed a lightweight pulley, though I have one somewhere...

C

Thanks for being gentle on an old man .....

Heck, I don't know if a dampened type pulley is necessary on this engine or not.

All I know is that my car has one ...... and it ain't broke ...... so, I'm not going to "fix" it ......


humfrz

[Ultramaroon]

If the damper wasn't deemed necessary the OEM wouldn't have specified it. A stamped steel pulley is much cheaper to manufacture.

[Captain Snooze]

*sigh* Here we go again.
There's only one answer for this issue:

[Captain Snooze]

Originally Posted by Ultramaroon

If the damper wasn't deemed necessary the OEM wouldn't have specified it. A stamped steel pulley is much cheaper to manufacture.

I refute that statement as a valid argument. Are you suggesting that everything on this car is "necessary". If I remove the radio is the car going to blow up? It would have been cheaper to omit the radio.

[Ultramaroon]

Originally Posted by Captain Snooze

I refute that statement as a valid argument. Are you suggesting that everything on this car is "necessary". If I remove the radio is the car going to blow up?

If you were serious you would've used a better example than the radio.

[humfrz]

Originally Posted by Captain Snooze

I refute that statement as a valid argument. Are you suggesting that everything on this car is "necessary". If I remove the radio is the car going to blow up? It would have been cheaper to omit the radio.

Maybe you should have stopped with the picture of the sexy girl .....


humfrz

[churchx]

I don't think one in pic is still virgin girl

[humfrz]

Originally Posted by churchx

I don't think one in pic is still virgin girl

Would it really matter ...... ??




humfrz

[Captain Snooze]

That's it. I'm emailing Subaru.


Done. If/when they reply I will post here and I will forward their email to those who want it.

[humfrz]

OK, time for lights out.

Pa-pa and Ma-ma are on a new schedule starting tomorrow. Daughter started a new job and has a longer commute. Granddaughters will be arriving at 0715.

Nite all ........... ZZZZZZZZZZ

[Captain Snooze]

Originally Posted by Hawk77FT

.....

I am not disputing that article. I do not have the expertise to do so but.....
I am wary all the same. They (Fluidampr) are trying to sell their product. I look at their graph and say to myself "Holy shit! Just look at the difference their damper makes!" That is the intention. I am not suggesting what they are saying is incorrect but..
So what if the "vibration angle" goes from .225 to .05? Let me state I DO NOT KNOW ok? But sure it looks good in their sale pitch but why is it significant? Crankshafts oscillate and providing there is no nasty resonance I don't understand the issue.

I've read another part of their article:
"Crankshaft driven timing components and oil pump drives can be more susceptible to these high frequency vibrations."
My bold. That looks like marketing speak to me. They don't say "it does" they say "can be". As in might be, possibly, maybe.

Two other points:
1/ There has been no controlled testing of the effect of fitting a solid cp on the FA20 as far as I know and it would not be economically viable to do so.
2/ There doesn't seem to be a high correlation of engine failure with having fitted a lwcp.