slowrider94

Is a lighteight crank pulley really bad for your motor? If so why?

ham

ones that arent sfi approved put wear on your engine because they arent balanced perfectly. you can feel slight vibrations as the engine harmonics kick in. stock or sfi approved . to aem and ebay pullies

egsleepercivic

unless your bottom end is balanced, I wouldn't put any pulley on that doesn't have dampner, just because the pulley is balanced doesn't mean your bottom end is

MonkeyBoy668

The only underdrive pulley I'd put on is this, because it dampens out balancing issues.

OTOH you lose power steering and air.

SOHCmaster

Not good at all..they cause serious engine dammage.. i would never run one if I got it for free+ install.

Mushvroom

Unless it's OEM right?

TurboCoop

I wish i knew it was bad for my engine before I put it on. I can barely feel a difference in performance, and the engine does sound different and vibrate a little more. That damn fluid filled one costs like $300 though, and how much less does it weigh than the stock one anyway? Are the stock ones even balanced?

ham

stock ones are 2nd best to the fluid/sfi approved ones. another thing you can do is cut down the stock one for pullies you are no longer using and get it rebalanced

canis

and beside even if you did use them your not gaining anything really off of them anyways... there really not worth for the troublt anyways.. so **** it..

94eg!

iTrader: (2)

The proper way to underdrive your accessories is with new accesory pulleys. The proper way to lighten your rotating assembly is with a lightweight flywheel. If you must have an underdrive crank pully, the best thing to do is shell out the big bucks for a Fluidampr. In fact a Fluidampr dampens crank harmonics better than the OEM damper (wich only works in a certain RPM range).

PS: even if your bottom end is balanced, there are still crank harmonics taking place. Crank harmonics are the flexing of the crank arms from the shock of comustion. It causes them to resonate back & forth. If not controled, it can quickly destroy your oil-pump...

MonkeyBoy668

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94eg! &raquo;</TD></TR><TR><TD CLASS="quote">The proper way to underdrive your accessories is with new accesory pulleys.</TD></TR></TABLE>
You know, I inquired about that back when I bought my UR underdrive pulley set (which I never put on BTW - it's in the big box o' parts I never bothered to install), and was told that nobody made them. I bought the full set and was a little surprised that the accessory pullies were stock size - they were just the crank pulley color. In other words, no value except for bling-bling.

That was 6+ years ago, has anything changed?


Modified by MonkeyBoy668 at 6:28 PM 5/27/2005

O RLY

Fluidampr is the only way to go...don't even play around with Unorthodox and junk eBay brands. FLUIDAMPR

Zeus Zore

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PK SPEED &raquo;</TD></TR><TR><TD CLASS="quote">Not good at all..they cause serious engine dammage.. i would never run one if I got it for free+ install.</TD></TR></TABLE>
well my engine has about 100,000 miles on those AEM ones...
so ?!! i dont really know what you are talkin about... but i would put the money in a flywheel instead.. today.. much more fun !!

but im have AEM and fidenza fly.. so that saved my 15 LBS AT LEAST !

timisyourfriend

too light can also be an issue...

Zeus Zore

ok.. like what ?

timisyourfriend

causing an improper balance to the motor's harmonics...

2-7offsuit

How about the CTR N1 crank pulley? Stock Honda and it only weighs 1.8lbs.

tampajason

damn it

no no no no no!

how many posts are there about these?

they wear main bearings out too fast. Don't do it.

kaoss_11

took the words out my mouth

timisyourfriend

cool for a race car, not cool for a daily driver or anything near it...

eg6sir-s

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowrider94 &raquo;</TD></TR><TR><TD CLASS="quote"> Is a lighteight crank pulley really bad for your motor? If so why? </TD></TR></TABLE>

bump for a great discussion on light weight pulleys

94eg!

iTrader: (2)

No need to bump this discussion. It has been covered 1000 times. CTR pulley is for a race car (and I wouldn't even use it for that), and so are any other pulley that removes the harmonic balance. Why would you spend all that money on a motor, and not want to protect it in every way possible?...?

Zeus Zore

yes this have been covered many times.. as there are opinions..
but as stated before.. i have about 100,000miles in AEM and about 60,000 on flywheel.. ultra light fidenza ! and my total miles is about 201.300 miles