is the unorthodox racing pulleys safe to use? i have heard horror stories about them and the eclipses but i was just wondering what you guys who have used them or have them think! btw i have a 00 celica gts.


thanks guys

 

bumped, anyone ????

 

From my website:
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Here’s what AEM says:

“Vehicle manufacturers have thoroughly investigated the use of torsional vibration dampeners and conclude that their use significantly reduces NVH (noise, vibration and harshness). Furthermore, manufacturer and independent research shows that torsional vibration dampeners are critical to engine life where long-term use is intended. Removing the torsional vibration dampener from an engine can be highly detrimental to its long-term operation!”

Now here's what a real automotive engineer says:

“I talked to an engine builder who builds high performance V8s. He occasionally builds engines without vibration dampers, but only for hill climbing / sprinting. He recommends that the crank is replaced after no more than 4 seasons racing due to the fact that it will eventually fail. The overall milage covered is therefore very low over 4 seasons.

I've been checking out every other possible lead that I have and one of the most interesting is the fact that <mfg name removed> will use the production damper on the new V6 racing engine. The engine is based around a production block and crank and will be used for circuit racing. The milages will be higher than sprinting but not so great. The engineers think that the damper can be improved slightly, (probably reduced mass), but not deleted altogether. This is interesting because with a 6 cylinder engine or multiples of 6 it is possible to achieve perfect primary and secondary balance. The pulses through the crank from each cylinder is what is clearly being damped as you probably already knew by now.

A failure related to the damper will result in a broken crank, possible pressure plate etc rather than bearing damage. I think that any failed bearings etc are as a result of general abuse and not down to the vibration damper.

I think that it is clear that any vehicle that will cover moderate milages should have a vibration damper to prevent the risk of crank failure.”

Well there you have it. Seems like a good case to keep it on, unless it's a low milage engine...

 

yes, this has all been said, but i wonder if the motor iw balanced with the pulley (complete with flywheel, clutch assembly, etc.)?

 

I have the unorthodox racing pulley on my CRX si and i love it , Have you ever weighed a stock pulley , those weigh a ton .

 

dont bother. there are other things to modify to make more hp.

 

i've heard bad things as well. But have also heard of people that love them and have had success. its your own chance, i say don't get one and just put the money elsewhere.

 

From my research (10-12 months ago) Both of the people I trust recommended Unorthodox Racing Cam Gears. Their design was obviously superior to other brands. I don't know if the same is true of their pulleys; I'll wager thatthey are of superior design / quality also.

Side note: I've am disenchanted with AEM. I have had two of their bypass valves break on me. The first AND second design they released. Obviously product QA testing is not in AEM's product development cycle. I'd never trust my engine to any of their products.

 

i have all three pullies on my 98 LS with B18B and i love them also. My brother and my 2 friends all have nissan's, my brother has the sr20de and he loves them, and both of my friends have the turbo sr20det and they think they are great also.

 

i think unorthodox builds there pullys to stock spec the difference is just wieght. this allows no alternator charge loos and you can still use oem belts,......
other companys (like AEM) use enlarged pulleys which doesn't seem to smart and you can't use oem belts...

i think unorthodox is the way to go.. im looking in to getting a set once i get a few more mods on my car.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ambition &raquo;</TD></TR><TR><TD CLASS="quote">...i think unorthodox builds there pullys to stock spec the difference is just wieght...</TD></TR></TABLE>

You know not of what you speak. The UR pullies are nothing like the stock part, which have two separate pieces separated by a rubber ring. The rubber provides a "mechanical filter" for the torque pulses. The UR is aluminum. Nothing in common other then being round.

They work for some people and not others. While I suspect some of the "failures" are attributed to other problems, there does seem to be something to the claims of it stressing the crank more.

 

Remember that the OEM Honda CTR N1 pulley doesn't have a dampener....

 

LONG TERM,

is that 120,000 miles or 200,000miles ++

it sure ain't 20k ... which this motor willonly do before the next teardown so why bother ?

 

Stock works just fine... NO Harmonic Balancer ='s BAD BAD BAD... It's just extra vibration/stress on your bearings and oil pump... Just my $0.02, latez

 

ctr N1 B16B
that motor is internally balanced from honda. B18a's aren't

 

So in a nutshell for a B18:
crank pully w/ no balancer (ie unorthodox pully) = BAD mojo

Even though UR claims "Unorthodox Racing has been manufacturing and selling pulleys for over 5 years without a single engine failure due to the replacement of the stock crank pulley."

You read through the UR site and there is nothing but claims that there is no such problems with their pullies.
It's one of those deals were it sounds to good to be true.
This is frustrating.......