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I saw that Unorthodox is putting out their pullies for our civs and i know they give a lot of power compared to AEM. I'm thinking about going with unorthodox but should I assume this is going to pretty much kill my system a far as power goes? Or would getting a gigantic moose size battery help out that loss and make up the difference? If anyone has any thoughts let me know whats up.

 
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are these underdrive pullies? i don't really like them. Your crankshaft deals with 4 power surges, as each of the 4 cylinders fire off. These create momentary stress in the crank and accelerate the crank, then it "coasts on momentum" untill the next power pulse hits the crank. this causes the crank to speed up and slow down, plus it causes vibrations within the crank.

the stock pulley on civics have a harmonic dampener to cancel out these vibrations, and because there is a dampner built into it, it keeps your accesories spinning at a fairly constant, vibration free speed.

an underdrive pulley is a solid piece of metal, and does not have a dampner built into it. it also cuases your accessories at a slightly slower speed, plus the lighter weight of the pully alows the crank to accelerate faster, and with less drag on the pulley side, loose less speed b4 the next cylinder to fires. However, it doesn't dampen out the vibration.

As you know, a "stick" vibrates more at the ends than in the middle. Well, we just removed a dampner from one end. This is going to allow even more vibration.... The end result can be claped out crank bearings..


But there are more serious issues involved in lightened crank pulleys than harmonics, but rather load balance. Lightened flywheels are fine and dandy because the load on the flywheel is directly centered on the axis of rotation -- a lightened crank pulley is dangerous because the load on the pulley is NOT centered on it's axis, but is way off to one side instead.

hth

 
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hmm, im wonderin if i need you to repeat this in LAMENS TERMS...? nah, just messin, but seriously, id like to know some of the actual negative outcomes of puttin the underdrive pulley on....like what exactly will it do to the engine....? will it kill the engine? or will it just throw something out of balance? and in relation to the HP gains compared to the possible negative conseguences, are these pulleys even worth the risk?

 
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SuziQ, you know your stuff! Wow!

 
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If you throw something out of balance, sooner or later it's going to tear up. Besides that if you can't keep your battery charged, that's enough trouble in itself. Might be hard to start or keep your headlights on when you need them.

Of course one could take out the battery, alternator, and all that other useless stuff and save powere and weight, push start, and just drive in the daytime. Hey, isn't that what they do with race cars?

 
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Good post SuziQ! Maybe the Unorthodox Racing crankshaft pulley will come with a harmonic dampener built in as well? If not, then there go my plans!

 
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aem doesn't have a crank pulley or an a/c pulley. Maybe the "balance" wont be affected.

 
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Well yeah, that's what SuziQ said. Only the crankshaft pulley needs a harmonic dampener.

SuziQ: Are you sure that there are 4 power surges? I thought that the middle cylinders fire at the same time and that the outer cylinders fire at the same time? [IMG]i/expressions/face-icon-small-confused.gif[/IMG]

 
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no, they all fire independantly, if they fired at the same time we'd really be scrimpin for power

 
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Wow, thanks SuziQ... that really puts a lot more info into perspective...

hmmm, going to have to rethink that whole home-made wooden pully system now... LOL
j/k

 
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You may be right Susie, i don't know for sure, but after reading the Unorthodox info, from their website, they pretty much say, all their pullies are perfectly balanced and actually are made specifically for each individual application. They claim drivers actually say their engines run smoother with their pullies. And the HP gain comes from not only reducing of the size of pulley, but the weight as well. I think they say each 2.7 pounds of weight is approximate to one HP gain. As you stated, the flywheels, would make the biggest difference. I think their flywheels weigh in around 10 lbs, a substantial difference from stock cast wheels. The flywheels cost around $500 too. I will have to do some more research on that harmonic balancer you stated. That I have yet to hear of. THanks for the info. As far as ICE goes, they claim your alternator will still produce 12 volts, which is the minimum. Now with the standard pullies, its approximately 14.4 volts. They also claim that 700 watt systems or less should be perfectly fine...but again, this is THEIR claim. I hope someone gets these soon and tries them out....

 
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humm thats is a pretty good statement wiht the harmonic dampener!!! Now for the unorthodox flywheel they weigh 8 lbs. which is pretty sweet! i was thinking aobut getting theyr ultrs ss set but now sence my balance meigh be screwd up i'm thinking aobut just leaving the crank pulley off even dhough that is where all the power is the aem pulley set will only give you a gain of aobut 2 hp! the crank pulley is where the most stress is being taken off and you gain power!!! But like zzcivic said i also read that thier pullys are individually balanced for each car and i am not sure what kind of an effect they are having onn our civic but i know on my friends 96 eclipse it gave him some nice gains (ur pully) and he had no problems wiht it what so every except that pople say you might need to exchange our alternator after a while if you run turo set up wiht underdrive pulley cuz it jsut pust too much wear on the stock alternator!! But then again we need a guniie pig to test this underdive pulley ot and see how it is! This on guy on here i think he said he runs the dh-Racing pullye wht turbo set up and he has no problem! So isn't the uR underdrive pullye and dh-racing pulley the same except on the dh you cant keep ac and powersteering but the dh doe not have a harmonic dampener so i dont see whay one would work and the onther would not!!!

 
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hey guy i talk to dh-racing aobut their pully this is the underdrive pully and i asked them if they got one that lets you keep your ac and powersttering and they said YES!!!

this was my e mail to them: now will your pully throw off my balances? sence it doen not have the vibration absorbasion like the civic oem underdrive pulley? I read some articles that if changin your underdrive pulley that it will throw of some harmonic balance and you ac and pwersteering wmight not function properly!!! Does your pully have any longterm effects on an everyday driven car??? And will your pully still function properly wiht the AEM pully kit????

And this is their reply: We run these pulleys all day long and they are perfectly balance so they do absolutely NO damage to your motor. It will still work with AEM pulleys. Let me know if this sounds good. Thanks again
Josh Truex
--- CEO ---
Dave Hickman Racing
High Performance Motors and Parts
(Aol) TITLEXJOSH
(Msn) AllmtrHonda@hotmail.Com
(Cell) AFTER 4 PM PACIFIC- 661-547-1508

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