they have a 3-pulley set out now for the EVO, what do you guys think?

anyone had any good or bad experiences with this company in the past?

 

Do a search, it has been covered extensivly. I have the crank pulley and like it, an easy install. I do not see enough of a benifit from the other two for the price.

 

Whatever you do DON'T replace the crank pulley on the EVO unless you find one that still has a torsional harmonic damper in it. A solid pulley is NOT the way to go on the crank.

David Buschur
www.buschurracing.com

 

David, I'm sure you know a lot more than I do on this. The Nissan community has had good success with Unorthodox pulleys, and they claim the Nissans (at least the VQ engine) is internally dampered and that solid pulleys are completely safe.

Can you comment please? Thanks.

Dave

 

Dave is right, don't do it.
then again its possibly an overglorified dsm pulley kit and those are known for tearing thigs up on them as well

 

Amen to that.


On my previous car, I managed to shatter an oil pump gear twice, before I realized it was my lightweight crank pulley.
Expensive mistake.
When the oil pump gear broke, oil pressure dropped; bye bye bearings, bye bye turbo.


There is no harm in replacing the other pulleys, though gains will be minimal, if any.

 

Was this on your Civic? If so, they are plagued with oil pump failure (B Series engines) regardless of what pulley is on the car.

I would respectfully disagree with David on the pulley situation, but as I posted in another thread - ask 10 people, you're likely to get 5 yay, 5 nay. Every engine is different when it comes to this, but on an Evo, the rubber in the pulley is there to absord noise from your accessories...and has nothing to do with the balancing of the engine as it were, as the engines are balanced internally from the factory. So, as long as the item you are putting on to the crank (be it a flywheel or a pulley) is balanced, you will not cause any crank issues.

But as I said before, it comes down to personal preference and which camp you fall into......I know for me, a 2 piece pulley caused problems over time on my $G63, as the rubber seperated from the pulley itself, causing the t/belt to jump, and cause all sorts of issues (thankfully my head was spared).

As mentioned above, the crank is the ones where the gains are - the others are largely for show

 

Yeah it was on the civic.

Not trying to be a smart *** here, but B-series are not plagued by oil pump failures at all. It's very rare situations where oil pumps shatter on a B-series... and when they do, it wasn't a failure on the motor's behalf, it was purely a builders error.

Oil pumps shatter due to excessive vibration as a result of either a lightweight undampened crank pulley or improperly balanced bottom end. ( a lot of people choose to replace the oil pump gear with something like a prodrive unit[i did], but that usually only hides the real problem.)

Tony and the Jotech team were pushing out over 700 hp to the wheels in their B-series motor, they have yet to break a stock oil pump gear.



The gains of a light weight crank pulley can easily be made up anywhere else, and at much less of a risk.

again, my .02...

 

The master has spoken - play at your own risk ! For 2 whp or what ever its not worth walking your crank !

 

[QUOTE]Originally posted by Tofurky
[B]

"Yeah it was on the civic."

....But we are in a quiet different application/engine/drive-belt design, with the 4G63 (in both naturally aspirated or turbo versions, old or new)...

...And the above applies *regardless* of who (whoever) says whatever about these pulleys, in the particular case of the 4G63.

As I have mentioned before, I have more than three years using them in the 4G63 (NA, 1991) and half-year in the EVO's 4G63, and they are working as they have always worked: splendid. , as many, many other users report too.

And those comments about "2 HP gains" are as innacurate as they can get. Nothing better/quicker than easy words, instead of quanititative evidence/support.

Happy racing!

 

Seen it three times in Hawaii 7 bolt cars. Crankwalk! Also 2 6 bolt cars had Trashed crank bearings! The guy switched to a regular pully and the motor was good to go. Just not a good idea. I am making over 500 hp on a stock pulley on my DSM , you just have to check them. I do it every time you change the oil, inspect it for cracks if it is cracked replace it for 69 bux.
My 2 cents

 

[QUOTE]Originally posted by lilgsx
[B]

Seen it three times in Hawaii 7 bolt cars. Crankwalk! Also 2 6 bolt cars had Trashed crank bearings!

...How many times did the owner repaired the engine, installed the pulleys, and repaired it again, before switching to the stock pulley?

Let's see....

 

on one of the 6 bolts he redid it and then up a pully back on it and the crank bearing were trashed within 10000 miles.

 

...That's surely a case that deserves a much closer look, indeed. It would be very interesting to understand what other "stuff" was added/done to the Crank's outer ends (pulleys, flywheel, clutch), as well as to the crank itself, and its bearing assembly, along with any change in engine's lubrication and/or displacement. Also, it would be ggod to know how much power he was trying to make after the re-assembly. If the pulley was from Unorthodox, did he report that to them? What did they do?

In my case, I put more than 30,000 miles on my 6-bolt NA 4G63 (made in 1991) and that thing was up and running like new. The pulley installation was quiet successful, indeed. I also added cam-sprockets and HKS 264 camshafts (no problems, either).

Happy racing!

 

Why would Unorthodox make a pulley kit for the Evo if they knew that the crank pulley would damage the engine?