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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 04-25-2017, 08:42 AM   #1
kyral
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Cant find a replacement oem crank pulley/harmonic balancer

Anyone know where i can find an oem replacement harmonic balancer for my KA?
It seems i can only find aluminum pulleys or a $500 ati super dampener

id really like to use an oem style balancer, anyone know where i could find one?
has anyone used the obx aluminum crank pulley? how well are these balanced?
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Old 04-25-2017, 08:48 AM   #2
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Stay away from the obx aluminum crank pulley as it won't absorb any crank vibration and destroy main bearings
Here's a used one
https://www.partrequest.com/auto-par...t-152407833234
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Old 04-25-2017, 10:42 AM   #3
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Quote:
Originally Posted by Bettywhite240 View Post
Stay away from the obx aluminum crank pulley as it won't absorb any crank vibration and destroy main bearings
Here's a used one
https://www.partrequest.com/auto-par...t-152407833234
Ive also heard that the timing marks on the aluminum ones are off.
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Old 04-25-2017, 10:46 AM   #4
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Old 04-25-2017, 11:29 AM   #5
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Quote:
Originally Posted by Bettywhite240 View Post
Stay away from the obx aluminum crank pulley as it won't asorb any crank vibration and destroy main bearings

This is somewhat misleading. The crank goes through torsional bending, and 1st and second harmonic frequency events.

An inline 4 cylinder crank is fairly short, so torsional or bending stress is actually fairly minimal (relatively speaking). Unlike a 6 cylinder crank which has severe torsional problems (torque is squared based off length) and a second harmonic that occurs somewhere around 6K-6500 RPM. However the 4 cylinder cranks do not suffer from these issue(s). In addition the cranks themselves are full counterweighted and are balanced from the factory and are what absorbs the force generated for compression. You will see only slightly reduced bearing wear by going to an OBX, however I am not entirely sure by how much. But probably not for the lifetime of ownership/mileage. Also, if you lose weight off the snout, you also need to consider losing weight off the flywheel.

In short, you can run an AL crank pulley no problem on a 4 cylinder, generally speaking. However, keep in mind: FWD and RWD have different timing marks


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Originally Posted by kyral View Post
Anyone know where i can find an oem replacement harmonic balancer for my KA?
It seems i can only find aluminum pulleys or a $500 ati super dampener

id really like to use an oem style balancer, anyone know where i could find one?
has anyone used the obx aluminum crank pulley? how well are these balanced?
The SR engine has ended production almost 20 years ago. Unless you find a secret stash, it will be very difficult to find a BNIB harmonic balancer. Check Fontana Nissan maybe??

There is also the GoFastBits crank pulley, but apart from that, the only real other option is ATI. I think fluidampr is also another option, but I have limited knowledge on them and they are probably about the same price as ATI
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Old 04-26-2017, 09:50 AM   #6
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Quote:
Originally Posted by Bettywhite240 View Post
Stay away from the obx aluminum crank pulley as it won't absorb any crank vibration and destroy main bearings
Here's a used one
https://www.partrequest.com/auto-par...t-152407833234
Used ones are no good. they get a groove on the sealing surface. whish is why i need a new one






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rockauto.com
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Trust me i have checked rock auto...
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Old 04-26-2017, 09:58 AM   #7
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Not to step on any toes here, but I would never advise even thinking about running an aluminum crank pulley on any build. I used one and paid that price as well as many of our customers. They're a snake oil scam that only cause more harm than good.
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Old 04-26-2017, 12:34 PM   #8
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Thats the reason this topic is here. i dont want an aluminum pulley.
When youve payed almost 4000 for your engine rebuild you start considering shelling out the money for that $500 fluid dampener because oem units are unavailable.

Im actually about to order a kwik sleeve off rock auto for my old unit, and then jsut reuse that
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Old 04-26-2017, 12:36 PM   #9
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Quote:
Originally Posted by kyral View Post
Thats the reason this topic is here. i dont want an aluminum pulley.
When youve payed almost 4000 for your engine rebuild you start considering shelling out the money for that $500 fluid dampener because oem units are unavailable.

Im actually about to order a kwik sleeve off rock auto for my old unit, and then jsut reuse that
Used OEM is fine if they're in good condition. I paid $35 for a used SR pulley and it has no nicks and perfect rubber. The deals are out there if you look long enough. Also the ATI dampeners are well worth the money if you have it.
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Old 04-26-2017, 01:02 PM   #10
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Originally Posted by hanzbrady View Post
Used OEM is fine if they're in good condition. I paid $35 for a used SR pulley and it has no nicks and perfect rubber. The deals are out there if you look long enough. Also the ATI dampeners are well worth the money if you have it.
the problem with the used units is they always come with a groove on the sealing surface from the old seal. that groove will shred a new seal. im trying the kwik repair sleeve and if that doesnt work out i guess ill have to go fluid dampener
unless anyone on here is selling a used ka24de harmonic balancer with a smooth sealing surface
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Old 04-26-2017, 08:46 PM   #11
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Yep, OEM Or ATI. Avoid all else.
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Old 04-27-2017, 01:54 AM   #12
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Yep, OEM Or ATI. Avoid all else.
I swear some of you guys dont even read the post, or even the title for that matter. I CANNOT FIND AN OEM UNIT
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Old 04-27-2017, 06:57 AM   #13
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I swear some of you guys dont even read the post, or even the title for that matter. I CANNOT FIND AN OEM UNIT
No we did, you had mentioned the OBX pulley and we're all just trying to be very clear to stay away from them. We all have about the same resources finding parts here when it comes to OEM. Your best bet on finding a good condition OEM would be posting in the WTB section here. We're also saying if you can't find one ATI is an excellent option that's well worth the cash.
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