Welcome to the North American Subaru Impreza Owners Club Saturday December 7, 2019
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

Notices

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 07-24-2010, 02:32 AM   #26
Murphdog
Scooby Specialist
 
Member#: 75414
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Rock Springs,Wyoming
Vehicle:
2004 STi
Its the Blue one

Default

I have the ATI. Fit and finish is perfect, and after 10,000 miles on the built motor no problems and the Sticker is still on straight
* Registered users of the site do not see these ads.
Murphdog is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 07-25-2010, 05:34 AM   #27
masterx81
Scooby Newbie
 
Member#: 217747
Join Date: Jul 2009
Chapter/Region: International
Location: Asti - ITALY
Vehicle:
1998 Impreza WWW v4
Blue!

Default

Ok, it's a dampener (or, more precise, an absorber...), but i've seen this sort of pulleys with similar mass on engines with much longer/less stiffer crank (lower resonance frequency), and on this engines some sort of torsional absorber is needed for not waste power of shorten the crank life.
But on the subaru crank, that it's so short i would doubt that a dampener can do something. With much probability the resonance frequency of the crank is so high that it's out of the useful rpm range, and out of the frequency produced by torsional vibrations.
Plus, a torsional absorber made with rubber and inertia ring seem that can be tuned to work only on a narrow range of frequencies (maybe with dual mass this range can be extended a bit?), on other frequency (half or double) actually it can be worse.
It's interesting to see that also inertia of the alternatig engine parts varies the torsional resonance frequency, so the dampener must be matched with the engine. At least, the dampeners made with rubber and inertia ring.
So, a simple pulley bolt on the crank can actually hurt on crank's life, but a well engineered one maybe can't hurt
There is a good reading on the subject:
http://www.epi-eng.com/piston_engine..._absorbers.htm
masterx81 is offline   Reply With Quote
Old 02-28-2011, 01:56 AM   #28
caterpill
Scooby Specialist
 
Member#: 27136
Join Date: Oct 2002
Talking

I don't mean to bump an old thread from the dead for nothing, but I couldn't really come to a conclusion from the presented information.

I got an old peanut-eye with about 115k on the odometer and I had a thought the other day while working on my 98' outback with 200k on the odo - the crank pulley is a damper made out of rubber or some sort of elastomeric material, and of course, it won't last forever.

I figured if I decide to go back under my cam covers later on in the future, i'd probably replace the crank pulley with something "better".

I've reviewed many posts reguarding the lightweight crank pulley debate complete with engineering articles straight from fuji heavy, and to avoid any bearing issues i've decided not to even consider a solid pulley - to each their own. However, I would like to determine if the Fluidampr line of crank pulleys are OK to use. Fluidampr pulleys are specified as using a silicone fluid that does not require servicing or replacement . . . forever?

I guess if it comes down to it, why not buy an OEM damper? But if I can buy something else that is BETTER for about the same price, i'd rather buy that.

Any thoughts?

Thanks in advance.
caterpill is offline   Reply With Quote
Old 02-28-2011, 10:11 AM   #29
cnstman
Scooby Specialist
 
Member#: 9548
Join Date: Aug 2001
Chapter/Region: RMIC
Location: Colorado Springs
Vehicle:
2004 WRX STi
10.154 @139 @ 7,000'DA

Default

cnstman is offline   Reply With Quote
Old 05-02-2014, 10:45 PM   #30
5ubZeR0
Scooby Newbie
 
Member#: 307553
Join Date: Jan 2012
Chapter/Region: MAIC
Location: Fairfax Station, VA
Vehicle:
'11 STI & '04 WRX
DGM & PSM

Default

Quote:
Originally Posted by cnstman View Post
tell you what, you print out those stats and hold them in your hand and tell me which one has a better build quality.

me on the on the other hand, I have physically held each of these products in my hand, and I stand my my statement that the Fluidampr has a higher build quality.
Damn...this is on OLD thread but... You say that only because the Fluidampr feels heavier due to it's steel construction. I'm looking at both of them right now and they are both well built but the ATI is almost identical in weight to the stock crank pulley where the Fluidampr is a few ounces heavier which IMO actually puts more stress on the engine due to it's weight increasing rotating mass.

Last edited by 5ubZeR0; 05-02-2014 at 11:04 PM.
5ubZeR0 is offline   Reply With Quote
Old 06-23-2015, 11:58 PM   #31
methaddict
Scooby Specialist
 
Member#: 159738
Join Date: Sep 2007
Chapter/Region: SCIC
Location: SGV
Vehicle:
2004 WRB STi 620awhp
OFCD V3, FR TS, BW8374EFR

Default

Does the ATI require a larger AC belt size? What length or part number for a Gates belt?
methaddict is offline   Reply With Quote
Old 06-28-2015, 03:20 AM   #32
Razgeiz
Scooby Specialist
 
Member#: 358782
Join Date: Jun 2013
Chapter/Region: MWSOC
Location: Springfield, Illinois
Vehicle:
2013 STi
DGM

Default

No its the same size. Wait... I forgot your flipped manifold and don't have room to play.

Might not be close enough. Idk how much adjustment you have. I have roughly 1/8th inch
Razgeiz is offline   Reply With Quote
Old 06-28-2015, 04:03 AM   #33
methaddict
Scooby Specialist
 
Member#: 159738
Join Date: Sep 2007
Chapter/Region: SCIC
Location: SGV
Vehicle:
2004 WRB STi 620awhp
OFCD V3, FR TS, BW8374EFR

Default ATI, fluidampr crank damper ???

Yeah for the AC belt in the Gates brand it is K040353 or if you want the blue racing version add RB to the end.
methaddict is offline   Reply With Quote
Old 12-20-2015, 12:17 PM   #34
KinkSti
Scooby Newbie
 
Member#: 414850
Join Date: Mar 2015
Chapter/Region: South East
Location: South Florida
Vehicle:
2004 WRX STI
Silver

Default

Quote:
Originally Posted by Sinister redlines View Post
Yes, but does yours have a 2.71L sleeved forged engine inside???

Just kidding, good choice in parts...


I also find it VERY funny that again here is proof to the likes of the info here. Thanks for the posting of the page. But alas I bet the argument will continue and there will be the bone heads who just wont see it LOL....
So with a stroker, what damper pulley crank pulley you recommend?
KinkSti is offline   Reply With Quote
Old 12-21-2015, 01:31 PM   #35
Razgeiz
Scooby Specialist
 
Member#: 358782
Join Date: Jun 2013
Chapter/Region: MWSOC
Location: Springfield, Illinois
Vehicle:
2013 STi
DGM

Default

Fluidamper
Razgeiz is offline   Reply With Quote
Old 12-23-2015, 01:57 PM   #36
Flat 4 Motorsport
Former Vendor
 
Member#: 295846
Join Date: Sep 2011
Chapter/Region: MWSOC
Location: Crook County, Illinois
Vehicle:
WRX FP HTA GT3076R
Sexual Chocolate

Default

Fluidampr.

You never have to send it in to be rebuilt/certified.

It's a sealed unit, so no issue with the inertia ring/silicone fluid degrading.

Great customer service!

Him me up, and I'd gladly quote it out for you.

-Phil @ F4M
Flat 4 Motorsport is offline   Reply With Quote
Old 12-23-2015, 02:09 PM   #37
Zombie Panda
Scooby Specialist
 
Member#: 425346
Join Date: Jul 2015
Chapter/Region: South East
Default

This thread is 5 years old and the OP has been banned.
Zombie Panda is offline   Reply With Quote
Old 10-29-2019, 11:48 AM   #38
pcampbell
Scooby Specialist
 
Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

Default

Anyone got an ATI damper hanging around and can confirm the diameter (preferably on top of the ribs, not the flange) ? It is listed as 5.5" and the stock is more like 5.22" - for someone running a supercharger this is actually very appealing. It will give me about +1.5psi without any additional risk of belt slip.
pcampbell is offline   Reply With Quote
Old 10-31-2019, 12:15 PM   #39
car_freak85
Scooby Specialist
 
Member#: 13530
Join Date: Dec 2001
Chapter/Region: NWIC
Location: Cascadia
Vehicle:
EA63 , EA81T, EJ20G,
EJ205

Default

SuberDave has an ATI on his EA82 drag wagon.
car_freak85 is offline   Reply With Quote
Old 11-01-2019, 07:22 AM   #40
pcampbell
Scooby Specialist
 
Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

Default ATI, fluidampr crank damper ???

Thanks. Ati tech replied confirming its overdrive and diameter is indeed 5.5Ē. For me this is a good thing because itíll give me another 15whp or so out of my sUpercharger. Much better than running a smaller SC pulley.
pcampbell is offline   Reply With Quote
Old 11-18-2019, 11:19 AM   #41
pcampbell
Scooby Specialist
 
Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

Default ATI, fluidampr crank damper ???

I have one more question about the ATI pulley. How do you hold it still to tighten and remove l - will a regular Company23 crank pulley tool work with it? It has 3 holes in it, not 4.

Also wondering if it can be installed on vehicle. Iíve heard the fit is tight.

Last edited by pcampbell; 11-19-2019 at 08:14 AM.
pcampbell is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fluidampr Crank Pullys Just Released! In Stock @ P&L! P&L Motorsports Inc. Engine/Power/Exhaust 4 01-19-2009 06:31 PM
FS - CA - NEW ATI Performance Super Damper Crank Pulley Drag-On Engine/Power/Exhaust 2 09-15-2008 11:10 PM
FS - LA - NEW ATI Performance Super Damper Crank Pulley Drag-On SCIC Private Classifieds 1 07-07-2008 01:55 PM
ATI Dampers.....finally 99RSTurbo Built Motor Discussion 19 01-07-2008 09:51 PM

All times are GMT -4. The time now is 05:25 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.