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Old 04-13-2009, 10:59 PM   #26
SlickRick51586
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Quote:
Originally Posted by FuJi K View Post
That's with stock WRX/STi rod length?
130.5mm, center to center
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Old 04-13-2009, 11:10 PM   #27
silver arrow
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When I go with a bigger turbo in my 08, this sounds very interesting.

I have a set of CP pistons already, so +2mm forged rods, and an EJ207 crank will allow me to run 8000+rpms? What about valve float? Would I have to upgrade the springs and valve train?
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Old 04-14-2009, 09:06 AM   #28
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just slapping a +2mm rod and some STi pistons won't allow you to run 8000 rpm....it does relieve some stress from the rod bearings IF you are careful about rod and piston weight.

A long rod design just shifts the torque curve (volumetric efficiencies) to the right. the longer the rod, the more 'free' RPM's you can get from the motor and the more top end power you'll have.

You still need to address oiling mods (bearings, pump, cooler, etc for extended rpm use) as well as cylinder head flow; be it port job, valves, cams or all of the above and of course stronger valve springs so you don't float your valves and have a catastrophy.


Anyone intersted in this should first read:
http://forums.nasioc.com/forums/show...ing+crankshaft
http://forums.nasioc.com/forums/show...ing+crankshaft
http://forums.nasioc.com/forums/show....php?t=1181857

and for the sake of spool up, as long rod won't and can't be as good as a shortrod motor...
http://forums.nasioc.com/forums/show....php?t=1228477

oh and lastly, don't forget about cam LSA and LCA for a long rod. Also be certain to clay the setup to check for proper piston to valve clearance. There is a reason I'm not running AVCS.

Last edited by Homemade WRX; 04-14-2009 at 09:16 AM.
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Old 04-14-2009, 11:03 AM   #29
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So is it possible to run AVCS with a long rod setup?
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Old 04-14-2009, 11:32 AM   #30
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you can but pending cam, piston and valve...the amount of adjustment you will have will be limited.
I'd say unless you know how to do your homework, let someone else do it for you
Part of why I'm telling people to do some reading and understanding if they really wanna do it on their own. Turbo mike and Bamofo both were at running with an extra 2mm of clearance due to their stock rod length.

For my particular build with my large custom cams and little room in the piston for valves and +1mm valves; AVCS would have been near pointless...so I elminated it as a reliability and to conserve oil pressure for the bearings.

With certain cams and piston's designed with ample valve relieves; AVCS would definately be usable. I actually do want to get my AVCS up and working on my setup sometime after september. IIRC from my piston to valve checking, I have about 7* of adjustment (not much).
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Old 04-15-2009, 07:27 PM   #31
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im going to copy bamofo's list most likely just with a updated ej205 crank. Bamofo, if you could pm me with any specifics left out i would REALLY appreciate it. As far as the list given, let me know if theres anymore specific about the build I should know or change?



Homemade - Im still curious of your price of the componet kit from the group buy. LMK how much it comes out to be.
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Old 04-15-2009, 09:30 PM   #32
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it'll be coming soon and pends on how many people are buying in...the more, the cheaper I can make the prices.
As Bamofo will tell you, there's more to it than simply a list of parts
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Old 04-20-2009, 02:55 PM   #33
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I am interested, please PM me prices and info
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Old 04-20-2009, 03:55 PM   #34
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I am interested, please PM me prices and info
+1
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Old 04-20-2009, 07:39 PM   #35
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prices won't be getting pm'ed...don't need to be in bad graces while my vending account paperwork is going through

thanks for the interest though.

-Micah
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Old 04-20-2009, 08:53 PM   #36
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Quote:
Originally Posted by Homemade WRX View Post
prices won't be getting pm'ed...don't need to be in bad graces while my vending account paperwork is going through

thanks for the interest though.

-Micah
okay good, you got an email
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Old 04-20-2009, 11:04 PM   #37
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well, that's not what I meant but I guess that works
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Old 04-21-2009, 06:01 PM   #38
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Can I use a EJ22T crank for the destoker build? I just noticed that the EJ20 and EJ22T cranks both have a stroke of 75mm. I think the rod journals may be narrower on the 22T. Anyone?
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Old 04-21-2009, 06:07 PM   #39
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Quote:
Originally Posted by hustleshark206 View Post
Can I use a EJ22T crank for the destoker build? I just noticed that the EJ20 and EJ22T cranks both have a stroke of 75mm. I think the rod journals may be narrower on the 22T. Anyone?
I think the bearing setup is different and that crank potentially would only work in a Phase I 2.5 (correct as required please)
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Old 04-21-2009, 06:18 PM   #40
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Thrust bearing is #5 on the block and #3 on the EJ22T crank. Thats right. Plus the oiling timing is probably different. Probably easier to find someone who would trade a EJ22T crank for a EJ20 crank.......

Anyone?????
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Old 04-21-2009, 09:01 PM   #41
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Quote:
Originally Posted by hustleshark206 View Post
Can I use a EJ22T crank for the destoker build? I just noticed that the EJ20 and EJ22T cranks both have a stroke of 75mm. I think the rod journals may be narrower on the 22T. Anyone?
Both cranks are the SAME stroke and journal sizes. The difference is the thrust bearing location. That's it. Oiling holes are the same. The revised WRX crank are the ones with double cross drilled crank journals.

The only crank with the smaller "diameter" rod bearing journal are the phase1 2.5L DOHC NA motors. Phase2 2.5L DOHC NA motors went with the phase2 crank and newer rods, however retained the phase1 heads; which are found in the '99 Legacy 2.5GT and Outbacks.
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Old 10-09-2015, 08:23 PM   #42
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I'm curious, do the stock (ported ) ej205 heads flow enough for the 2.35 destroyed motors? (+2mm) contemplating this or a stroked 2.1, just thought I'd ask, because searching didn't help me, nor Google.

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Old 10-09-2015, 09:12 PM   #43
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You'll want to do cams and valvesprings at the least, to take advantage of the revs, assuming you have a turbo to flow for the RPM.
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Old 11-02-2015, 07:56 PM   #44
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So I am going this route on my 05 lgt should I use the cams from a 2.0 liter instead with gears to eliminate the avcs. I mean technically at high rpm that these engines run, isn't it somewhat useless?
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Old 11-05-2015, 12:52 AM   #45
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what kind of bearing clearances are you running to rev above 8,000 ?
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Old 11-07-2015, 04:09 AM   #46
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Quote:
Originally Posted by wrx1392 View Post
what kind of bearing clearances are you running to rev above 8,000 ?
For a mix of street and spirited driving, 0.0015" for the mains and 0.002" for the rods. I would have the case halves once bolted together checked for the line bore straightness from main # 1 - # 5 so oiling is consistent.
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Old 11-07-2015, 10:56 AM   #47
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Some 2.34 tach action.
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Old 09-16-2020, 01:10 AM   #48
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Anybody care to talk more about destroked 2.5's?

I am rebuilding my 257 and my builder just brought the destroked option to my attention. I like the reliability factor that I am reading. Car is being built for the track but dd as well. Goals are not absurd, aiming for 450 hp, short block will be fully built.

Thanks for any information.
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Old 09-17-2020, 03:58 PM   #49
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+1 on more information, could more on the tuning be shared as well? I am getting some killer deals on parts and may build or sell off depending on how i feel about it all!
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Old 09-17-2020, 07:13 PM   #50
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Originally Posted by PlayersLtd View Post
Anybody care to talk more about destroked 2.5's?

I am rebuilding my 257 and my builder just brought the destroked option to my attention. I like the reliability factor that I am reading. Car is being built for the track but dd as well. Goals are not absurd, aiming for 450 hp, short block will be fully built.

Thanks for any information.
What turbo? 450whp or crank? What model year, transmission choice?
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