Perth-WRX.com  

Go Back   Perth-WRX.com > General WRXing > General Subaru Discussion
Register Diddy Kart ArticlesAll AlbumsBlogs FAQ Members List Calendar Search Today's Posts Mark Forums Read

ULTREX
Welcome to Perth-WRX, click here to register!

Like Tree346Likes

Reply
 
LinkBack Thread Tools Display Modes
  #231  
Old 10-10-2017, 03:01 PM
type25's Avatar
Sign me up!
Subaru Tech Division
 
Join Date: Jun 2008
Location: in exile
Posts: 1,379
Thanks: 12
Thanked 12 Times in 12 Posts
type25 at standard level
Default

Quote:
Originally Posted by Bram View Post
Ej22 is a proven strong platrorm. Especially with you UK guys. Im actually going down the road of 2.3L EJ. But a destroked cdb ej25.
Great idea.

I have for a long time been keen to build a long conrod, destroked, big bore (100-102mm), sleeved, closed deck with 75mm stroke (EJ207 crank) engine.

High boost + big revs = big grin!
__________________
Reply With Quote
  #232  
Old 11-10-2017, 03:08 AM
dazdavies's Avatar
Sir AntiLag
Member
 
Join Date: Sep 2014
Location: Perth
Posts: 330
Thanks: 8
Thanked 49 Times in 40 Posts
dazdavies knows their stuff
Default

So Ive got the heads off today.

Just looks like the valves have just failed. There is no sign of PTV contact on any of the other three pistons.
Both valves have failed in exactly the same place just before it widens out to the head.
There's no sign of Det or anything heat related.

So pissed off about this one as I have gone to great lengths to make sure it didn't happen again.
proper valves double springs, hardened steel retainers, a conservative 7800rpm rev limit and 1.1mm gaskets.

Really really pissed off this time.













__________________
605whp
Quarter Mile in 10.9 seconds @ 135mph /217kph
0-100 kph 3.2 seconds
Reply With Quote
  #233  
Old 11-10-2017, 07:26 AM
nauli's Avatar
Perth WRX Old Skool Cool Dude
Member
 
Join Date: Jul 2005
Location: Perth
Posts: 3,738
Thanks: 2
Thanked 64 Times in 59 Posts
nauli knows their stuff
Default

Bummer Daz...especially after all your diligent work...but a rebuild is always an opportunity! Good luck...
IanJ and Soksta like this.
__________________
MY06 STI Spec C tarmac rally car - SOLD
2016 MkIII Ford Focus RS - Nitrous blue with forged rim package
2012 Nissan Pathfinder.
1969 Renault Alpine A110
Reply With Quote
  #234  
Old 11-10-2017, 08:14 AM
Hurtenstein's Avatar
Subaru Tech Division
Member
 
Join Date: Mar 2006
Location: C to tha V
Posts: 1,691
Thanks: 0
Thanked 6 Times in 5 Posts
Hurtenstein at standard level
Default

Hows the bore?
__________________
Balls.
Reply With Quote
  #235  
Old 11-10-2017, 10:48 AM
Potty Training Scoobie Noobie
Member
 
Join Date: Mar 2011
Location: Australia
Posts: 48
Thanks: 0
Thanked 0 Times in 0 Posts
deejw is unrated
Default

Wow those valves have been having a party in there.
__________________
New Foz Build http://ozfoz.com/forum/viewtopic.php?f=12&t=43042
Reply With Quote
  #236  
Old 11-10-2017, 12:01 PM
STI Master
Member
 
Join Date: Oct 2010
Location: Spearwood
Posts: 786
Thanks: 9
Thanked 59 Times in 58 Posts
Bram knows their stuff
Default

Wow. Interesting the point that the valves broke at. I always pictured them braking at the end where the collet/retainer connects.

Do you think it could be related to the double springs? Have you had a chance to individually measure the spring pressure of those springs vs the rest?
__________________
Doing it for all the wagons out there
Reply With Quote
  #237  
Old 11-10-2017, 01:52 PM
dazdavies's Avatar
Sir AntiLag
Member
 
Join Date: Sep 2014
Location: Perth
Posts: 330
Thanks: 8
Thanked 49 Times in 40 Posts
dazdavies knows their stuff
Default

Thanks to Leigh from Deshele performance we've come to the conclusion it's valve to valve contact that's done it. I've always thought the engine was slightly noisier after my drag strip visit but until now just though I was imagining things.

Something Leigh said (without knowing about the noisier engine) has confirmed my suspicions. We think it's valve float when hitting the limiter that's done it.

On the drag strip I hit the limiter in 4th at 135mph about 10 meteres before the line. I think this has been the point where the inlet and exhaust valves have hit each other and bent slightly. Then they've just fatigued over time.

I'm not going to buy supertech again. I've read a few posts by some quite serious engine builders who have switched to Ferrea valves as they tend to just bend rather than break.

I'm also going to raise the limiter from 7800rpm to 8500rpm. That will get me across the line without limiter bashing. It's not the rpm that's done this it's the float when the limiter kicks in.

Block is possibly salvageable, bottom end looks to be good too apart from the pistons of course. Ill know for sure when i split the block later.
AWDmoke, DZENCI, TROLLEY and 3 others like this.
__________________
605whp
Quarter Mile in 10.9 seconds @ 135mph /217kph
0-100 kph 3.2 seconds
Reply With Quote
  #238  
Old 11-10-2017, 06:45 PM
DZENCI's Avatar
WRX Hi Five Club
Member
 
Join Date: Nov 2007
Location: Perth
Posts: 274
Thanks: 7
Thanked 10 Times in 10 Posts
DZENCI at standard level
Default

I really hate seeing things like that but knowing you, you'll always come back bigger and better. The workmanship you apply to all your builds is always top notch.

Can't wait to see what combo you end up with next. Also when you do end up putting the long motor together, do it like the old times with lots of pics and details.

Good luck Daz
Reply With Quote
  #239  
Old 12-10-2017, 05:30 PM
dazdavies's Avatar
Sir AntiLag
Member
 
Join Date: Sep 2014
Location: Perth
Posts: 330
Thanks: 8
Thanked 49 Times in 40 Posts
dazdavies knows their stuff
Default

Yeah, If the block is goosed I'm going to do an EJ22T build. I've built them for other people just never for myself. They are supposed to be just awesome and better than the EJ25 option because it revs so well.

If I do that I'll document the whole build from start to finish.
XT43, TROLLEY, Startodo and 1 others like this.
__________________
605whp
Quarter Mile in 10.9 seconds @ 135mph /217kph
0-100 kph 3.2 seconds
Reply With Quote
  #240  
Old 12-10-2017, 07:37 PM
STI Master
Member
 
Join Date: Oct 2010
Location: Spearwood
Posts: 786
Thanks: 9
Thanked 59 Times in 58 Posts
Bram knows their stuff
Default

Quote:
Originally Posted by dazdavies View Post
Yeah, If the block is goosed I'm going to do an EJ22T build. I've built them for other people just never for myself. They are supposed to be just awesome and better than the EJ25 option because it revs so well.

If I do that I'll document the whole build from start to finish.
Ever considered an ej25 block with ej207 crank and custom longer rods? Short stroke of a 207 and even taller rod/stroke ratio than that of a 207 with a bit more displacemnt aswell. Will rev like crazy and still with enough displacemnt to keep you smiling. Once you have either sleeved or CDB the ej25 then its not such a bad setup. Especially if finding a good condition ej22 block thats un-mollested is becoming more difficult.

You mentioned doing ej22 stroker. Once you put the 79mm crank in an ej22 your moving away from the short crank that gives it its good revving qualities in the first place. And still end up with the same displacement as a de-stroked 25.
__________________
Doing it for all the wagons out there

Last edited by Bram; 12-10-2017 at 07:46 PM.
Reply With Quote
Reply

Tags
10, hawkeye, oem reliability., reliable ej25

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Evo 10 HKS/ARC/Misc bits Captain Awesome For Sale 13 15-12-2012 02:48 PM
Subaru introduces WRX Club Spec 10 for Australia rss.feed General Subaru Discussion 0 08-04-2010 10:20 AM
Boost Juice BOMB3R Non-WRX Discussion 56 16-01-2007 07:05 AM



Welcome to Perth-WRX, click here to register!

All times are GMT +8. The time now is 07:34 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO