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Old 05-04-2006, 05:28 PM   #1
not8player
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Default What is the upper limit HP for the stock (phase 1 2.5 DOHC) connecting rods?

I have search and haven’t been able to find a clear answer/opinion.
The reason for my question I am interested in building a “Hybrid - EJ22T block w/ EJ25 DOHC head, Crank and Rods”

What is the upper limit HP for the stock (phase 1 2.5 DOHC) connecting rod?
At what HP/torque/RPM do they become the week link?

Thank you
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Old 05-05-2006, 05:20 PM   #2
Matt Monson
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350chp...
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Old 05-05-2006, 07:49 PM   #3
bboy
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They are cast rods aren't they. I would think not much. You should be able to find some STI rods from people that have upgraded like me.
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Old 05-08-2006, 12:48 PM   #4
not8player
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bboy,
The STI rods won't work with the phase 1 Ej25 crank.

Matt,
Is your conclusion based on rods failing at 350chp levels or just the stock engines? I should have been more specific in my question, I am planning to putting wiseco pistons and I am debating in regards the connecting rod. My power goals are not high (280chp-330chp) but I want a reasonable safety margin.

Last edited by not8player; 05-08-2006 at 02:07 PM.
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Old 05-08-2006, 10:26 PM   #5
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if you'd like a good safety margin, check out TWE. they have a section of their "latest news" that shows cryo-treated stock rods they say handle 30% more power than a stock rod. I'm looking into them myself as an alternative to $1000 sets of rods... ($270/set FTW)
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Old 05-08-2006, 10:58 PM   #6
not8player
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Very interesting. It took me a while to find it here is the link for others that want to read it
http://www.techworkseng.com/News/Releases/05-01-05.html

That seems to be a reasonable option. Now I just have to catch up with some reading in regards cryo-treating I know it has been discussed for our tranny gears.
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Old 05-09-2006, 01:07 PM   #7
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The phase 1 rods are longer. You can buy longer rods from Pauter and Cobb and probably others. If you are building a high HP car on the Phase 1 platform you have little choice but to go with forged rods.

You can use the STI rods on that motor but you have to change the piston so that the quench is preserved. I "think" that's what the 2.35L block you see are.
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