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Old 05-16-2004, 09:46 PM   #1
ej25_pwr
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Default limit of phase 2 SOHC spring/retainer?

i'm working on a budget built up right now. i was wondering what is the power limit of the stock valve springs/retainers before valve float occurs? it seems a lot of people upgrade to twe or cobb springs/titanium retainers. also are the stock retainers strong enough to hold upgraded springs or do i need to upgrade the retainers as well?
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Old 05-16-2004, 10:05 PM   #2
Matt Monson
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I don't know of any vendors who sell springs without retainers, nad you are probably going to save like $50 by reusing retainers. The stock heads will start to float between 6500-7000rpms, and that is partly dependent on how much boost you are pushing as well...
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Old 05-16-2004, 10:10 PM   #3
ej25_pwr
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probably upwards of 10+psi on a sti block. techworks sells springs separate from the retainers.. not sure how well these springs will work with stock retainers.
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Old 05-17-2004, 08:24 AM   #4
Matt Monson
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So,
YOU are spending $1400 of an STi block and then going to skip retainers? There are budget builds and then there are budget builds. I don't mean to flame, But just pay for the Ti retainers. Everything on the EJ25 heads is up to FI use except the spring and retainers...
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Old 05-17-2004, 06:45 PM   #5
White 2.5rs
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yeah if they did separate them itd probably like 100 bucks, and for that kind of drop in mass on moving parts its worth it
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Old 05-21-2004, 09:44 AM   #6
Storm
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I'm currently looking into the feasability of using USDM STi spring/retainers on OEM DOHC 2.5 heads. I know you're looking for SOHC info, but I thought I'd throw this out as an option.

Stock retainers are beefy.....TWE springs should work fine with them, but they would likely be the ones to ask for detailed information.


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