Evans stage 1 valvetrain builds, a worthy upgrade for a high boost s2000?
10-23-2011, 03:23 PM
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Evans stage 1 valvetrain builds, a worthy upgrade for a high boost s2000?
Just curious to get some feedback, but Evans does top end builds for Honda B,K, and F series engine. A stage 1 valvetrain freshening and upgrade with 7 angle valve job, titanium retainers, all kinds of things to help it breath better is 1,250 dollars. What improvement could be expected on your typical 360+ rwhp supercharged AP1.
10-23-2011, 03:32 PM
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Despite owning the car for a year and doing some pretty worthy mods, there is so much more I wish I could learn about the car, the engine in particular, differential info as well and suspension too!
10-23-2011, 04:12 PM
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A search through google found me plenty of answers and the ultimatum is that there is very little improvement that can be made on F20/F22 heads, and going to the trouble yields very little improvement. Don't know about cams, valve springs, and titanium retainers. Don't really know, but valve jobs and port/polishing doesn't seem to make a big difference in terms of flow.
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10-24-2011, 05:53 AM
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Upgrading can prevent these issues, especially for no more than it costs.
10-24-2011, 05:58 AM
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Originally Posted by Cody Strife' timestamp='1319463779' post='21095701
What are the benefits of new valves and springs, obviously retainer replacements are a must and I'm doing that soon. (ap2 retainers)
Upgrading can prevent these issues, especially for no more than it costs.
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10-24-2011, 11:42 AM
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Depending on design, they can flow a titty bit more air. Not much.
Less likely to heat and break
Lighter weight
Better springs and TI retainers:
Can rev your engine higher assuming the bottom end stays together because of the higher spring pressure. This prevents valve float which could lead to piston to valve contact in the high revs. But this also puts more stress on the valvetrain with the added pressure.
Lighter weight.
As a combination, like said above, you can run a 2 step with much less worry of dropping a valve. Aftermarket springs and retainers will also not last as long as OEM equivalents so you will need to keep an eye on them after many miles by removing the valve cover and just looking at them.