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Originally Posted by preludejtstyle
I'm looking for a list of available valvetrains for the H22a/H22a4/H22a1 (all the same)
So far:
JDM
Skunk2
Crower
Ferrea Valves
Anyone else?
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Well, one thought is to pick all the valvetrain parts yourself. Strictly speaking, there is no absolute need to use the same brand for all the v-t parts.
Supposedly Crower now has special Ti retainers that don't wear like other Ti retainers. They don't fatigue over time, which is real cool. Ordinary Ti retainers fatigue over about 30k miles, which most people don't know. Todd (marcucci) originally made a post about this some years back. I would go with those if I needed a new v-t.
If you really know what you are doing, you can choose your springs manually. You can tell from your cam lobe profile how aggressive a spring you need. In practice, you need the softest spring that allows the tappet to follow the cam lobe at, say, 9k RPM. That means you won't have valve float at 9k RPM if you over-rev. I know that Rocket motorsports used to have springs available by spring rate, and Rocket even figured out how many lbs spring you needed for most cams. You will have to do some reading over on his board though, because it's been awhile since I looked that up.
As far as valves, the are mostly the same. The only ones I see that are different are backcut valves. Back-cut valves have a thinner, curved stem right before the head, which allows greater airflow past the valve head at low lifts. This will give you a small bump in torque.
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