22t valve size versus na

jefferson · Post by **jefferson** » Mon Feb 18, 2013 10:09 pm

I was reading about the history and specs of the ej series motors and I came a cross something I had not heard about. I read the statement that the intake valve size was reduced to 27 mm in the turbo motor and I was wondering if anyone has confirmed this and also why would they do such a thing. I don't see the benefit of it.

Jeff

matt00rs25 · Post by **matt00rs25** » Tue Feb 19, 2013 12:03 am

Supposedly a na Dohc head will flow much better than the turbo head. I intend on swapping over to it. How's the sohc compare to the Dohc heads?

jefferson · Post by **jefferson** » Tue Feb 19, 2013 1:29 am

I am just talking about the 2.2t versus the 2.2 na. Both are sohc.

James614 · Post by **James614** » Tue Feb 19, 2013 6:45 am

The turbo engine likely has smaller valves to aid low-end torque and maximize off-boost response.

Post by **Legacy777** » Tue Feb 19, 2013 6:55 pm

I've read the same thing, but have not confirmed it. What I can tell you is that Subaru lists different intake & exhaust valve part #'s for the turbo & non-turbo ej22's.

mike-tracy · Post by **mike-tracy** » Tue Feb 19, 2013 11:16 pm

If someone has some n/a heads to measure, I'll measure some scrap 22t ones.

matt00rs25 · Post by **matt00rs25** » Wed Feb 20, 2013 1:06 am

I've got a set of na sohc heads from my spare 2.5 rs motor. Ill being home my caliper gauge.

Alphius · Post by **Alphius** » Wed Feb 20, 2013 1:48 am

That won't be a good comparison.
We would need some Phase1 SOHC EJ22 heads to compare.

matt00rs25 · Post by **matt00rs25** » Wed Feb 20, 2013 2:39 am

Aww. Well count me out then!!

Someperson · Post by **Someperson** » Wed Feb 20, 2013 4:06 am

imma be ripping my NA out come april, i can measure then

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