K20A2 Head vs. K20A3 head

[Type R Special]

i think this picture might help a few people

on both exhaust side on op, intake on bottom

[method:B18C]

great thread, lots of people need to see this.

[SPOONfdEK]

I'm a b- series motor guy, i dont know much about the K series , what is the difference between the two, and which one belongs to what car. My friend decided to pick up the new EP today so i want to be able to give him a heads up on what head to buy . thanks

[mk4gti]

Originally posted by SPOONfdEK
I'm a b- series motor guy, i dont know much about the K series , what is the difference between the two, and which one belongs to what car. My friend decided to pick up the new EP today so i want to be able to give him a heads up on what head to buy . thanks

if you look at the cams on both.. one has three lobes on both exhaust and intake... the other has one lobe one one side and two on the other

[Idriveablacksi]

wow, good post

[SPOONfdEK]

which one comes stock in the EP SI ?and which one is the type S one. Ive heard that swaping the head alone is awsesome ?

[skunk2typer]

Originally posted by SPOONfdEK
which one comes stock in the EP SI ?and which one is the type S one. Ive heard that swaping the head alone is awsesome ?

The A2= rsx. A3=Civic

[SPOONfdEK]

besides the cams , what is different about the two heads , is the RSX one ported or something. What about the CTR head ?

[Type R Special]

in both photos, the intake side is on the bottom, the exhaust on the top.

notice on the A3 head that there are only two lobes on the intake camshaft. that's for the VTEC-E version the EP gets. the smaller lobe on the left is the under-2200 rpm lobe, in which only one intake valve is opened. the middle lobe operates the valves during the rest of the time. on the exhaust, there is no VTEC mechanism.

on the A2 head, you'll notice three lobes per cylinder on each side. the outside two lobes are the low lift/duration lobes, the middle larger lobe is the high lift/duration. both the intake and exhaust valves have VTEC.

i tihnk rocker arms, valve springs are diffirent...

[SPOONfdEK]

is the ctr head any diffrent from the A2 head ?