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Interesting information for A2 head swap people

1944 Views 18 Replies 9 Participants Last post by  tinkerbell
First off this is my first post here and wanted to say hi. I have been doing research on both NA setups and FI setups for my K20A3 for some time now (MI4K20, you know I can't make up my mind sometimes.) and while I was leaning more and more toward turbo I found out that NA with the A3 block is actually very promising. I have a complete ported and polished Type S head, Type R intake manifold, Type S throttle body, Type R pistons and Rods, Type S ECU. I talked to Doug from Hondata today and he had this to say:

The A3 rods are weaker then the A2 - and it is revs that normally kill them. If you want to stay NA, compression is low with the A3 pistons and I would recommend aftermarket high compression pistons - such as 12:1 and rods. Combined with the Type S head and type R intake + some race headers it should fly. At high rpm, 9000 + and in racing conditions the stock pistons fail.

So it is true that the crank can handle higher revs (although i'm not going up to 9k, just staying stock A2 rev limit) I think the Type R pistons would be best, they are forged and can handle more heat and stress than the A3 pistons so NA is looking very good now.
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Welcome to the site.

From what I understand, you have a complete type S head (polished) but are not sure if you should put it on the A3 or the k24a.

If you buy type r pistons + rods, you are looking at how much $$ compared to the k24a complete longlblock?

Also the k20a3 has no oil squirters and smaller water passages. For forged pistons you don;t need them, but why does the k20a R has them?

Also are you going to pay someone to do the labor?

Finally it seems to me that the k20a3/k20a2 head initially "might have more" power and the k24a/k20a3 wil have it from the start till 6800 with stock internals.

I have read many people comments about revving high and all that, but it seems to me that the potential for growth is better with the k24a with type S. What better example than the 300whp HASPORT integra k24a/k20a2 with Jackson supercharger. That car almost matched the skyline by like 4 seconds. If you want to stay N/A, you are going to have to spent major money to get to 300whp... I am sure you know that... But at least it is possible.. with the k20a3, I don;t see it.

really depends on your goals, funds and dreams :p

Here's is something you need to read , taken from honda tech

this dude posted this entitled "Driving impressions! k24 powered EP3. (Electron Blue Blur)"

Welp,as some of you know,i kinda had a lil "problem :p " with my a3,and recently replaced it with a k24 out of a CRV,and added a K Pro to tune it.....Well,i havent even tuned the thing yet,and let me tell you...This thing makes GOBS of tq,down low,and through the midrange.....I havent EVER enjoyed my car this much before,and i havent even thought about pushing it yet,since its untuned.....The swap was very straight forward,and i only had to use a CRV upper pass side mount to get it to fit properly.I used the k20s IM/Ex Mani,tranny,clutch and flywheel,so it ended up being VERY cost effective.There were no mods required to the harness either,it is a plug and play swap........I highly recommend this motor to anyone that wants to swap,and cant afford the cost of a k20a or a2.It should be very easy to hit 170whp/160ish tq with bolt ons and the K pro.Shoot,thats like an a2 with an intake,but a LOT more tq,for half the price.........anyhow,this swap gets the :thumbup: from me,and it would be a great starting point for someone ready to ditch the a3 and not go broke in the process.. =)
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EvaUnit01 said:
Thanks for the welcome nikos, I can get Type R oversized pistons for 360 shipped and forged rods for 400. No labor pay involved, my father in law got a deal going on, one of his friends owes him a favor and will do the install for free. I wasn't really planning on going to 300whp, 210-220whp is fine with me. I'm also looking into getting a k24 (CRV) engine as well and do the head swap.
And you have a RSX base or a Civic EP3?
I don't think the K20A Integra Type R pistons are forged. The pistons have a chromoly skirt but are not forged. Therefor you would need oil squirters unless you take the "I don't really care" LS/VTEC" approach :p (if you are using the k20a3 block)
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