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Interesting information for A2 head swap people

1946 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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Posting once again but MANNJ, take a look at some of the dyno charts for a K24 with K20 head. The power curve is amazing and quite linear. There is no drop off in power on the dyno charts that I have seen even on a stock K24 motor and these engines (K24) are capable of revving to 8K with no problem. Slap on a JRSC onto that and your talking about in the high 280-290whp range with a linear power curve. They had a K24/K20 with JRSC in an integra and it kept up with a skyline, how's that for impressive?

im running stock ep3 pistons right now, but ill be getting golden eagle soon, only like $400 bucks. but about the k24. ive looked at dyno charts of the hasport/jackson racing rsx-s with the k24/k20a2 head and supercharger and at about 6800 rpm, the piston to wall speeds are so fast that they are moving faster than today's f1 cars. that was in super street (i believe, maybe import tuner). on the dyno chart in that mag, the power and torque dropped off, and quick. by 7100 rpm there was almost no power at all.
im sorry, that last post was for EvaUnit01
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