GRAF-FITI

i think you are lost and are using the "stupid ricer" copout

LostMotion

The F series has a couple of advantages, including forged internals from the factory. This means you don't have to tear your whole motor apart to do a moderate NA build because the stock internals can take it. The other big advantage is that the stock F head does flow better, not by a lot, but it's noticeable. Probably in the 10% range. The F22 of course has a little extra displacement as well.

The K's big advantage is VTC or Variable Cam Timing. It's really helps for drag type runs where you use the entire power band. For track racing where you stay in a narrow powerband it's not as useful and it does increase valvetrain weight.

g352s2k

The F20 had the King's Noble Men put it together. The k20 had peasents from a village put it together.

skeithr

i mean we are talking about the most powerful production N/A engine on earth. or am i on another planet. i mean 240 for a 2.0 inline 4 come on. who else does it better than those that designed the f20 or the f22 for that matter

FoBangah

Sorry to jump in being a nOOb and all but The F20/22 are not COMPLETELY different. I'm not gonna bore you with ALL the details but the more recent SPOON civic type R has a k20/F20 hybrid. K20 head on a f20 block. (Check video)Not to mention theres a write-up on how to use the K24s' crank and rods to make a cheap stroker kit for the F20/22 ( ?F24 ? ) I'll try to find that article and post a link .

For the record, the F20 will bolt to a K series tranny and A COMPLETE F20/k TRANNY HAS BEEN INSTALLED IN AN eg CIVIC HATCHBACK. All you inlinepro loving guys should know that!

F20/K20 hybrid

FoBangah

I wish this were true but no. I can't remember which factory engine it is that has the highest power-to-liter/displacement, but the S2000 does have a more efficent engine than the F430. S2k=122.5 hp/liter, F430=114.43 hp/liter. Atleast in base trim. Eat that ferrari!!!

skeithr

eat that ferrari indeed, please let me know who does, because every review in the industry has pointed to the s2000 f20 and f22 as far as i know. i might be biased though i love my ap1

jzz30

and since this turned out to be a F v.s. K thread why did spoon use the K head? simply because of the i-vtec. and they used the F bottom because it is more ridgid than the K so it can safely rev higher than a k bottom.

Slows2k

K and F cylinder head and transmissions do not interchange. The cam drive is completely different, and so is the bolt pattern for the trans.

It's not GT4, you don't just pics parts you like and they all bolt together.

chris_barry

I've tuned, built and raced both F20's and K20's including K24A frankenstiens and other variations. ( in Lotus 7 style chassis, and Lotus Elises)

I view the F20C as the engine Honda built as a new generation engine as a treat for the S2000. The K20A was then built using a surprising amount of the F20C geometry and technology but also made modular so the design could be varied for low power efficient motors, very clean emissions, and also high performance derivatives. The K2x family is used in a vast number of Honda models each tuned for particular requirements. The addition of the Variable camshaft timing allowed tuning of both the torque characteristics and emissions. Part of the modularity was also the 2.0 and 2.4 litre options.

I suppose I'm saying, the F20C was the start of a new generation of Honda motors, and the K20x, K24X is its high volume production offspring.

Chris.