G23 Swap

F20, F22, F23
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By kylenjdm93
- Sun Oct 17, 2010 2:36 am #218632 I've built 2 and I'm starting my tear down this week its a monster build ill walk u thru it take step by step pics and answer any questions you have and ill re-post some specs for u guys
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By kylenjdm93
- Sun Oct 17, 2010 3:01 am #218636 k, so some faqs..

its not hard to build a g23 if you have built a b20 vtec with no leaks!

2 oil drain ports have to be plugged or welded in to mate with the f block
f23 head gasket is used
if you didnt use arp head studs your dumb
you dont have to use k20 pistons...
(if u use oe pistons from the f, waste of time low low low compression)

i am using an f22, they are cheap and i want to sleeve one in my spare time, they are 85 at local junkyards....

f22a6 is what im using, it has an 85mm bore with a 96mm stroke!, k20a's have a 86mm bore and a 86mm stroke,

im overboring my block to 86mm anyway, and im adding forged pistons and rods for my f block from airias, they only make pistons but they sell eagle rods too. :hehe:

if u use a compression calculator found by using google.com, you can figure out all the specs for everything and plug it in, im going with 11.5.1 pistons so my total compression ratio is actually 10.4:1

im opting in for a sleeve saver, i think they let u push the limits of a stock sleeve, for up to 600 whp and high boost without hurting your pocket..

i moved back home from portland, those guys are nuts, ryan at vip performance was running a sleeve saver on his sohc vtec turbo making 500whp for about 2 years, till he got greedy and blew it.. 30+ psi does that....

so, f22, arias 86mm 11.5:1 pistons made for the F! and eagle rods made for the F!, im going boost so balance in my engine is a must, plus im an engine builder so im doing it 80% right! (the other 20% is just sleeving the damn thing....)

list for my build...

f22a6 block - have
h22a head - have
b series tranny - have
hasport mounts - have
t bracket - have
k20 intake manifold
k20 to h head adapter plate (qsd)
all gaskets
acl bearings
arp head studs
arp main bolts
home made turbo kit - have
qsd h2b kit
tranny casing cover (cracked on me)

damn i cant remember anything else... lemme know if i forgot something

:thumb:
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By chrono404
- Sun Oct 17, 2010 6:23 pm #218682 K20 Heads and Intake Manifolds will NOT Work on an H/F Block.

For one K Series uses Timing Chains, H/F's use Timing Belts.

for a "G23" you need a F series bottom end, K Series pistons and H series head. Just like for a "poor mans type-r" you need a B18c(GSR) Bottom end and a b16 head. If you use a GSR head its not a poor mans type-r, if you use a ls/b20 bottom its not a poor mans type-r.

If you build a F23 block up and use non-k pistons, then slap on an H22 head you have a F23 Hybrid. Not a "G23"

They have been around a lot longer then the so Called "G22" and "g23" Names.
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By OleFolk
- Mon Jan 10, 2011 8:00 pm #232521 So bored you can produce a "G24"?
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By Eg6H2D
- Mon Jan 10, 2011 8:30 pm #232526
OleFolk wrote:So bored you can produce a "G24"?



Huh>?.. :?
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By Eg6H2D
- Mon Jan 10, 2011 8:35 pm #232528
chrono404 wrote:K20 Heads and Intake Manifolds will NOT Work on an H/F Block.

For one K Series uses Timing Chains, H/F's use Timing Belts.

for a "G23" you need a F series bottom end, K Series pistons and H series head. Just like for a "poor mans type-r" you need a B18c(GSR) Bottom end and a b16 head. If you use a GSR head its not a poor mans type-r, if you use a ls/b20 bottom its not a poor mans type-r.

If you build a F23 block up and use non-k pistons, then slap on an H22 head you have a F23 Hybrid. Not a "G23"

They have been around a lot longer then the so Called "G22" and "g23" Names.


Hmm The RBC intake manifold work on a h22/23 head now using a QSD adapter. But as tested. the Euro R manifold is slightly better utilizing more TQ in the lower end of the RPM..

:thumb:
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By OleFolk
- Thu Jan 20, 2011 3:58 pm #234427 I have two questions about this G23

If the F23 block is decently similar to K's, would you be able to use a K20 trans?

Also wouldn't it be more realistic to use the jdm H23a head?
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By OleFolk
- Thu Jan 20, 2011 4:10 pm #234431 Kinda looked it up because I was wondering
Why not even use the F20B Dohc Vtec head?
It seems to be H22a>H23a>F20b
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By OleFolk
- Tue Apr 12, 2011 9:18 pm #250038 Why couldnt you use a k series 6-speed on an f23 block
Why dont people use H23 heads instead of the H22 head
Why doesnt someone slap that F23 block in an S2k or F20C trans
And Why dont they use K23A1 pistons.....

Im sorry for flooding
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By chrono404
- Wed Apr 13, 2011 1:23 am #250078
OleFolk wrote:Why couldnt you use a k series 6-speed on an f23 block
Why dont people use H23 heads instead of the H22 head
Why doesnt someone slap that F23 block in an S2k or F20C trans
And Why dont they use K23A1 pistons.....

Im sorry for flooding

- The F23 Will accept K20 Pistons, to my knowledge its the only F/H Block that will do it on stock clyinder walls. However the block is nothing like a K Series.

- The H23 head is non-vtec. The H23 Blue top DOHC VTEC head is basically a JDM H22 head and is quite rare.

- The only simularaity in the F22/F23 block(accord base) to the F22C(S2k) is the Naming scheme. The F20C(s2k) and F22C(s2k) are built more like a K Series then the F/H Series. I.E. Timing chains vs timing belts, different bore/stroke sizes.

- there are no current existing adapter plates to put an accord h/f into a s2000. The blocks are totally different and will not bolt up to the s2000 transmission. EVEN if there was a kit to do so it would not be a legal swap in the United States as you cant put an older engine into a newer car.

OleFolk wrote:I have two questions about this G23

If the F23 block is decently similar to K's, would you be able to use a K20 trans?

Also wouldn't it be more realistic to use the jdm H23a head?


- All F/H's Including the F20c(s2k) and F22c(s2k) spin the opposite direction of a K20/K24. So no you can't use a K Series tranny on one.

- As mentioned above the JDM H23a dohc vtec is a rare head and has stock h22a cams in it. If you look on honda-tech there is a thread discousing all about the h23 blue top. They thought it had type-s or euro-r cams however it turned out to be stock h22a cams. You might as well just get a H22a Dohc vtec head and save some money. The F20B Head is also a H22a Dohc VTEC head as well. Most people refer to it as a H22a head despite which engine it came from as they are all the same head.
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By OleFolk
- Sat Apr 16, 2011 4:10 am #250680 Thats amazing
Thank you chrono I appreciate it
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