ok im gonna put together a g23 with a f23 block and my h22a head its going to be an all motor weekend car for dragracing. so what i wanna know is what rod and piston setup can i run SAFELY and rev up over 8grand with out any issues. Any info would be apprecaited
THANKS JAY

 

ohh its also a h2b or g2b whatever u wanna call it lol

 

Crower F23 rods are about the only thing you need to safely rev to 8000. Just use a 1.181" compression height piston to keep the pistons below the deck. Forged pistons will be better than OEM cast options.

Pirate

 

What about the crank? Can the F22 crank safely rev that high? I have a friend who is considering this build as well.

 

so I will need to get custom pistons and crower rods ok I didn't know they made f23 rods but thanks for the info

 

I've been looking at this too but with the f22a head. Crower makes a Max-lite rod that would work really well. This is what I may end up going with.

 

https://honda-tech.com/zerothread?id=1046336

 

yeah I seen those threads but that is with a non vtec head and the other is turbo so I want to know more about the allmotor setup info thanks

 

you can use stock rsx pistons.

I was building a g. I was using an f23 bottom end with RSX-R pistons (cheap) with an h22 head.

Because I wasn't changing the rods my high rpm would have suffered but it was going to be a budget build.

 

so if some one can tell me the reason this can't rev to high is it cuz of piston to valve clearance

 

BUMP FOR INFO

 

I believe at that rpm and that Piston speed that it puts a lot of stress on a part that is not supposed to have on it.

If you look at the f23 rods you can clearly see the difference in the h22 rods.

This is just my information I am sure there is more.

 

Here are some numbers of the rods. You can clearly see why the f23s are not made for high stregnth

Rods

Length
H22A4 = 5.633
H22A = 5.633
H23A = 5.572
H23A1 = 5.572
F22 = 5.572
F23 = 5.551
F20B = 5.709

Width
H22A4 = .935
H22A = .935
H23A = .935
H23A1 = .935
F22 = .935
F23 = .780
F20B = .935

BE Bore
H22A4 = 2.008
H22A = 2.008
H23A = 2.008
H23A1 = 2.008
F22 = 2.008
F23 = 1.890
F20B = 1.890

Crower makes billet rods for the f23.

The k20a3 has the same width rods so I though I would compare piston speeds if we are going to use the k20 pistons

The rpm cutoff of the k20a3 is 7100. which makes a piston speed of 20.35 m/s
The rpm cutoff of the f23a5 is 6800 which makes a piston speed of 21.99 m/s
already the f23 has a higher piston speed.
for the f23 and 8000 rpm the piston speed would be 25.86 m/s.

I am not sure if this has relevance but it somewhat scares me if people are going to rev this **** out of the bottom end of an f23.


Just so you guys know this is one of the best pages for mix and match parts for H/F

https://honda-tech.com/zerothread?id=1232811



Modified by kulrevon at 1:37 PM 2/14/2008

 

thanks for all the info

 

So I would say go with an f23 crower billet rod. rsx-r pistons and you should be good.

 

is the rsr-r piston the right height to stay in the block? and what would my cp be around cause I also am gonna run a some cams but don't know yet how big or which. Thanks
bump it up

Jay

 

I can tell you that the published F/H block height (AKA the distance between head gasket mating surface to crankshaft center line) is 8.643". I am sure that it is a little different for each block but it's all pretty close.

1.909" one half F23 stroke
5.551" F23 rod length
1.181 RSX piston compression height.
= 8.641" total length of rotating/reciprocating assembly from the crank centerline to the piston's quench pad (not the crown).

So that combination will fit inside the standard height cylinder block.

And Its been awhile so I can't remember what the compression ratio will be. I remember it being somewhat high maybe 11.8-12.1 . Dont quote me someone find out the cc of the rsx-r (DC5-r) piston dome and do some calculations.

If you get a 300 gram piston/pin/ring combo then you can rev to 7500 all day long and experience less forces than the Stock piston/pin/ring combo at OEM redline of 6200rpm. Which means that the OEM rod and bolts will be fine holding the mess together at 7500rpms for a LONG time.

Heres the link for the dc5-r's
http://inlinefour.com/jdmhonoempis.html

 

Yes the rsx pistons will be the correct compression height for the F23. But longevity at high torque and revs might be limited to the oem RSX piston pin offset:

https://honda-tech.com/zerothre...83322

Otherwise if you get a 300 gram custom piston with no/the proper offset then rev to 7500 all day long if you like.

Pirate