mgags7

Ok, since the f23 hybrid engines seem to work best with pistons such as the k20, RDX, or f20c, and there is little to no find-able info on these pistons I made a thread.

Lets see if we can get the full rundown on these pistons, with compression height and dome cc, as well as making sure the wrist pins all will fit the f23 rods.

I'm under the impression that the f20c pistons will work in the FRM but the k20 and RDX would req an iron block such as the f23.

Also, anyone know anything about possibly getting some stronger rod bolts for the f23 rods?

If I can do this fairly simply I'll be putting together a 97mm bottom end with my h22 head and crower3 cams soon. I'd like about 11.5:1 static CR, though 12:1 wouldn't kill me

skunked

do it do it

alterdcreations

x2
or over bore to 87mm and use s2000 pistons

prelittlelude

i don't know dome volumes, but k20/k24/f20c/f23 have a 1.181 compression height, I would assume the RDX motor does as well.

f20c/f22c = 87mm
k24 = 87mm
k20 = 86mm
f23 = 86mm

edit: Pirate will be in shortly , his head is like a sponge, it has been a while since i needed to remember this info.

as far as the wrist pin diamter differences they are all very very small, just the difference between a press fit or floating wrist pin. Either way the pin floats in the piston its just a matter of whether its pressed into the rod.


Modified by prelittlelude at 3:13 PM 4/2/2007

mgags7

werd

lol yeah pirate's brain qualifies as an encyclopedia, either that or he has a list of bookmarks 10 pages long....

Rick had posted a 1.171 compression height in that thread in the allmotor forum, these things are gonna make more compression than I thought....mmmm

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">werd

lol yeah pirate's brain qualifies as an encyclopedia, either that or he has a list of bookmarks 10 pages long....

Rick had posted a 1.171 compression height in that thread in the allmotor forum, these things are gonna make more compression than I thought....mmmm</TD></TR></TABLE>

yeah that was a typo, and then I followed up his post and was so tired i just retyped what he said.

everything i have in my notes and what i can find online says 1.181, 30mm

mgags7

Just found a set of f20c pistons for sale, and a guy on h-t has an f23 crank and rods....anyone know about aftermarket rod bolts maybe???

Anyone have a spare 55mm main h22 block laying around??

alterdcreations

Thats what im looking for

98vtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alterdcreations &raquo;</TD></TR><TR><TD CLASS="quote">Thats what im looking for </TD></TR></TABLE>

did you say there was a company that made aftermarket bolt for the f23 rods?

You know, if the diameter of the bolt hole on the rod is the problem, why couldn't you precision machine it larger and run a h22, b18c....rod bolts?

mgags7

me first....

lol

98vtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">

Also, anyone know anything about possibly getting some stronger rod bolts for the f23 rods?

If I can do this fairly simply I'll be putting together a 97mm bottom end with my h22 head and crower3 cams soon. I'd like about 11.5:1 static CR, though 12:1 wouldn't kill me </TD></TR></TABLE>

11.5:1 static is gonna put you even lower when you add the duration of those cams you have, lol.

mgags7

ok then....I'll go with 12.5:1

98vtec

well, as long as they can bleed enough compression for you to run pump gas safely, without having to back down too much timing to where you are losing power by running too much compression on pump gas......then be my guest

mgags7

I daresay the dynamic compression right now is dangerously low......

either way as I see it now, the setup will be f23 crank and rods with f20c pistons.

.BigSexy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">I daresay the dynamic compression right now is dangerously low......

either way as I see it now, the setup will be f23 crank and rods with f20c pistons.</TD></TR></TABLE>

are the f20c pistons forged straight from honda? and we are talking about the f20c out of the pre-2004(or so) s2000 right?

mgags7

yeah, the first gen f20c

The pistons are supposedly forged from honda, and made for FRM liners....

A Blue Lude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">I daresay the dynamic compression right now is dangerously low......

either way as I see it now, the setup will be f23 crank and rods with f20c pistons.</TD></TR></TABLE>

Ha, mine is probably even lower. At least you have a JDM block.

So has anyone figured out what the F20C piston would leave the CR at?

My block even has 55mm mains, although taking apart the current engine probably wouldn't be a great idea. It would be nice to do though

edit: though skunked wins the "low dynamic CR" award, his engine's magic powers make up for it somehow.

98vtec

he has fairies in his injectors that throw nitrous into the mix.

CHEATER!!!!

.BigSexy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">yeah, the first gen f20c

The pistons are supposedly forged from honda, and made for FRM liners....</TD></TR></TABLE>

hmm....very interesting. do these adopt a floating wrist pin? much like the type s? or h22a4?

i wonder if the compression on these would be higher than that of a type s? wonder if they would fit an h22 rod? lol

.BigSexy

anyone have the equation for static CR? or do yall just use one of those online calculators?

mgags7

I'm trying to find a pic of some f20c pistons....but at a zero cc dome the zeal calculator says 11:1 compression

With 2cc its like 11.4

Thats not enough
lol

Rosko

iTrader: (1)

Crower rod specs for a bunch of Hondas...
http://www.crower.com/cat/impo...shtml

Arias pistons... they list head cc's and comp heights of everything, but no s2000 pistons
http://www.ariaspistons.com/pr....html

bluedlude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by egcoupe94 &raquo;</TD></TR><TR><TD CLASS="quote">anyone have the equation for static CR? or do yall just use one of those online calculators?</TD></TR></TABLE>

i remember doing CR calculations with you before when you were thinking of using F22 rods and pistons. dont tell me you forgot

LudeBehavi0r

According to pirate in his frankenhonda thread the K20/K24 pistons have the same compression height as the f23 and a 22mm floating pin. I havent found the formulas for compression yet. I know they're somewhere in his thread or in something Rick Solis was cooking up b4, its just going to take a min to find em.

.BigSexy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bluedlude &raquo;</TD></TR><TR><TD CLASS="quote">

i remember doing CR calculations with you before when you were thinking of using F22 rods and pistons. dont tell me you forgot </TD></TR></TABLE>

I remember that...

Ill go back and go to those threads.