im doin the hybrid h23 vtec. In the process of rebuilding the block. What rods should i use....h23 or h22? Im usin the h23 crank and h22 type s pistons....

 

h23 crank rods with type -s pistons also killer combo goodluck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by md23vtec &raquo;</TD></TR><TR><TD CLASS="quote">h23 crank rods with type -s pistons also killer combo goodluck</TD></TR></TABLE>

why not h22 rods? wouldn't a longer rod make for a better r/s ratio? or is it that the h22 rods would raise the compression too high for type S pistons and pump gas?

I'm going to soon be starting the assembly process of my motor and i was just wondering. I've got crower rods and wiseco pistons. I have yet to get clearances on everything because i dont have a crank yet, but i am hoping that the pistons and rods will work well together while still maintaining a streetable CR.

 

you cant use h22 rods w/ 95mm crank unless you move the wristpin height up on the piston. the piston is already gonna be out of the hole w/ 2.3 rods and i would suggest using a thicker cometic gasket for that application depending on how much the block will be resurfaced and the cam that will be used.

 

ah ok, I picked up the block spec'd to the pistons and i was told the rods are h23 length. I gotta get it outta my car so i can do some measuring and see how long the rods really are.

these are the specs on my pistons:
http://i27.photobucket.com/alb...7.jpg

I just want to keep the CR below 12:1, i dont believe that a street motor needs anymore than that.

 

I'm about to rebuild my h22a block and wanted some input.......I've heard can use a f22 crank on the h22, if so is it really worth doing it just trying to get everything out of this build as I can.

I'm for sure going with type s pistons and stock rods.....
let me know waht you guys think

 

h23 IS the 95mm crank.

h23 crank = f22 crank.

 

do you have a RMF header for my h2b built head set up?
if so, how much?

 

send me a pm with your setup

 

98vtec, are those 89 mm h22 pistons you are going to use?

if so, you will need to be careful even using them w/ the h23 rods because the edge of your cumbustion chamber will hang over the cylinder.

you could just use a thicker headgasket, but i would also remove some material from the edges of the chamber.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Missing Gears &raquo;</TD></TR><TR><TD CLASS="quote">98vtec, are those 89 mm h22 pistons you are going to use?

if so, you will need to be careful even using them w/ the h23 rods because the edge of your cumbustion chamber will hang over the cylinder.

you could just use a thicker headgasket, but i would also remove some material from the edges of the chamber. </TD></TR></TABLE>

yes, 89 mm. I've got a set of crower rods, but i dont know the lengths of them sincei havent had a chance to measure. He said they were spec'd to h23 length but i just wanna know for sure. I was thinking about selling these rods and going with pauter, tho.

About the head, i'm planning to send it off so i'm sure the guy doing it is more than capable of fixing the combustion chamber issue

 

Would removing material from the combustion chambers change compression?

 

yeah, but I'm guessing he's gonna end up with more than enough compression as it is.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Televator &raquo;</TD></TR><TR><TD CLASS="quote">Would removing material from the combustion chambers change compression?</TD></TR></TABLE>

Yes, it will lower the compresion.

Smaller comb. chamber = higher compression.

 

Something to think about for someone planing to use H22 length rods and 90mm pistons...ayayay...Sometimes, I'm amazed some of this stuff even works at all. LOL!


Modified by Televator at 2:08 PM 2/10/2007

 

well, i ran some numbers through the zeal calculator and came up with 11.45:1 compression with the 1.218 compression height, 140.38 rod lengths (center to center), 89mm bore, and 95mm stroke. R/S of 1.47 , piston to deck of .028.

regarding piston to deck, a positive number means that the floor of the piston sits .028 below 0 deck, correct?

 

which rods are you referring to Blake? with an h23 vtec your almost always gonna end up sticking out of the deck unless you use h23 pistons with the ~1.200 comp height.

 

well from what i have gathered, these rods are custom by crower.

their length from SE center to BE center is 140.38mm which = 5.527 inches

stock h23 rods are 5.572

which means my rods are .045in shorter than stock.

 

ahh well in that case then you're right it will sit below by .028"

So then you wouldn't have to worry about the cylinder head and that should also buy you plenty of piston to valve clearance as well.

 

but at the same time you're getting hosed on the R/S ratio

 

looks like i have ~.030" of "free" space

 

rosko is correct, you will end up w/ an even worse rod ratio than running a h23 rod. that wont be good for a daily driver.

if you want the motor to last and be more reliable you may want to use h22 rods w/ a custom cp piston. that is the best way to run a 95 mm stroke.

 

well, i went number crunching on the zeal calculator and entered in the h22 rod lengths and dropped the compression height from 1.218 to 1.122 and it only netted a 1.51 r/s with an effective ratio of 11.75:1

i dont understand how running .03 higher r/s would make my motor "more daily drivable"

 

it will be more reliable and allow you to rev to a reasonable rpm. the h23 has a bad ratio from the factory and is why they only rev to 6500 stock. now you will be making it worse.

you will just have to be conservative w/ rpms and it will probably need a rebuild sooner than a motor w/ a better rod ratio over time.

 

rod ratio is over hyped expecally if you run aftermarket rods