What do i need to do to a H23 bottom end, to be able to make it rev to 8,200rpms safely?
I am using a H22 head, with Crower Valvetrain.

 

balance the crank and hope to god it lasts. which BTW, it wont.

 

Does your car make power that high in the RPM band??

 

The Crower Stage 2 cams and valve train do make power to 8k, but on a H23 VTEC? Not sure, good luck, let us know.

 

Does not sound to good. I guess i might sell the bottom end and buy a h22.

The h23 bottom end has oversized Type S pistons in it, and the crank is knife edged, and balanced. And the rods have ARP Rod Bolts.

But if that wont be able to rev to 8,000 safely, i will just sell and build a h22 to rev to 8,000

 

So what does a H23 rev to safely anyways. I never really looked much into them. I just know that i want alot of displacement

 

If you had the H23 crank balanced properly, I don't see a reason why it shouldn't withstand the higher revs capable of the H22 crank. It should be as reliable too.

If I am wrong, please let me know.

 

Just get an h22 bottom end. i take mine to 8300 on the tach with my jun head. with built bottom end, dont see why you couldent go higher. Make sure you get cams that make power that high.

 

I am new to the H's. Been messign with the high reving B's for a while, so its a kinda hard change. Espically since i am jumping to a H23. I dont even know what a stock h23 revs to

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98TypeSH &raquo;</TD></TR><TR><TD CLASS="quote">Just get an h22 bottom end. i take mine to 8300 on the tach with my jun head. with built bottom end, dont see why you couldent go higher. Make sure you get cams that make power that high.</TD></TR></TABLE>

Do you think that the h22 bottom end will yield more hp than the h23. The reason i ended up getting the h23 is because i been hearing that h23 vtec makes alot of power. But now that i been researching, i havent been seeing anything positive about the h23 vtec.

 

The reason why you don't hear anything positive about the H23 VTEC is because most people don't prep the crank (balance it) before revving the shyt out of it.

Just like turboing Honda motors, they have to be prepped if you want to maintain reliability (don't get me started on putting FI on Honda motors either. ) Same thing holds true for the H23 VTEC hybrid.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AndyD &raquo;</TD></TR><TR><TD CLASS="quote">If you had the H23 crank balanced properly, I don't see a reason why it shouldn't withstand the higher revs capable of the H22 crank. It should be as reliable too.

If I am wrong, please let me know.</TD></TR></TABLE>

I believe it is because of the longer stroke of the h23.
Higher speeds put more stress on the internals of the h23
vs an h22.

You can balance the bottom end of the h23 and you should anyways
if you're rebuilding it. But it's still not gonna be able to handle the speeds
that a well balanced h22 can.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Power Rev Racing &raquo;</TD></TR><TR><TD CLASS="quote">
I am new to the H's. Been messign with the high reving B's for a while, so its a kinda hard change. Espically since i am jumping to a H23. I dont even know what a stock h23 revs to</TD></TR></TABLE>

Being a b-series guy, i can see why you want to take the h23 to those speeds
but its not gonna make more power that way, it will just rapidly decrease the
life of your motor.

The point of the h23 vtec, is to have more low end torque along with
the high end power in the h22 head.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Power Rev Racing &raquo;</TD></TR><TR><TD CLASS="quote">
I dont even know what a stock h23 revs to</TD></TR></TABLE>

safely, 66-6700 anything higher than that, you're entering spun bearing city.

read up on the h23vtec thread in the sticky's before you make anymore
decesions on what you're going to do

 

Thanks for all the good Replys

 

That, and the fact that the h23 wasnt designed for the high stress, temperatures, and speed of vtec.

Just go for the h22 entire motor. If you are going boost, get a bare block for cheap, resleeve, and get your low comp pistons and so on.

If you are going N/A, look for a JDM block as it has a little bit higher compression. Usally with big lift/duration cams, the higher the compression the better. Just be sure your setup is able to run on whatever kind of gas you have available at the pump.

 

I don't recommend spinning the H23 crank past about 8k; I believe there may be a harmonic frequency that is being hit around that RPM.

Now if you wanted to spin it up to 8k, or anywhere higher than 6.5k, then I would have the bottom end dynamically balanced, have the crank's journals micropolished, and use some good bearings.

As has been said above, the H23 VTEC is going to suffer from higher piston speeds at the same RPM as an H22, so the overall capability of the motor to rev will be lower than an H22.

Also, the H23 VTEC is NOT designed to make power through revving. There are only two ways of increasing horsepower: through either increasing the revlimit of the motor, or through increasing the torque. The H23 VTEC uses a bigger crank to make more torque, not to rev higher.

 

I doubt crower cams an d an H23 crank will make power up there....when I had mine it was peaking at 7000

 

wouldnt an h22 crank with h23 rods have almost the same stroke as h23 crank and rods? why not just get a h22 block and throw the h23 rods?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hOndafienD 04 &raquo;</TD></TR><TR><TD CLASS="quote">wouldnt an h22 crank with h23 rods have almost the same stroke as h23 crank and rods? why not just get a h22 block and throw the h23 rods?</TD></TR></TABLE>

The H23 rods are shorter than the H22. H23 stroke&gt; H22 stroke = H23 shorter rods&lt; H22 rods... thus the lower R/S ratio

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hOndafienD 04 &raquo;</TD></TR><TR><TD CLASS="quote">wouldnt an h22 crank with h23 rods have almost the same stroke as h23 crank and rods? why not just get a h22 block and throw the h23 rods?</TD></TR></TABLE>

wouldn't matter anyway, you can't use h23 rods on an h22 crank.

here's some info
ENGINE HP SIZE DECK BORE STRK ROD C-H PIN H-D BEW BEB
H22A1 190 2200 8.655 3.425 3.571 5.630 1.222 22 53.8 .935 51
H23A1 160 2300 8.655 3.425 3.740 5.571 1.203 22 50 .935 51

 

[QUOTe

The h23 bottom end has oversized Type S pistons in it, and the crank is knife edged, and balanced. And the rods have ARP Rod Bolts.
[/QUOTE]

With th0se pist0ns (pretty high c.r. with the r0ds and the str0ke) and tuned weLL 0fc0urse this thing sh0uid make nice p0wer ; yea d0 a search and read aLL y0u can find 0n h23 vtec.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spirit7627 &raquo;</TD></TR><TR><TD CLASS="quote">

With th0se pist0ns (pretty high c.r. with the r0ds and the str0ke) and tuned weLL 0fc0urse this thing sh0uid make nice p0wer ; yea d0 a search and read aLL y0u can find 0n h23 vtec.</TD></TR></TABLE>

Dude.........shut the **** up.

 

what!!?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spirit7627 &raquo;</TD></TR><TR><TD CLASS="quote">what!!?</TD></TR></TABLE>

St0p T4lk1Ng l1k3 4 F4g, y0!

 

WHAT ! A -H0iE my keyb0ard driver is acting up. F0r y0ur inf0 I d0 n0t say y0 at the end 0f a sentence... Did n0t kn0w **** taik ab0ut C.R. and R.S. rati0...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hOndafienD 04 &raquo;</TD></TR><TR><TD CLASS="quote">wouldnt an h22 crank with h23 rods have almost the same stroke as h23 crank and rods? why not just get a h22 block and throw the h23 rods?</TD></TR></TABLE>

changing the length of the rod has nothing to do with changing the stroke. the stroke is determined purely by the crank. Using a longer or shorter rod will change the position of hte piston in the cylinder, but it still moves up and down the same distance (stroke)

an H22 crank with 4 foot long rods would still have the same stroke as a stock H22. an H23 with 2 inch rods would have the same stroke as a stock H23.