when running an h23 with a h22 crank what amount of piston dish will yeild a boost friendly compression ratio

 

Well, assuming you will be using h22 rods with that h22 crank inside an h23, then you basically have an h22... Just buy h22 pistons in whatever c/r you want... Or use h23 pistons... That would give you a boost friendly c/r...

 

is this an h23 block with h22 internals and h23 head or h22 head?

h23 head is 50cc
h22 head is 53.8cc

it will change your compression

also if the motor is not sleeved you are limited to h22 pistons or h23 pistons,

 

Ok sorry let me give you a full setup so you can better answer my question. I will be running a sleeved h23 block with an h23 head. I planned on buying h22 crank to save myself some money on the 700 dollars crower rods that would be required for an regular h23 build up . A local builder i know has an upstairs full of **** he let me go through and find anything i could use . Finding je pistons and eagle rods for and h22 that he will give to me for a very low sum of money I figured the amount of money saved using an h22 crank would be well worth it. My only question is which pistons can be used. The je 9 to 1's for the h22 (these are the pistons i can get for 100 dollars) have a 7.1 dish and i dont think it will be the right compression for a turbo setup in an h23 with a h22 crank. Does anyone know which pistons i could use?

thanks Joe

 

Well in that case your pistons will be slightly higher than 9:1... Because you are basically using an h22 with an h23 head... Every factor is the same excpet the head volume... Smaller combustion chamber=higher compression... probably somehwere around 9.5:1...

 

any ideas on running 9 to 1 h23 pistons? i think it would be closer to nine the running h22 pistons

 

anyone out there have a clue?

 

87mm bore
90.7mm stroke
50 cc head
-7.1 piston volume
.026" headgasket
.005 piston to deck clearance (assuming 1.223" compression height)

is 9.7:1CR

it isn't that great for boost or all motor.

Pirate

 

i thought the dish was 11.9 for h23 forged pistons with 9 to 1 compression?

 

ok after some searching online i found the formuals for finding compression ratio. using 9 to 1 h23 pistons should give me 9.1 cr. thats the best i can get i think thanks for all the help guys

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by my9thtry &raquo;</TD></TR><TR><TD CLASS="quote">ok after some searching online i found the formuals for finding compression ratio. using 9 to 1 h23 pistons should give me 9.1 cr. thats the best i can get i think thanks for all the help guys </TD></TR></TABLE>

you have to be aware that the h23 and h22 pistons have idfferent compression heights. and because your using and h22 crank and rods you need to match that up with h22 pistons. you need to calculate based on what the volume of the piston dome/dish is also acount for the 4.3mm less storke and smaller head CC of the h23 head.

 

I am aware, i just thought using the h23 pistons would offer me the compression ratio i need. I was assuming that h23 pistons would have a compression height of 1.204 so the piston would be farther below the deck, thus resulting in lower compression. Is that incorrect ? I am by no means an engineer so if you see any mistkaes i could have made let me know
thanks joe

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PirateMcFred &raquo;</TD></TR><TR><TD CLASS="quote">9.7:1CR

it isn't that great for boost or all motor.

Pirate</TD></TR></TABLE>

Thats actually a damn good CR for a steet driven boosted motor. I like 9.8:1 - 10.4:1 for a street turbo motor (under 24 PSI), Even higher (11:1 - 11.5:1) for a drag motor. The motor is very responsive with higher compression and will make more power per lb of boost. You just have to make sure your gas and tune are up to par

Youd be suprised what youll find when you start playing around with compression and boost...

Heres a good example:

https://honda-tech.com/zerothread?id=1221962

Stock head, stock intake manifold, stock cams, built block (87x90.7), 10:1 compression, 26PSI

Can you say yummi?


Modified by Innovation at 7:51 PM 4/23/2005

 

i think if i could id rather go lower i dont know of that workin for many others

 

Its all in tuning, its not a matter of it working... Its simple, compression makes power...

The only reason people go with low compression is because some have the idea that it will be less prone to detonation and allow you to run more boost.

Well, with higher compression you dont need as much boost to make the same power and with good gas and proper tuning you wont have any worries of detonation in the first place.

It will be a lot more responsive too

Most of the pro cars out there are running 10.5:1-12:1+ compression, thats something for you to think about

 

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

Most of the pro cars out there are running 10.5:1-12:1+ compression, thats something for you to think about </TD></TR></TABLE>

Thats probably true...but the race cars are running on race gas all the time to support that much compression. ON a street car the most I see as feasible is 10.5:1..with the h22 I wouldn't go above 10:1, it's just too dangerous.

 

Stock H series VTEC motors have anywhere from 10:1 - 11:1 compression and people have boosted them just fine.

Look at Type R motors (B series), look at the power those things put out with even the smallest amount of boost.

Im telling you, all it takes is good tuning and 91-94 octane

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Innovation &raquo;</TD></TR><TR><TD CLASS="quote">Stock H series VTEC motors have anywhere from 10:1 - 11:1 compression and people have boosted them just fine.

Look at Type R motors (B series), look at the power those things put out with even the smallest amount of boost.

Im telling you, all it takes is good tuning and 91-94 octane</TD></TR></TABLE>

You are forgetting none of the stock cars can take much boost or HP...the most I've seen people running w/ turbo on stock VTEC h22 is 10 psi and around 300whp, and usually thats on race because at pump its detonating/pinging a lot with that, either that or you need a nice big headgasket. I'm not saying it can't be done, I'm talking about safety and reliability here.

 

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

You are forgetting none of the stock cars can take much boost or HP...the most I've seen people running w/ turbo on stock VTEC h22 is 10 psi and around 300whp, and usually thats on race because at pump its detonating/pinging a lot with that, either that or you need a nice big headgasket. I'm not saying it can't be done, I'm talking about safety and reliability here.</TD></TR></TABLE>

If your pinging and detonating with 10 PSI and 10:1 compression you have some serious tuning issues.

It can be done, safely and reliably... Tuning, tuning, tuning

 

9.7:1 C/R
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Innovation &raquo;</TD></TR><TR><TD CLASS="quote">
Thats actually a damn good CR for a steet driven boosted motor.</TD></TR></TABLE>

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

If your pinging and detonating with 10 PSI and 10:1 compression you have some serious tuning issues.

It can be done, safely and reliably... Tuning, tuning, tuning</TD></TR></TABLE>

I concur with both statements...

 

i agree with the statements of a 10:1 for boost is a great street boost car, especially with forged pistons. But if you put h23 pistons on h22 rods/crank remember h23/f22 pistons have a higher wrist pin location then h22, so that piston will sit down in the hole.
and for the comment of 300whp is all stock can take there were/are two threads in FI that have stock H motors with 400+whp.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by accord387 &raquo;</TD></TR><TR><TD CLASS="quote">
and for the comment of 300whp is all stock can take there were/are two threads in FI that have stock H motors with 400+whp.</TD></TR></TABLE>

An H motor can make 400whp on a stock block, but it takes a lot of money to make a setup that is efficent enough... And good tuning is a must...

 

H ringlands dont like big boost... At the boost levels needed to achieve 400 hp your pretty much living on borrowed time

 

I didnt' say how long it was last, just that it can be done. 400whp doesnt' require a crazy expensive set-up imo either. if the block can take it you can put together a relatively cheap and efficient kit.

 

lol... The word cheap makes me cringe