Deck clearance for H22-

Block height(8.643)- stroke(3.570/2)- Compression height(1.221)-rod center to center(5.633)=0.004

IF I did the math correctly.

Now to do the math to get the new Compression height for the new stroke-

block height(8.643)-stroke(3.818/2)-rod center to center(5.633)- desired deck claerance(0.004)= 1.097 new compression height of new piston.

Thanks.

 

wow, so you are trying to use H22 rods with a 97 mm stroke or at least some type of rod that is the same length of the H22? I hope you are not trying to use a shelf H22 rod with an F23 crankshaft because the rod journals on the F23 are not compatible with a regular H22 rod. But yea the math looks right but that compression height is getting pretty low.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote">wow, so you are trying to use H22 rods with a 97 mm stroke or at least some type of rod that is the same length of the H22? I hope you are not trying to use a shelf H22 rod with an F23 crankshaft because the rod journals on the F23 are not compatible with a regular H22 rod. But yea the math looks right but that compression height is getting pretty low.</TD></TR></TABLE>


Yeah I know, also have the mains to deal with as well. I am gonna call CP about the pistons and see what they say. If I have to run a deck plate, so be it. Fitting the rods to the crank, havnt figured that one out yet.

Damn, been focussing so much in the pistons that I did not even notice about the rod. Getting the rod to the correct width could be done with machining(not sure how this would effect strength of rod though), thicker bearing maybe to close the gap between rod and crank?

Damn, damn, damn.


Thanks for the input and good eye.

 

no, not only would the journal be too small for the H22 rod, but would also be narrow, the F23 is alot different. So if you were really wanting this to work you would have to get a custom low compression height, and a H22 rod that was narrower and had a smaller journal. I would probably just use the H23/F22 crank with H22 rods and custom pistons and call it a day because its been done before and it would be alot less hassle

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote">no, not only would the journal be too small for the H22 rod, but would also be narrow, the F23 is alot different. So if you were really wanting this to work you would have to get a custom low compression height, and a H22 rod that was narrower and had a smaller journal. I would probably just use the H23/F22 crank with H22 rods and custom pistons and call it a day because its been done before and it would be alot less hassle</TD></TR></TABLE>

Yeah, the H23/F22 crankshaft was my backup plan. Will still yeild a 2.4L displacement, just not as nice as if the F23 crankshaft would produce.

Gotta go crunch some numbers.


Thanks for the input.

 

I said custom rod, not h22 rod.

EDIT: I told you at the beginning that the width was only .780 by comparison to the .935 for all other h/f series. That's why you need a quality rod.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Adam. &raquo;</TD></TR><TR><TD CLASS="quote">I said custom rod, not h22 rod.

EDIT: I told you at the beginning that the width was only .780 by comparison to the .935 for all other h/f series. That's why you need a quality rod.</TD></TR></TABLE>


I swear you said to use an H22 rod. Dont make me go look for it.

Oh well, the most cost effective way for me is the H23/F22 route anyways.


EDIT: You were right, you told me to run the calculations to figure out what rod I would need. My bad, must have picked it up somewhere else.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC4_MADMAN &raquo;</TD></TR><TR><TD CLASS="quote">


I swear you said to use an H22 rod. Dont make me go look for it.

Oh well, the most cost effective way for me is the H23/F22 route anyways.


EDIT: You were right, you told me to run the calculations to figure out what rod I would need. My bad, must have picked it up somewhere else.


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

No worries. You'll definitely want custom and high quality as a rod at .780 will be thinner than .935 and thus not quite as strong.

Now-- I remember when I did the research, I was told you can simply modify the crank to have it accept .935, which would be the most beneficial of all. What you need to figure out is the best rod length you want and then the compression height of the piston to match your 11.5:1 ratio. It's a little bit confusing at first, but you'll need another calculation to figure out what compression height will give you the right CR for 11.5:1 and then what size rod that compliments that.

It's really just adding and subracting for rod length and compression height. THere some multiplying the CR equation though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Adam. &raquo;</TD></TR><TR><TD CLASS="quote">
you'll need another calculation to figure out what compression height will give you the right CR for 11.5:1 and then what size rod that compliments that.

It's really just adding and subracting for rod length and compression height. THere some multiplying the CR equation though.</TD></TR></TABLE>


I dont have the equation for this. If you have it can you IM it to me?

 

You'll have to find it online. SOmething to do with area inside the combustion chamber. I'm leaving for the day!

 

don't forget you would not only have to customize the F23 crankshaft to accept the wider journal, but also a custom rod that has a smaller BE journal than the stanard H22 rod

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote">don't forget you would not only have to customize the F23 crankshaft to accept the wider journal, but also a custom rod that has a smaller BE journal than the stanard H22 rod</TD></TR></TABLE>

Get Crower to make me their F23 rod the length of the H22 rod, BUT I thing the r/s ratio is better with the F23 rod length. AND if I run an F23 stock piston I get 11.4:1 CR with the H22 head.

Still calculating ****.

 

Hows this-

H23 case
F23 crank
H22 rod length
Piston- 89mm
Dome- 1.00cc
Compression height- 27.50

H22 head
Oem 3 layer gasket

piston to deck height- .020 In

8000 RPM

=

11.05 CR
1.47 R/S
2414.05 CC

2147 FPS@8000RPM(mean piston speed)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC4_MADMAN &raquo;</TD></TR><TR><TD CLASS="quote">Hows this-

H23 case
F23 crank
H22 rod length
Piston- 89mm
Dome- 1.00cc
Compression height- 27.50

H22 head
Oem 3 layer gasket

piston to deck height- .020 In

8000 RPM

=

11.05 CR
1.47 R/S
2414.05 CC

2147 FPS@8000RPM(mean piston speed)
</TD></TR></TABLE>

I have run different numbers and this is the best setup, especially for the R/S and the piston to deck height.

The other option was a 89mm piston 0 dome, 28mm CH, but the piston to deck claerance was at 0. 11.4:1 CR with this setup.


I can get a little higher CR from the original by running a 2 layer head gasket.

 

why not stroke the h23/f22 crank and run shelf b-series rods with custom pistons?

The smaller pin end of the b-series rods will buy you some room on the compression height (as far as how short a CH you can get away with)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rosko &raquo;</TD></TR><TR><TD CLASS="quote">why not stroke the h23/f22 crank and run shelf b-series rods with custom pistons?

The smaller pin end of the b-series rods will buy you some room on the compression height (as far as how short a CH you can get away with)</TD></TR></TABLE>

Yes someone else mention that as well. Ill look into it.