Just wondering what the possibilities were of putting a F23 crank into an F20B. DOHC VTEC + 2.3L torque and 8k redline = possible? I don't know any info on the internals of the F20B so if anyone knows post it up. Would you need custom rods and pistons or could you use aftermarket ones? Would this even work?

 

Wouldn't it be cheaper and easier to do this instead?

 

Now that I think about it, the F23 shortblock could probably stabily support 88mm without problems due to the beefyness of the stock sleeves. That would put it at a small 2.4 liter motor. Get a company like Carillo to make some really lightweight rods and Get some custom pistons made to bring the compression up to something suitable. Knifedge the crank and balance the living hell out the entire rotating assembly. It probably wouldn't be a bad idea to get Unorthodox to make crank pulley for you as well. Port the living bejesus out of the head, and run some big cams. I'm thinking it would be an act of God to get this motor to reliably rev past about 8500 so pick the cams accordingly. Toss in some TWM ITB's and get someone to make you a good header and I'd be scared of what this motor would be capable of.

 

The F23 rods have a BE bore of 1.890 and a width of .780. The rod journals are extremely small and the rod bearings are very unstable.

Unless you plan on doing some modification to the crank ie, opening the rod journals up to house a .858-.935 width rod and for the use of GSR rod bearings $$$ I wouldnt recomend it.

Just use the H23 crank and rods


Modified by Innovation at 9:47 PM 4/30/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kendall &raquo;</TD></TR><TR><TD CLASS="quote">Now that I think about it, the F23 shortblock could probably stabily support 88mm without problems</TD></TR></TABLE>

No, not at all... Your pretty slim at 87mm (+1 over the stock F23 86mm bore) going any bigger than that isnt a good idea.

The F23 crank isnt a bad idea if you take the time to do it right. If you are looking to use it with out any mods, best of luck to you

Get the crank reworked as described above and go from there

 

So an H23 crank would work better along w/ aftermarket H23 rods and GSR bearings? Did I read that right or would F23 crank work w/ a lot of milling? I'm just trying to see which would be somewhat easier to do both physically and on the wallet. You basically posted my whole idea for it if I did it.


I've spent awhile thinking about this mostly b/c I love N/A and don't feel like joining the turbo bandwagon.

F20B
2.3L crank - worked to fit and knife edged
Rods and Pistons, unsure of - don't know what specs
ITB's
Cammed to hell
Good N/A Header
Of course fully blueprinted and balanced.

 

No, you cant use GSR bearings with the H23 crank and rods.

The F23 crank shares the same rod journal diameter as the B series (1.771) so when you open the width of the F23 rod journals up large enough to use a B series rod (from a .780 rod to a .858-.935 width rod) you will be able to use GSR bearings.

The H23 rod journal diameter is 1.888 and the BE bore of he H23 rods is 2.008 which is significantly larger than the B series jorunals/rods making it impossible to use B series bearings. You can use H22 rod bearings with the H22 crank/rods.

 

Probably just be a real bitch to tune though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlkChryKord &raquo;</TD></TR><TR><TD CLASS="quote">Probably just be a real bitch to tune though.</TD></TR></TABLE>

how does this subject have ANYTHING to do with tuning?

 

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

how does this subject have ANYTHING to do with tuning?</TD></TR></TABLE>

Let's see a 85mm motor would have to be bored to 86mm atleast, ITB's, completely NA, not to mention making sure everything fit right, machining etc. get my drift?. I wasn't talking just dynoing or standalone type of tuning. What does your post do to contribute to this thread, ABSOLUTELY nothing.

 

subscribe to thread.

Innovation has been trying to talk me out of the F23A crank idea too and I think he's almost done it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlkChryKord &raquo;</TD></TR><TR><TD CLASS="quote">Probably just be a real bitch to tune though.</TD></TR></TABLE>

Absolutely not, tuning will be the same as with any other motor.

I read your post above and noticed you were refering to parts being compatable and working/fitting right rather than tuning. Just to re assure you, following what I have posted above... everything will work perfect

 

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

Absolutely not, tuning will be the same as with any other motor.

I read your post above and noticed you were refering to parts being compatable and working/fitting right rather than tuning. Just to re assure you, following what I have posted above... everything will work perfect </TD></TR></TABLE>

thank you

 

In order for this to work this is what would need done...
F23 crank - journals widened to accept GSR bearings and can then use B series rods. Correct?

But you also said to just use the H23 crank and rods too. Would this require less machining to do? My only other concern is finding pistons that will work w/ either application depending on which way I go w/ the crank and rods. Obviously since the F20 shares parts w/ the H22 I'd be using H22 aftermarket pistons. Can you use H22 pistons on B or H23 rods?