Honda teased us with the F23 crank. They gave us a large stroke F series crank with 55mm mains, which is great. But, for some reason they decided to use a very narrow rod journal/rod combo with a fairly tight bearing to journal clearance ::scratches head::

This is in no way ideal for a performance oriented application.

So, to solve the problems of the F23 cranks I started having them reworked to accept the .935 width B series rods and B series bearings. Being that the F23 and B series journals are the same diameter (1.771) opening the journals now allows you to select from the wide range of available B series shelf and custom rods while giving you the freedom of using OE LS or GSR rod bearings as well as aftermarket B series rod bearings such as the ACL competition series.

With out giving away exact specs/figures, the process is simple. Material is removed from both ends of the journal to widen the journal surface.

Example (Stock F23 vs Reworked F23):



Side by side (Stock F23 vs Reworked F23):


And heres a pic of the rod caps to compare the rod widths between the 2 (F23 vs LS):



And another pic comparing the differences in bearing widths (F23 vs LS)



Pricing to have this done is roughly $400-$600 which will include heat treating of the rod journals.

For anyone looking to build a big stroke street or drag motor using the F23 crank as a base, this is definitely something worth looking into.

 

Is that my new crank?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point6 &raquo;</TD></TR><TR><TD CLASS="quote">Is that my new crank?</TD></TR></TABLE>

yup

 

Sigh, just wish I could be convinced that this crank would last in roadrace motor.. As much as I would love to build it!

 

nice work ..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point6 &raquo;</TD></TR><TR><TD CLASS="quote">Is that my new crank?</TD></TR></TABLE>

So what's the setup going to be Scott? I thought that back in the day you used the F23 crank and it did not work well. What's this going in? Have you got some custom rods for a decent R/S ratio? Looks good..

rick, is that crank done? Has it been balanced/polished? Just curious how well that crank is balanced from the factory.

Pirate

 

The crank wont be balanced until the rest of the parts for the rotating assembly are done.

For now the journal work was performed, heat treated and cryo frozen.

Scott's new set up is going to be bad ***, I cant really say too much about it in terms of specifics...

I will say this much though:

New crank, rods, pistons, cams and a few other goodies are in the works... Bigger motor, more power!

 

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

So what's the setup going to be Scott? I thought that back in the day you used the F23 crank and it did not work well. What's this going in? Have you got some custom rods for a decent R/S ratio? Looks good..

rick, is that crank done? Has it been balanced/polished? Just curious how well that crank is balanced from the factory.

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

I will ge to the set up on a later date, but as far as me stating the "f23 or h23 cranks don't work well" is untrue. I have built many H series using them they have been running well for years now.

 

My mistake. I hope it goes well for you.

Pirate

 

I've thought about this before but didn't know if it was possible... Opens up a whole new world...

 

Some idiot just IM'd me on AIM just to say:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Idiot on AIM &raquo;</TD></TR><TR><TD CLASS="quote">Your retarded if you think anyone is going to believe that H22A4 crank you posted is actually a modified F23. What a Dushe.</TD></TR></TABLE>

So for whoever that was...

Stock F23 crank vs H22A4 crank:



As you can see, the counterweights are WAY different between the 2 cranks... Not to mention the rod journal diameter on the F23 crank is a lot smaller (1.771) than the H22A4 (1.888)

 

LOL... what a dipshit. That looks like the H22a4 crank I just sent you. It even has my hand writting still on it...


Modified by 2point6 at 2:33 PM 7/11/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point6 &raquo;</TD></TR><TR><TD CLASS="quote">That looks like the H22a4 crank I just sent you. It even has my hand writting still on it</TD></TR></TABLE>

It is in fact, my other one is getting prepped for the article as we speak

 

I have posted it before but here is another F23 crank. Nothing like an H22.



It might not show up very quick though, we-todd seems to be running real slow at the moment.

Pirate

 

sounds like fun....

who is gonna grind the cams? (if you dont mind me asking)

 

damn...thats some serious sh*t....good job man

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">(if you dont mind me asking)</TD></TR></TABLE>

I do

 

I want one do this to my F22 crank

 

If you want to go 98mm or 92mm, then I can help you with that

 

wow.....very interesting.

Anyone have a F23 crank they want to sell?

 

f23 modified crank + B-series rods= what displacement?

 

Bore and Stroke are the only factors used when calculating displacement, rods can be whatever length you want and it wouldnt make a difference.

 

subscribing... this thread could get interesting

 

- how much stroke is 2point6's current crank? what bore?

-also, in terms of the block, what determines a high rev-range? is it mainly r/s ratio and the mass of rotating components?

 

Innovation,


A few months ago you told me the counterweights were inadequate (too small) for high rpm duties...

Do you still think so?