F23 Internals Info

[BlkCurrantKord]

Requested that this be stickied from another thread...

Crower Rod Comparison between F23 and K20:

B93749B-4 F23 5.551 1.890 0.780 0.866(22mm) 0.780

B93733B-4 K20A3 5.453 1.890 0.780 0.866(22mm) 0.780


First number is the length. (the only difference between the two)
Second number is the bottom end or BE bore. (the larger end that connects to the crankshaft)
Third number is the BE width.
Fourth number is the PE or pin bore. (smaller end of the rod that connects to the piston)
Fifth number is pin width.

Other:

Stock Bore - 86mm (3.385)
Stock Stroke - 97mm (3.818)
Rod Length - 5.551
Rod Width - .780
BE Bore - 1.890
Rod Pin Size - 22mm (.866)
Crank Mains - 55mm
Rod Journal Diameter - 1.771
Block Deck Height - 8.643
Piston Compression Height - 1.181 (Same as K20/K24)
Piston Volume - (-)14cc's
Combustion Chamber Volume - 50cc
Intake Valve - 34mm
Exhaust Valve - 29mm
Head Gasket Thickness - .026
Stock Rod/Stroke Ratio - 1.45

F23 stock rod length = 141mm (5.551in)
K20a3 stock rod length = 139mm (5.453in)
Eagle K20a3 Rod @ .030in longer = 146.1mm (5.753in)

For comparison
H22 stock rod length = 143mm (5.636in)
H23/F22 stock rod length = 141.50mm (5.580)
F20B stock rod length = 145.0mm (5.708in)


Helpful Links

- http://www.clubcivicquebec.com/compression_calculator_hfserie_f.php

- http://www.bsperformance.com/compcalc/compcalc.htm

- http://www.zealautowerks.com/hfseries.html

 

[Belgian CG4]

I'm just doing some research and found this compression calculator:

http://www.bsperformance.com/compcalc/compcalc.htm

So it seams the F23A1/4 has -13,6 cc piston dome displacement and the F23A5 has the -18cc's as listed above.

Maybe important for some

 

[WhiteAccord]

arent the A5 Ulev?

 

[Belgian CG4]

I guess so. I believe the A5 was never in the coupes, only in sedans.

 

[Kid2000EX]

A5 has no vtec

 

[WhiteAccord]

Ahhh yes that was it....

 

[BlkCurrantKord]

So you guys have an idea of what PE Bore and BE Bore are and for anyone that doesnt know what a rod looks like.

PE Bore - end that attaches to the piston

BE Bore - the end that attaches to the crank

F23 Crower Rod

 

[thejameshimself]

...someone needed and excuse to show off their new rods

 

[BlkCurrantKord]

Nah, I've had em for almost a year now and have posted them before.

 

[Roadrage]

Lol