Hey guys I need to know a measurement on an H22 rod.

I need the diameter of the ROD JOURNAL.

I just got my F20B rods and I think I found something very interesting....

 

What nobody has stock rods laying around?

 

I don't know if this is right but i think its 51.0 mm or 2.01 in

 

C-to-C length - 5.636"
B.E. bore - 2.008"
B.E. width - 0.935"
Pin Diam. - 0.866" (22mm)
Pin Width - 0.940"

taken from http://www.crower.com/cat/import/honda/rods.shtml

 

Hey when I measure the B.E. bore (what does B.E. stand for?) the rod journal thing do I measure from the actual rod or from the bearings?

 

what did you find out????

as for the measurement of the rod, the big end is 51mm, that is measured w/o the bering in place

 

What I found out is that the F20B rod big end is 48mm...which means an even longer rod...

 

I don't understand. How does this make it longer. The length of the rod is measured from the center of the big end to the center of the pin end. The size of the big end has nothing to do with the length, you can reduce it to 2mm and still maintain the length. Is there something else I'm missing, or are you measuring the length yourself?

EDIT. I think you think the actual length of the rod part is what you want, when it's really the distance between the pivot points that matter. The size of the ends doesn't effect this.


[Modified by DirtyLude, 10:45 AM 11/21/2002]

 

Sure it does. the distance from the center of the big end to the circumference of the rod would be shorter.

To make an equivalent deck height would the rod not have to be longer to compensate? Think about the rod/crank at TDC...if the rod journal thing is 3mm smaller, wouldn't there be 1.5mm of rod length extra to be on the rod, in addition to what I had already calculated?

 

I don't understand, how did you original calculate this? If you used proper rod length from centre big end to centre little end, the diameter of the ends and the length of the actual metal connecting part means nothing to the calculated length of the rod. Yes, if you want to maintain the same length when you decrease the diameter of the ends, metal between the ends will increase, but you're still maintaining the same length. Stroke is measured from the centre of the crank journal to the centre of the rod journal, so the size of the journals means nothing to the calculated stroke, either.

I guess I'm not understanding how you're calculating this.

EDIT: I wish I could draw pretty pictures on my work computer. This probably doesn't help at all, but; calculated rod length is between pivot points. The actual length of steel between the two ends doesn't mean anything:
http://www.crower.com/pdf/156.pdf


[Modified by DirtyLude, 11:31 AM 11/21/2002]

 

I think he means that if the rod is 4mm smaller end then the h22 the crank would be the place where the material would have to come off to make fit. So no you have a smaller crank face (where the rod connects) even with bearings in the straight up/down position you will have a rod that starts 2mm lower than the h22 one. Because of the material that is off the carnk to make the smaller rod fit, the rod would have to be longer by a couple mm to make the piston come all the way up to the top. At least that's what I think he's saying. IMO since it's the f20 crank it wouldn't make a difference because the rods were meant to go on it in that block.

 

The wrist pin diameter is the same(22mm), while the diameter of the bottom of the rod is smaller...


....WAIT A MINUTE! Okay I no exactly what you are saying Mark! You are exactly correc the C-to-C length will be the same it's the amount of rod material that changes.

Thus the rod length is what I calculated at 145mm...and a RS of 1.65 still good.

 

B.E. = Bearing End

 

More commonly B.E. = Big End