hey guys i am finishing up my engine build and im down to choosing bearing sizes. i just had my block align honed and the crank balanced and polished. while i was getting the h23 sleeved the block cracked so the mechanist used a h22a4 block, so im alittle confused on which bearings to choose. the mains were honed to 59.02mm and the mains on the crank, crank pulley side to flywheel
1) 50.01mm
2)50.01mm
3) 50.02mm
4)50.00mm
5)50.00mm.
the rods are crower with 51.00mm big end with crank again same order
1) 48.00mm
2) 48.01mm
3) 47.99mm
4)48.00mm.
if anyone could help me out that would be greatly appreciated.

thanks for reading

 

i dont understand what those numbers represent.

 

sorry i was trying to give the measurements of the main journals, rod ends and each crank section that would sit inside the bearing. what would be a better way to measure them?

 

that sounds like you were measuring right, what you also need to include is what the std. size of the journals and bores should be.

 

You need to use plasti-gauge and bearings with a known size, not used. Judge the size of your new bearings, on the oil clearance specified in the HELMS.

 

Since no one has measured and/or posted H-series bearing thickness (that I know of), you'll have to buy a few different colors and see what measurements you get on those. Try posting a thread in the All Motor forum regarding H bearing thicknesses first though. Considering all the H22 engine builders, someone has to have that info.

 

The H series Bearing thinknesses are available.

MAIN BEARING THICKNESS
Blue: 2.013 - 2.010mm / 0.0793 - 0.0791
Black: 2.010 - 2.007mm / 0.0791 - 0.0790
Brown: 2.007 - 2.004mm / 0.0790 - 0.0789
Green: 2.004 - 2.001mm / 0.0789 - 0.0788
Yellow: 2.001 - 1.998mm / 0.0788 - 0.0787
Pink: 1.998 - 1.995mm / 0.0787 - 0.0785
Red: 1.995 - 1.992mm / 0.0785 - 0.0783

Heres what i get out of it.

The machine shop used a H22a4 block which has 55mm mains, your using a H23 crank which has 50mm mains. You need a h22a4 crank now, or a F23 crank. Also if they honed the block out to 59.02mm and you get a crank that has 55.01mm journals (just for say)

Then take the 59.02-55.01 = 4.01 4.01/2= 2.005

Now figure out what bearing clearance you want *look at your manual*
Take 2.005 and subtract the bearing clearance you want.

And then that number is what you want to use to find the bearing color in the above chart.

 

yeah sounds like they set you up with the wrong block if it is measuring 59mm. that sucks!

 

thanks for replying guys. so i have the wrong block? if thats the case looks like the mechanist will be buying a new one. but just to make sure. from the second measurements i came up with; journals were 2.3236" crank was 1.9690" and a 0.0020" clearence i would need the bearings to be 0.17705" for the mains. rods were 2.0075" crank was 1.8900" with same clearence each side would be 0.0585" for the rods. the mains seem to be really big, so im assuming that block will not work with my crank like you guys said.

 

Correct, the 50mm main crank will not work in the 55mm main block. As Lude@Heart mentioned, you will need a 55mm main crank (f23-97mm stroke or h22a4-90.7mm stroke) to be able to use the block.

 

A .02 mm spread on the grinding tolerances? Is this normal to you guys? Sorry, I'm more of a domestic guy. But I'm also a machinist (toolmaker), .004 mm is an acceptable tolerance where I come from, maybe a .01 mm spread accross the journals would be a lot... .020 mm and I would have my *** handed to me.

 

No hes saying that his crank has those tolerances. Maybe the crank is a little out of round. His block he said was machined to 59.02 on all 5

I Recently Miced my Brand new from Honda Crank and got:

Main Journals:

1. 1.9688”
2. 1.9688”
3. 1.9687”
4. 1.9687”
5. 1.9687”

Rod Journals:

1. 1.8899”
2. 1.8898”
3. 1.8898”
4. 1.8899”

Anyone care to convert that to mm's?

 

They didn't grind the crank, only micropolish.

Those are just single journal diameter measurements that he posted. You can't judge roundness without two or more measurements per journal.

It's a good idea to have the crank checked for alignment, and journal roundness and taper since used cranks aren't always in spec. The specs and procedure (which is standard) are in the helms.

As for lude@heart's crank:
www.onlineconversion.com 1.9688"= 5.0075mm, 1.9687"= 5.005mm

 

1.9688" = 50.00752mm
1.9687" = 50.00498mm
1.8899" = 48.00346mm
1.8898" = 48.00092mm

Your parts have a nice tolerance, they are all within 4um. The other guys parts are floating around by .020mm?
1 inch = EXACTLY 25.4mm (don't divided by .03937 when your doing precision machining)
inches X 25.4 = milimeters