i thought some place i had read that the ctr crank was different then the regular b16a crank???
thanks

 

probably got larger counterweights and hence heavierthan the b16a just like the itr crank compared to the gsr

 

thanks sgt

 

I remember seeing somewhere that the R bearings are actually thinner than the regular ones....reduced friction, I guess.


[Modified by Lsos, 11:25 PM 3/31/2003]

 

the pin journals for the rods on the B16B crank are the same width as those on the B18C cranks, so you can't use the (wider) B16A rods/bearings on the B16B crank.

Honda made the B18C and B16B cranks and rods from stronger alloys than the others, and the rods are thinner (and lighter), reducing rotational/reciprocal mass (farther from the axis of rotation), and to allow for yet a stronger crank, helpful for the higher-revving VTEC engines. Honda fully counterweighted the 'R' cranks for better balance.

since there is actually a higher load/friction on the smaller pin journals and rod bearings due to the smaller surface area, Honda designed the B18C/B16B rod bearings to have micro-crystalline surface structures resembling adjacent rows of pyramids, which hold more oil than the conventional bearings, yielding higher lubricity with the same configuration, specs, and clearances, especially at higher rpm.





[Modified by slofu, 4:15 PM 4/1/2003]

 

I think the b16b rods are longer than the b16a rods.

 

There were some SAE papers written about the "new" bearing construction in the B18C motors. I am sure that since the B16b block is essentially a B18c block, the crank has the full counter weights and thinner rod journals of the B18c crank with the shorter stroke of the B16a crank. I think that Frank Lin had the pieces of the SAE papers posted on his old site.

 

correction made. the b16b rods are longer than the b16a rods, since the b16b block is the same as the b18c (taller than the b16a block, and the b16a/b stroke = 77mm).