Looking at my crank and chart in the helms manual as well as help from a friend at acura to determine the rod bearings needed for my piston install, i was able to conclude that i need all Brown and one Green. (this is for a 97 type-r USDM) so i ordered the bearings with help from a friend at Acura, and i recieved all Brown bearings. My question is this:

The one rod that requires half of the bearing to be green, will it matter if both halves of the bearing are brown?

thanks in advance

LSR

 

How did you get that only one half needs to be green? The letters on the block and numbers on the rods, cross reference on the chart to one color. And thats the color for the whole bearing, both halves.

-Ace


[Modified by Aceman64, 8:54 PM 7/17/2002]

 

its different for the B18C5....in the HELMS manual......

LSR

 

Does not matter; after the two halves are in, it should be a perfect circle (Well not really, but you know what I mean)

 

You CAN mix different color halves together as long as they are next to each other in the color scale.
ie you could put a green and brown together or a green and yellow together. Makes an adjustment of .0001. Why you would WANT to do this is for another post

 

Be sure to plasitguage it. You problay better off with the brown instead of green. You never know you may even need to use blacks for the browns. I have a 99 crank with low miles and I had to take 1 to 2 steps up on several bearings.

 

Earl, I'm interested about the WANT part. How about more info on this ?

 

Hehe..I'm not sure I want to get into this with everyone. Everyone has an opinion on bearing clearance. JG sets all his clearances at .002 and Helm starts at around .0015. Everyone else is probably in between although some may have great luck outside those numbers. People spend a lot of time and $ adjusting their bearing clearance, (with the unexact art of plastigage), from .0016 to .0017. I feel the engine won't care or know the difference. Just an opinion, however.

 

Is there a better way of measuring the clearance ?

 

Yes. The proper way is to use micrometers. Torque the cap on the rod without the bearing in place. Measure the inside id of the big end of the rod. Take a bearing mic and measure both halves of the bearing. Next mic the diameter of your rod journal. Subtract those 3 measurements from the rod id and what is left over is clearance. That's why when you switch rods, the colred id rod bearings don't work anymore. Example:
Rod bore 1.8914"
Bearing half -.0593"
Bearing half -.0592"
Rod journal -1.7709"
Clearance .0020"
The math is easy, taking the measurements to the nearest ten thousandth of an inch is very hard. How accurate do you think a little piece of crushed green plastic is going to be?