Piston/Bearing Grade selector Spreadsheet and questions!

[sil80drifter]

Here is a bearing and piston grade calculator spreadsheet for the KA24E (should be the same for the DE as well). The names and information as to what grades to use comes directly from my 1990 240SX FSM.

Here it is: http://fiznat.000k2.com/superc...e.xls

Right click and “save as.”Thanks to fiznat (from NICO) for hosting the file and naming it like it should be named.

When you need to get stock pistons/bearings for the KA, they each have a grade number corresponding to their sizes. This spreadsheet will help you figure out what grade bearings and pistons you need to get, according to the information stamped on your engine block, ASSUMING THAT THEY ARE ALL STILL IN GOOD SHAPE AND CAN BE REPLACED WITH THE SAME TYPES, WITHOUT ANY MACHINE WORK BEING DONE (aside from honing to get the rings seated well, but this has nothing to do with piston or bearing machining).

What I myself am confused about is that when you order pistons or main/rod bearings, they don’t really give you an option to select the grade. It seems that they will all be the same grade, and in fact most after market OEM sellers do not even list the grade number as a parameter in the listings. All they list is what the sizes are, like stock, 0.02 over, 0.04 over, etc.

SO! Can anyone answer this:

For pistons, what do the grades 0,1,2 correspond to?For rod bearings, what do the grades 0,1,2 correspond to?For main bearings, what do the grades 1,2,3,4 correspond to?

Do the piston grade numbers have anything to do with stock size, 0.02 over and 0.04 over?And the bearing grades for the equivalent of oversized bearings?

How does one order different grades/sized then?

Look at this site where I was planning on ordering my rings/bearings (I’ll keep my pistons they are in good shape):

http://www.hybridka.com/ebearing.htmhtt ... piston.htm

http://www.importperformancepa....htmlhttp://www.importperformancepa....html

So how do I know what size I need, based on the grade numbers?Btw my piston/bearing grades are as follows:Main bearings (1 to 5): 3 3 1 3 3Rod bearings (1 to 4): 2 2 2 2 Piston grades (1 to 4): 1 1 2 2

Also, does anyone know which are better, Toga or Topline?

Thanks for your time and hope the worksheet helps whomever needs to select bearings and pistons (once we get this hosting and size correspondence issue squared away.)

sil80
Modified by sil80drifter at 11:40 PM 2/8/2005