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      09-27-2013, 03:10 AM   #85
Yellow Snow
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Drives: 335d Coupe. Stock no more!
Join Date: Mar 2008
Location: Newcastle

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RG: In your original M5 board teardown thread, it says the Carillo rods were the same thickness as the S65 rods and they were only reground for the specifics of the stroker build. Nothing was said about only having a .003" side clearance.

If the standard side float is deemed as being too little, wouldn't Carillo make their rods thinner?

Did Van Dyne say at the time that this would cause a problem on a stock engine?

http://www.m5board.com/vbulletin/e90...r-motor-2.html

Anyway. I have done some more accurate measurements of both the red and blue bearings and have found them both to be almost exactly the same size! This must mean the discrepancy between the two must be down to material softness.

Measuring a soft bearing is difficult with a mic of any sort. I measured the same bearings with a mic and found them to be different.

To get an exact no quibble size, I set up a reference grade 2mm slip gauge at 20 degrees C.



Red bearing is .0003" (3 tenths) smaller than 2mm. ie .07844" or 1.992mm



Blue bearing is pretty much exactly the same. which gives a total .0006" (6 Tenths) clearance on the nominal sizes, plus journal and rod clearances .


Last edited by Yellow Snow; 09-27-2013 at 05:50 AM..
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