Cox .049 crankcase bushing

After I saw the Cox .049 bushed crankcase done by Iceberg I decided to do the modification on a few of mine. I made a fixture to hold the crankcase in my Sherline lathe.  After setting it up and making sure I had the case aligned correctly I drilled the case first with a .250 inch drill bit and next with another .275 inch drill bit then I used a boring bar to make the hole in the crankcase .300 inch. Then I made a bronze bushing about .302 inch with an inside Diameter of .2170 since I`m using the Hi performance diesel/venom style crank. I finished the job and tested the case with some parts that I have. the engine turned above 19,000rpm which was a surprise since all I wanted was to check for metal residue in the oil coming from the front of the case. Here are some pics.  Also I was posting on the 1/2a building forum at Stunthangar I`m posting a link to the thread in case you want to read all I went thru in this mod.I posted a more pictures there than I have posted here. I received help and advice from some of the guys there.

https://stunthanger.com/smf/12-a-building/cox-049-piston-lapping/?all


                                                                                                                          Juan

https://stunthanger.com/smf/12-a-building/cox-049-piston-lapping/?all