Emerica1975 wrote:Thanks for the pictures. Are they aluminum? How are they secured inside the crankcase. How thick should they be? And do you have a suggestion on how to layout a pattern to the correct shape. Sorry for all the questions and I understand if it’s all trade secrets but I gotta try?
Yes, aluminum for lightweight and no rust. >.290" to .305" thick depending on how close your flywheels are to each over after truing. It all varies, if you are using flyhweels that use a straight crank pin. Not so much if ya have the early or the later crank pin with shoulders It's not a trade secret. You have the cases where you can get the dimensions. Machine you an aluminum ring that is the diameter of the recess in your left case half. (5.525" if I remember correctly.) I.d. of the ring will be about 3.875" for the 175 motors, and another .062 less for the i125/165 flywheels. Once you have that done, you'll need to machine a lip on the outside diameter of the plate. It wont be centered. The lip (approx. .055" thick, measure your own case recess) leaving .002" less for clearance) will fit into the recess in your case and the plate will be centered in each case half. Once that is done, lay the stuff in the case recess and mark the mouth of the cases onto the ring and cut that much away, for the rod to clear. Once ya get that far, let me know and I'll type how to locate and pin the plate into the case