07-11-2018, 11:53 AM
Hey, Paul. Kurt Bogerman got some bolts from K Precision, and shortened them for use in his Mac. They went in the rod a bit hard, but screwed in OK when oiled. When he went to actually assemble things, the head just popped off one bolt with almost no torque on it. Jeff Kniseley will examine the bolt when it arrives at his shop. I hope he can get things solved. I think Jeff's an honorable guy-these screws just take an awful beating in our engines. I had a chat with Dave B. last night, and he's concerned about a few issues there. if we could get one of the small-batch aerospace firms interested, we know the proper alloy to use, so a screw could be manufactured that'd be like the old US Motor Power screws that Dave designed. If USMP would install the screws in every engine they sell, the cost could be amortized over the product line. Now, if you're running a Mac, you can get the 101 spline head screws from Chuck Giacobbe, and they'll be fine. They just won't be safe in a West Bend because of the length. Ted