Originally Posted by
Julius
Actually the conrod does experience a very large pull force during normal running. Compression alone, and even combined with combustion are not nearly enough force to slow down the piston miving upward at 40k rpm!
Just look at a broken conrod. It is due to the bottom eye splitting open. How is that possible without a pull force?
The service is not that expensive once you factor in the fuel cost of a normal break in.
That`s why the loads endured during break-in using our method are so low, the engine is not spinning at 40k rpm. Actual real life testing shown no wear at the conrod, so no need to replace after break-in.
The splitting of the conrod is always due to fatique of the material, almost never due to stresses that are to high. And yes, it`s fatique during tension stresses.
Dont forget to put a fresh set of tyres (or better two) on the car during break-in, and the replace conrod afterwards. So with this method it is not needed to buy fuel, tyres or a conrod. Pretty cheap if you ask me.