Originally Posted by
snuvet75
The play as the hole in the conrod will get larger as you run the engine. That, I get it. But what does changing crankpin have to do with changing conrod directly? Don't we change the conrod because we're afraid that it might break as it wears? Not necessarily because the hole enlarges?
I'm just asking you guys about correlation between end of rod's life and hole size. If the play is larger, then obviously there will be more stress on the rod as it moves up and down but is that the whole reason why the rod breaks?
The crankpin does wear off also. If the play becomes too much then the head clearance does become smaller with the risk of blowing glowplugs. But the play will also give more banging of the crankpin on the rod causing more wear and weakness in the material.
Originally Posted by
snuvet75
If I install Bonito 7port sleeve into keep on crankcase, would that work? The port config is same as Keep on sleeve but 2 less ports. The main port to the rear exhaust in the Bonito sleeve is a bit smaller than Keep On's. The rest is original keep on parts. I've always been afraid of making Frankenstein motors but I figured I might as well try that combo cuz otherwise not really worth keeping them separately.
A Bonito has a lower port timing than a keep on so you will not get the same performance. And it is wise to check the head clearance. But yes, it can be done.