Quote:
Originally Posted by jcolley
Quote:
Originally Posted by rantarM3
After all the back and forth I am wondering two things:
1) What connecting rod and main bearing clearance specifications are being used by reputable stroker builders (e.g., RD Sport, Dinan, etc.)? If they have a larger clearance than OEM clearances and are using the stock oil pump with no ill effect (I've not heard of any such strokers suffering bearing failure), does that not contradict the argument that some additional clearance can be detrimental to the main bearings?
2) I wonder if the connecting rod wear that is being shown on bearing samples can also be a factor of piston and connecting rod mass. In other words, are the pistons and connecting rods too heavy for the relatively high RPM nature of this engine? It is my understanding that stroker builds generally use lighter weight connecting rods and pistons.
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I can answer the first one directly. I have had a couple of billet cranks made and waiting on an another now from the same crank shop that Dinan uses. In fact, one of the ones that I purchased from them initially was excess inventory from a Dinan production batch. Yes, those crank main journals are the same size as OEM and yes the rod journals are about .0005" smaller in diameter than OEM. |
Quote:
Originally Posted by jcolley
Quote:
Originally Posted by rantarM3
After all the back and forth I am wondering two things:
1) What connecting rod and main bearing clearance specifications are being used by reputable stroker builders (e.g., RD Sport, Dinan, etc.)? If they have a larger clearance than OEM clearances and are using the stock oil pump with no ill effect (I've not heard of any such strokers suffering bearing failure), does that not contradict the argument that some additional clearance can be detrimental to the main bearings?
2) I wonder if the connecting rod wear that is being shown on bearing samples can also be a factor of piston and connecting rod mass. In other words, are the pistons and connecting rods too heavy for the relatively high RPM nature of this engine? It is my understanding that stroker builds generally use lighter weight connecting rods and pistons.
|
I can answer the first one directly. I have had a couple of billet cranks made and waiting on an another now from the same crank shop that Dinan uses. In fact, one of the ones that I purchased from them initially was excess inventory from a Dinan production batch. Yes, those crank main journals are the same size as OEM and yes the rod journals are about .0005" smaller in diameter than OEM. |
These last two posts are quite interesting. Fresh thinking that makes sense and we are not focusing on it is shocking. I had the exact same question before seeing rantarM3 post his two questions. I'd like to hear more, after all, it seems like the bearing problem is solved on the Dinan but there are no claims of it.