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B3 I will say it again. I do not believe that I said my # 2&4 main bearing failure was a velocity issue. The velocity issue is an explanation for the effect of the crossover tube.
Part of my response was not addressed to you but the other recent poster who questioned why you cannot just dump a line into the pan.
He is forgetting that if you performed the crossover mod with a plug in the front as is called for there would be absolutely no oil to the front main bearing if you put the line into the pan. The line reverse feeds the front main. At least if you have performed the mod the way Larry Atherton has recommended to do it.
You are taking bits and pieces of my previous posts and assuming they are addressed to you.
I never offered an explanation for the 2&4 failure I had. I only offered that it would be one heck of a coincidence for it to not be tied to my grooved cam journals. I think the other poster has offered a possible explanation with the low pressure drop. I simply asked if everyone agrees with that explanation.
As far as I know all crankshafts have always been drilled from the main journal over to the rod bearings. I tried to emphasize to you that the position of those holes is where the improvements have been made to address timing issues and that cross drilling is no longer recommended.
I do not even use the crossover method on my own engines.
I use the Chrysler method of tubing the block.
Your comment about the external lines on a 440-1 heads.
Are we talking about big blocks or small blocks.
I have never seen a recommendation from a Chrysler engineer put in a publication to external oil the rockers until the stroker small block book came out. But I will not say it has not been done.
As I said at the beginning I am not an expert and I have not seen everything.
Rather than continue to take my posts out of context perhaps you can offer your own explanation or how about tell us how you perform your own version of the crossover line. Make a contribution.
If you would like to read a very good thread on oiling small blocks
Do a search on Mopar chat for oiling mods by a guy named Charles
Sanborn. Here is an excerpt. It is one of the best oil mod threads I have seen and I have implemented many of his mods.
