Eating 2 and 6 rod bearing

I have a customer with an issue I don't quite get.

4.440 bore x 4.500 stroke ... puller

2 different blocks
2 sets of rods
First crank was a scat, second was an Eagle.
Melling pump

He's eaten 2 and 6 rod bearings three times.

I'm getting a pic of the oil pan, but that seems a each.

Any ideas why, before we throw a bunch of money at it and have the problem repeat?

How high is he spinning it? What journal size and what bearings?

Wet or dry sump? What rods?

n/a? turbo? Roots blower? n2o?

Mark O'Neal wrote:I have a customer with an issue I don't quite get.

4.440 bore x 4.500 stroke ... puller

2 different blocks
2 sets of rods
First crank was a scat, second was an Eagle.

He's eaten 2 and 6 rod bearings three times.

Any ideas why, before we throw a bunch of money at it and have the problem repeat?

Make sure his big truck puller camshaft and roller lifter combination are not such that the skirt of the lifter body is getting raised up so high it momentarily exposes the lifter oil gallery to the crankcase during peak lift, effectively dumping oil back to the pan (down the lifter bores) rather than being sent to its terminal points.

BigBlockRanger wrote:n/a? turbo? Roots blower? n2o?

I'm guessing N/A since he mentioned it's a Puller but i could be wrong!!

does he have a data logger to know what the oil pressure is doing during the pull?maybe he needs an a-460 block !

Paul Kane wrote:

Mark O'Neal wrote:I have a customer with an issue I don't quite get.

4.440 bore x 4.500 stroke ... puller

2 different blocks
2 sets of rods
First crank was a scat, second was an Eagle.

He's eaten 2 and 6 rod bearings three times.

Any ideas why, before we throw a bunch of money at it and have the problem repeat?

Make sure his big truck puller camshaft and roller lifter combination are not such that the skirt of the lifter body is getting raised up so high it momentarily exposes the lifter oil gallery to the crankcase during peak lift, effectively dumping oil back to the pan (down the lifter bores) rather than being sent to its terminal points.

Long shot, shot in the dark along the same line. Maybe all off base to.

Have the roller lifters been slot or tick notched to get more oil to the rockers?

If so could they have gotten in the same lifter bores on the second block and the notch's are deeper and they are oiling those rockers more there, instead of those mains?