Cam Bearing Failure #4
Posted: January 9th, 2018, 1:03 pm
I have used this site for much of my build and it has very helpful information. I read all the way through silverxj's posts about his cam failure. Here is where I'm at and if there are any other suggestions I would really appreciate it. I keep finding small things to change and hope for the best but nothing has worked. I'm so disappointed in this but at this point I have to much money invested into this project to for go it. Least I'm removing and installing my self.
I have a built 4.6 stroker pretty much every year now since 2014.
Some of the specs:
1998 4.0 block bored .030 over
4.0 rods, Icon pistons
scat crank
68-232-4 comp cam with lifters x2 (replaced it once to make sure it wasn't the problem)
Made a cam pin that came out to .005 play in cam as suggested by Silverxj
Edelbrock head with the springs re worked to 1.750 installed height 105# on the seat, at .480 open 260#, .180 from coil bind
Teflon coated cam bearings with oil control bearings
Magnafluxed block
Checked straightness of cam tunnel
I just ran the last install for about 100 miles, oil pressure cold starts at 50 and drops to 10-8 psi when hot. Drained oil and found metallic oil and copper bearing material in oil filter when I cut it open. I have used zddp, different oils everytime when suggested by someone else. This last time was 5w-30 and then 15w-40 after running for 10 minutes.
Used 10w-30 last time which only lasted the break-in of the new cam. After the last time changed springs in the head to the ones listed for this time.
I'm thinking I need a new block just wondering if anyone else has any other suggestions. It has been through with a fine tooth comb and haven't found the culprit.
I have a built 4.6 stroker pretty much every year now since 2014.
Some of the specs:
1998 4.0 block bored .030 over
4.0 rods, Icon pistons
scat crank
68-232-4 comp cam with lifters x2 (replaced it once to make sure it wasn't the problem)
Made a cam pin that came out to .005 play in cam as suggested by Silverxj
Edelbrock head with the springs re worked to 1.750 installed height 105# on the seat, at .480 open 260#, .180 from coil bind
Teflon coated cam bearings with oil control bearings
Magnafluxed block
Checked straightness of cam tunnel
I just ran the last install for about 100 miles, oil pressure cold starts at 50 and drops to 10-8 psi when hot. Drained oil and found metallic oil and copper bearing material in oil filter when I cut it open. I have used zddp, different oils everytime when suggested by someone else. This last time was 5w-30 and then 15w-40 after running for 10 minutes.
Used 10w-30 last time which only lasted the break-in of the new cam. After the last time changed springs in the head to the ones listed for this time.
I'm thinking I need a new block just wondering if anyone else has any other suggestions. It has been through with a fine tooth comb and haven't found the culprit.