Custom 408W in a cobra replica with about 3000 miles total on the motor. I built it with all new parts except the 1982 block. Full machining with line hone, head decking, etc. It has AFR 195 heads. About 1500 miles ago I had to completely rebuild the heads. TWO spring failures (one intake, one exhaust, one on each side) required me to replace all intake valves, 2 exhaust valves, all springs, and all valve guides. No idea why the springs failed. I've checked spring height, seat pressure, verified lift, pushrod length, etc.
Anyway, after the rebuild, I ran Castrol Dino 10W-30 for about 200 miles, then drained, replaced the filter (WIX) and switched to Valvoline VR1 10W30. This oil had about 1000 miles. After I replaced the oil, I noted the motor was pinging a bit. I have reduced the timing to eliminate the pinging.
I'm not sure where the Aluminum, chromium, Iron, Copper, and Silicon is coming from. Not sure if it is left over from the rebuild or something new going on. I run a K&N air filter with a PCV system so I don't know where dirt/silicon could be getting in.
While draining this oil, it looked a lot darker/dirtier than the previous Castrol, so I went back to Castrol (white bottle). It also seems to run smoother/quieter with the Castrol. It has roller lifters and rockers, so I don't really need the increased Zinc of the VR1.
Any thoughts? Where do you think this combination of metals is coming from?
Code:
Aluminum 26
Chromium 8
Iron 61
Copper 19
Lead 5
Tin 1
Molybdenum 22
Nickel 1
Manganese 2
Silver 0
Titanium 2
Potassium 4
Boron 29
Silicon 236
Sodium 285
Calcium 2016
Magnesium 11
Phosphorus 1127
Zinc. 1319
Barium. 0
SUS 58.8
cST 9.89
Anyway, after the rebuild, I ran Castrol Dino 10W-30 for about 200 miles, then drained, replaced the filter (WIX) and switched to Valvoline VR1 10W30. This oil had about 1000 miles. After I replaced the oil, I noted the motor was pinging a bit. I have reduced the timing to eliminate the pinging.
I'm not sure where the Aluminum, chromium, Iron, Copper, and Silicon is coming from. Not sure if it is left over from the rebuild or something new going on. I run a K&N air filter with a PCV system so I don't know where dirt/silicon could be getting in.
While draining this oil, it looked a lot darker/dirtier than the previous Castrol, so I went back to Castrol (white bottle). It also seems to run smoother/quieter with the Castrol. It has roller lifters and rockers, so I don't really need the increased Zinc of the VR1.
Any thoughts? Where do you think this combination of metals is coming from?
Code:
Aluminum 26
Chromium 8
Iron 61
Copper 19
Lead 5
Tin 1
Molybdenum 22
Nickel 1
Manganese 2
Silver 0
Titanium 2
Potassium 4
Boron 29
Silicon 236
Sodium 285
Calcium 2016
Magnesium 11
Phosphorus 1127
Zinc. 1319
Barium. 0
SUS 58.8
cST 9.89
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