Loves302Chevy
"One test is worth a thousand expert opinions."
After reading through all these oil related threads, I read that more than 1600 ppm ZDDP , over a long period of time, can cause potential chemical wear of the cam lobes and lifter faces.
Also earlier oil industry testing found that above .14% or 1,400 ppm, ZDDP INCREASED long term wear, even though break-in wear was reduced. And it was also found that .20% or 2,000 ppm ZDDP started attacking the grain boundaries in the iron, resulting in camshaft spalling.
http://www.drivenracingoil.com/news/dro/training-center/articles/zinc-in-motor-oil/
And using zinc/phos levels this high could be cause for concern, since excessively high levels, used for more than just break-in, can cause engine damage rather than prevent it.
I have 3 totally rebuilt and fully complete SB Chevy engines sitting in my basement. After each was assembled, I filled each of them with the recommended break-in oil mixture for that time period (mid 80s - late 90s), which was conventional SAE 30 non-detergent racing oil and a bottle of EOS. I can't remember, but there might be some STP and/or MMO in there also. Of course the cam & lifters were coated with Crane Cams cam lube.
I successfully did each break-in on my engine run-in stand. After everything was adjusted and tuned to my liking, I put each on a dolly and they are sitting in the basement. Except for an occasional running on the test stand to exercise them, some have been sitting with the break-in oil still in them for 20 years.
Do you think that there is any chance that the high levels of Zinc and Phosphorous can be damaging these engines?
Also earlier oil industry testing found that above .14% or 1,400 ppm, ZDDP INCREASED long term wear, even though break-in wear was reduced. And it was also found that .20% or 2,000 ppm ZDDP started attacking the grain boundaries in the iron, resulting in camshaft spalling.
http://www.drivenracingoil.com/news/dro/training-center/articles/zinc-in-motor-oil/
And using zinc/phos levels this high could be cause for concern, since excessively high levels, used for more than just break-in, can cause engine damage rather than prevent it.
I have 3 totally rebuilt and fully complete SB Chevy engines sitting in my basement. After each was assembled, I filled each of them with the recommended break-in oil mixture for that time period (mid 80s - late 90s), which was conventional SAE 30 non-detergent racing oil and a bottle of EOS. I can't remember, but there might be some STP and/or MMO in there also. Of course the cam & lifters were coated with Crane Cams cam lube.
I successfully did each break-in on my engine run-in stand. After everything was adjusted and tuned to my liking, I put each on a dolly and they are sitting in the basement. Except for an occasional running on the test stand to exercise them, some have been sitting with the break-in oil still in them for 20 years.
Do you think that there is any chance that the high levels of Zinc and Phosphorous can be damaging these engines?
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