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  #121  
Old April 26th 2011, 12:39
IMPI IMPI is offline
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I also wouldnt worry about those lifters. From my own research cams are not really hardened in the sense that they get heat treated to a specific rocwell number. the lobe and follower must be the same or very very close on the hardness scale so that the one may not wear/dig into the other. as the cam an lifters break in this constant motion against each other hammers both surfaces and this hardens the cam surface. a good example is you bending a piece of wire repeatedly as this is done the wire becomes stiifer and eventually breaks. This same process happens with the cam and the lifter and cam becomes progressively harder with use antil the surface is so hard that flabes come off it and this is the pits commonly seen in worn cams and lifters. the pits in your lifters do not resemble that type of pitting as it usually has very sharp edges.

Parkerising as a method does not harden the cam but actually etches the surface uniformly this slightly rough surface is used for two reasons: it retains oil due to the microscopic pits in the metal and also aids in corrosion protection (it was developed as a low cost method of protecting weapons by the US Army)

On your lifters the fact that the photos show them to have rotated is possibly the best news as this mean that the cam and lifters are happy with each other. the moment the lifter stops rotating even the best cam and lifter will be destroyed.

The slight pits is actually good as it will retain lubricant much like the grooves in a bearing.
Armand
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  #122  
Old April 26th 2011, 15:10
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NO_H2O NO_H2O is offline
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Lube them back up on the faces with cam/lifter lube. Oil the sides and put them back in the same bores they came out of. Make sure you are using an oil with 1200 ppm ZDDP or higher and do the break-in run again (3K rpm for 30 min.) and see if they are still turning and have no hack marks on the faces.
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  #123  
Old August 3rd 2011, 12:37
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Quote:
Originally Posted by vdubzack View Post
after break-in put some ZDDP additive in the oil to protect it from further wear.
ZDDP should be added just after the break-in? I'm planning to use it during the break-in procedure (and maybe after as well). Is it OK? Thanks
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  #124  
Old August 4th 2011, 07:50
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At least 1200 ppm ZDDP in your oil at all times. Around 1800 ppm for break-in.
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  #125  
Old August 5th 2011, 14:26
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Quote:
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At least 1200 ppm ZDDP in your oil at all times. Around 1800 ppm for break-in.
Perfect, thanks
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  #126  
Old January 16th 2012, 11:42
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Quote:
Originally Posted by NO_H2O View Post
At least 1200 ppm ZDDP in your oil at all times. Around 1800 ppm for break-in.
Thank you for the input guys, engine ran an other 2 hours (ZDDP added) and lifters seems OK (at least better).

Bad news that I've sold the car so engine should stay on the standard for a while. Will open a new topic for the newbie.

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After :-)
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