Break-in - Team Camaro Tech
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post #1 of 5 (permalink) Old Oct 16th, 18, 07:42 PM Thread Starter
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Break-in

Am flashing up my rebuilt 302 this weekend and would like to know how long I should run it before the new ceramic coated headers can safely be installed.
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post #2 of 5 (permalink) Old Oct 16th, 18, 07:45 PM
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Darin
 
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After you run in your cam you should be good to go.

1968 Butternut Coupe,
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post #3 of 5 (permalink) Old Oct 18th, 18, 03:17 PM
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alex
 
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Re: Break-in

Brand new engine with a flat tappet cam.Break-in the camphor 25 minutes . Two thousand R P M for the first twelve minutes then vary the RP M from 2000 to 3000 up and down . change oil and filter. next take it out on the highway bring it up to 65 70 mph then let off coast back down to about 30 mph then bury the pedal to the floor back up to 65 / 70 mph. Do this about 6 to 8 times and your rings will be seated . this of course is providing the proper cyl wall finish and the right ring for it. change your oil again at 500 miles then after that follow your usual oil change routine . use Valvoline v r 1 silver bottle plenty of zddp for the cam and lifters and a Napa gold filter its a wix oil filter and your good to go hope this helps maybe a bit old school but has not failed me yet . Retired Machinist . Alex
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post #4 of 5 (permalink) Old Oct 18th, 18, 04:31 PM
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Mark
 
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Re: Break-in

If your cyl walls were finished with a plateau finish then your rings will be seated immediately after start up.

Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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post #5 of 5 (permalink) Old Oct 19th, 18, 03:48 PM
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Rufas
 
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Re: Break-in

The main reason for running the engine above 2,500 rpm's or so for a half hour was to help lubricate the flat tappet cam and lifters with oil thrown off rotating parts like the crankshaft and rods. This helps ensure the cam and lifters have enough "splashed on" lube to mate in those components.

Roller cam engines don't need the same amount of time to break in the cam and lifters, they are happy with the oil mist lubrication that is always present in the crank case when the engine is running, and have virtually no sliding friction/force between the cam lobes and lifter faces, so they don't need the splashed oil for mating in.

Clarification on "splashed", yes, the oil is thrown off the points of origin, crankshaft, rods, etc, but, when it contacts the cam and lifters, it is virtually splashed onto those parts as a thrown off liquid, not a mist, although the mist is also present.
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