You need to run it out for the entire time. Running it up for 5 minutes at a time doesn't cut the mustard.
You want to make sure your engine is ready to run when you start it up. The last thing you want to do is kill that investment by not following directions.Īgain, use a break-in oil which contains zinc (or use an additive), then run your engine up to 2000-2500 RPM for approximately 20 minutes in one shot. You just installed a chunk of change in your engine (whether rebuilt engine or just replacing the camshaft/lifters). The inner valve springs can now be replaced.Įngine Builder magazine also states this in their Flat Tappet Camshaft Break-in Procedure. COMP Cams® Oil, as well as the Break-In Oil Additive will assist with ring seal during the early break-in period of your engine. Refill crank case with COMP Cams Part #1594 (10W30) or #1595 (15W50) Muscle Car & Street Rod Oil or other quality name brand oil with the addition of COMP Cams® Part #159 Break-In Oil Additive. After the 30 minute break-in period, change the oil and filter to be sureĪll contaminants from the initial break-in period are removed from the engine. The engine RPM may be varied periodically from 2000 to 2500 to direct oil splash to different areas of the camshaft.
Slower engine speeds will not supply the camshaft with an adequate amount of oil for the break-in period. As soon as the engine fires, bring the RPM up to 2000 to 2500 during the first 30 minutes of operation. This allows the lifters to establish rotation and develop a good wear pattern. Other non-synthetic, heavy-duty motor oil along with COMP Cams® Part #159 Break-In Oil Additive may be used. COMP Cams® recommends using Part #1590 (10W30) or #1591 (15W50) Engine Break-In Oil. Also, we do not recommend the use of synthetic motor oils during the break-in process. Important: On hydraulic flat tappet cams that require dual valve springs, the inner spring must be removed during break-in. If you'd like something other than opinion, here is what Comp Cams has to say about it for their flat tappet cams (most every other cam manufacturer is going to say the same): After the cam break-in, then the initial oil change, then you can use synthetic oil in your engine. You need oil which has zinc in it so you don't wipe your cam lobes. No, synthetic oil should not be used to break in flat tappet cams.
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