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Old 09-03-2011, 09:53 AM
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Engine break in w/ roller cam?

I just finished building a 383 stroker for my van. I am waiting on the headers to arrive to get this thing fired up. My question is... what is the proper way to break in a new build? I know you break in a motor with a flat tappet cam by reving it over 2000rpm for 20min or so but that is mainly to break in the cam right? If I am using a roller cam is the break in the same? Someone told me that I just need to do a bunch of hard accelerations and decelerations to break in the rings? What is right?
Thanks,
Chuck

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Old 09-03-2011, 10:14 AM
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Moly rings? Those break in pretty fast and right, no cam break in for a roller. I like to but a few easy to moderate miles on a new engine and then change the oil and check it for particles. If it looks ok, I generally drive it like I stole it....
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Old 09-04-2011, 11:34 AM
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I am almost certain they are moly rings. If so what is the recommended method of breaking them in.
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Old 09-04-2011, 01:06 PM
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Speed Pro

If Speed Pro rings are installed correctly, they will seat in 15 minutes idling at 700 RPM. I am referring to Speed Pro 5/64" plasma moly top, 5/64" ductile iron second and SS oil rings and Speed Pro forged pistons with .0035" skirt clearance. I never use 1/16" rings on forged racing pistons because the cylinder wall clearances on those type pistons is as little as .006" and the break in procedure is different. .

Check the dipstick in bright sunlight for glitter after seating the rings. If glitter is present in the oil on the dipstick, the rod or main bearings do not have enough oil clearance and the bearings are wiping out.

As written before, do not hold the engine at a constant RPM for more than 15 minutes for the first 100 miles. Stop and go traffic is a good way to break in an engine. The old school saying is: "Break in the engine like you will drive it". That is pretty good advice but it depends on if you are using forged high performance pistons designed for the street or forged racing pistons designed for competition.

Last edited by MouseFink; 09-04-2011 at 01:14 PM.
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Old 09-04-2011, 03:32 PM
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I have KB RS861M +.030 rings according to Scat. I can't find any info on it other than the "M" should stand for Moly.

My pistons are KB 9926FHR+.030 -18cc dish. Guess is it is a street based piston.
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