Engine break-in after initial run Options

[Cevan]

I've searched here and at other sites for engine break-in procedures. I've done the cam break-in and the motor is now in the car with fresh 20-50 Brad Penn and a new oil filter. Valves have been checked. Fingers crossed.

From what I've gathered, most recommend warming up the engine and then doing a series of fairly hard accelerations under load followed by de-accelerations to help seat the rings, and in between, no sustained rpm driving. Some go as far as recommending you drive it like you stole it and others (Aircooled.net) say drive it easy for the first 100 miles.

I also tried to determine when best to change the oil. Do I need to change it at 100 miles and then again at 500 miles (and then every 3000 miles thereafter)?

[detoxcowboy]

From what I've gathered, most recommend warming up the engine and then doing a series of fairly hard accelerations under load followed by de-accelerations to help seat the rings, and in between, no sustained rpm driving. Some go as far as recommending you drive it like you stole it and others (Aircooled.net)

those 2 above are the same and sounds right, old thoery was take it easy which is now debatable with the hard driving break in..

full load drive it like you stole it! to seat the rings..

i bought my 914 w/ 8,000 miles on a rebuild, the p.o. babied the car, actually buying it was like taking a child from his mother.

when I opened it up the cylinders walls showed that the rings nevr seated, I could still see the original honing crosshatch..

THAT IS WHY I LEAN TO THE DRIVE IT HARD FOR 20 MINUTES