I am a strong believer in micheals method above, running an engine in on the dyno is most probably the best way to do it.
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I have mentioned this before in some other threads.
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This is my method from researching how people who build them every day do it.
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Something to note is that bearings and cams dont bed in, the bearings are only there to create oil clearances, you crank and rods run on the oil, not on the metal of the bearing, if they did, it wouldnt live very long!
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The cam journals are machined in this way also, oil pressure is what keeps these parts cool and creates a fine high pressire film for everything to run on.
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What you are bedding in is the rings.
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And for a good long life healthy engine the most important running is the first 50 miles.
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Let the car fast idle for 15-20 minutes on cheap mineral oil, change oil and filter.
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Drive the car and make sure you give it some gas, up to 10psi of boost on light controller hrottle to about 4000rpm, on a na engine you have to make sure you give it some load.
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The rings are what your bedding in, and to do this you need to force them into the cylinder walls, cylinder pressure does this, but if you dont create any it wont be aswell.
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I like the method of accelerating to 4000rpm in say 3rd gear, and then letting the engine break down to say 2000rpm, then acclerate again, different gears for varying rpms.
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Basically lots of varied driving, plenty of gear changes, not contnuous rpm.
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i then after 50 miles changed the engine oil and filter again.
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What your trying to do is throw lots of different things at the rings, technically its all to do with the geometry of the rings and mating them to the cylinders.
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I dont know that much indepth, I just know that if you want a healthy compression and no oil consumption this is how you do it.
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After 50 miles, i took it up to 5000rpm, similar driving style, then 7000rpm after 100 miles.
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Then it drove to the dyno and finished bedding in producing 360rwhp before 500 miles was reached, the again peaking 425rwhp just under 1000miles.
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I like frequent oil changes, you dont need to many, but for the cost of cheap oil and filters against your engine costs, its not worth not changing.
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13k miles later, 168psi on all cylinders and just been on the dyno and going back next week,
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Best thing car salesmen do is thrash your new car before you buy it lol
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Each person has their own way and opinions, all i can say is that this definitly worked for me.
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Good luck
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Graeme