How to break in a engine?
#3
RE: How to break in a engine?
All I do is fire it up and let it come up to temp, then change the oil. After that I drive it around for a few miles, again letting it come up to temp. This is all time to check for leaks and such, drive at different rpms etc. After that I let it cool down and repeat. The rings will seat after a couple of heat cycles, the bearings as well. Change th eoil and your ready to go. I have never broke an engine in for 5000 miles, that seems just silly to me. Everyone beleives different things when it comes to this subject. I feel the engine is ready to go after a few heat cycles and will be fine IF it was machined and assembled correctly, if it was not, no amount of prolonged break in will help it.
#4
RE: How to break in a engine?
With full roller assemblies a full break-in is not as important as it was on the mechanical tappet style engines. I agree with JD, as long as you put it through a few heat cycles it should be fine.
#5
RE: How to break in a engine?
They're right about a few heat cycles and you're ready to go, but you won't be seeing all your cars ponies until it's got a few more miles on it. I meant you'd probably be into your prime around 5000 miles.
#7
RE: How to break in a engine?
As JD mentioned, it is most important that the engine be machined and assembled correctly. On a roller cam engine, go through several heath cycles, change the oil & filter and it should be ready to go. On a flat lifter cam, the usual procedure is to run the engine at around 2000-2500 RPM for 1/2 an hour to get the lifters and the cam lobes mated. Then do the same as for the roller lifter engine. It is a good practice not to run the engine at a constant speed for the first 500 or so miles in order to better lubricate the rings till they are seated. Allowing the engine to coast down from a higher speed creates high vacuum which draws a little extra oil through the valve guides and helps to lubricates the top of the cylinders.
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