smurf3642

I know somethings about cars and how they run, but I don't understand any at why you should vary the engine's RPM speed at first breaking it in...

Can anyone explain this in lamens terms please?
:oops:

tcwannab

your supposed to vary speeds to make sure seals and rings seat well before you go whippn around, thats all i know not sure on technical things but im sure that website that tells u how things work would have the answer

bB2NER

Because while the engine is running the loads on the parts that touch vary depending on the speed. The higher the RPM the greater the load. If it was an engine that ran at a constant RPM all the time like say a lawn mower or generator for the most part it would not be so critical. By varying the RPM it evens out the wear patterns. correct me if I'm wrong

tcwannab

so wouldn't it be good to have spirited acceleration every so often? not hard just firm... like a good smack when ya tap dat ___ sorry to the older mature crowd, gettn tired and nutty

bB2NER

YES, exactly, just keep it under 4,000 RPMs until 1,000 miles. Then have the first oil change done to remove the metal shaving from the break-in. :o