Does a rebuilt engine mean that the engine is as good as new?

not exactly. it menas that anytihng which wears out or has worn out, has been replaced/.rebuilt. however, there could be fatigue which cannot be seen and which theoretically could cause catstrofic failuer eventually. however, this is pretty unlikely.

Rebuilt engines, frequently called overhauled engines, have been dismantled, inspected, cleaned, and their parts are replaced or repaired to update them to current manufacturing specifications. Rebuilding an engine, while labor intensive, costs less than replacing your entire vehicle or engine. Due to the unique process, some parts of rebuilt engines might be as old as the original, slightly used, or brand new, but many manufacturers will offer a warranty anyway. Choosing a rebuilt engine can extend the life of your car and might be a cost-effective option if you know you have serious engine trouble.

Technically, rebuilt engines are different from overhauled engines. With rebuilt, or remanufactured engines, a mechanic will either save or fix parts based on the amount of wear or damage. The original manufacturer of your engine, whether from an automobile or boat, is the only one authorized to remanufacture the engine. Much specialized machining is done to ensure that every part works well. However, overhauled engines contain only a few replaced parts, at full cost, and rarely involve machining old parts. This can be less effective in extending the life of the vehicle.

Some of the machining done in rebuilt engines includes reforming the piston-cylinder system. The cylinder channels are re-bored and the pistons are fitted to match the larger cylinders. All bearings are smoothed and lubricated. The crankshaft or camshaft might be reground, heads resurfaced, and connecting rods machined and precisely gauged. Other, less expensive parts, could be replaced, such as the timing belt, gaskets, and belts.

Since rebuilt engines have different parts with different operating histories, they are not guaranteed to last as long as a new engine. A part that was fine when the engine was evaluated during the remanufacturing process may malfunction after the engine has been re-installed. Yet, the advantage remains that it has been thoroughly inspected. If your vehicle stopped working for one reason, rebuilding the engine may lead to discovering, and preventing, other things that would have otherwise gone wrong.

Rebuilding A Engine

It's been my experience that a "rebuilt engine" has different meanings to different people.

The truth is, if an engine is thoroughly and properly rebuilt, it may well be better than a new engine because the block is seasoned (meaning it's integrity has been tested and proved strong).

New rings and bearings, for instance, does not make an engine "rebuilt."

in a sense yes, typically a rebuilt engine means the engine block itself has been rebuilt which that is the engine, however that does not mean that the transmission alternator starter ect. is new. everything else that is not part of the engine block is not rebuilt. so you might end up going through transmissions before you ever have to worry about blowing a head gasget or throwing a rod.

It depends on who rebuilt it. Your basic parts store long block is probably almost as good as new, but not quite. A Jasper is probably better than new because they study the failures on the cores they get and make improvements. That's why one brand might be $1500 and another $3000.

New engines can vary greatly in quality to, so it's kinda hard to compare.

Done properly, a rebuilt engine can actually be better than a brand new engine. It's all a matter of how much money that you wish to invest in it.

Not as good as new, but a lot better than how it was depending on who rebuilt it. You also need to take into consideration how old all the other parts are around the engine, like the transmission or even the rear end.

Often it depends on who rebuild the motor, how far gone it was before rebuild and, what was replaced. Sometime rebuilt motor can wear out in a few months due to something like an alignment issue.

it depends on the engine, i have to assume you know how engines work, but when they go to bore out the piston cylinder they make the walls of the block weaker ( unless the engine is sleeved , or has extra thickness between cylinders ) but... the rest of the car is old , like suspension , transmission, rear end, brake lines , etc.

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It means Peter, just back away from the car, back away. Unless they have documented paper work from a professional auto shop, it could mean anything.