I know that after a while some people get the motor of their cars rebuilt. So, I was wondering if a rebuilt motor is just as reliable as a brand new motor. And, what exactly do they do when they rebuild a motor? Not that I am going to rebuild a motor any time soon, I just was curious.
2007-03-28 14:44:11 · 18 answers · asked by smart guy 4 in Cars & Transportation ➔ Maintenance & Repairs
Generally no. The rebuild companies only do the minimum. They are trying to make a profit at the end of the day. I am not saying the rebuilt engine is going to be bad but just not as good as new.
If you rebuild your own conscientiously, it will probably cost you more money and that doesn't factor in your time, so that alone tells you something about the factory rebuilds
2007-04-02 05:59:09 · answer #1 · answered by Poor one 6 · 0⤊ 1⤋
a re built motor is sometimes better than stock just because a good mechanic will go through everything like new crank,new rods,new pistons and new camshaft. line bore all the holes in the block and micro polish every journal.
so the engine is tighter than a new engine because the car makers put out 100s of engines a day and only check 1 of 10 maybe.
if you rebuild your engine don't get cheap parts and don't skimp out. get every part for the engine down to the last bolt. and recheck every thing as you go. that's is why if i want a rebuilt engine i do it myself not some shop were you cant see what they are doing to it. For the big stuff i have a machine shop do.
2007-04-05 12:29:49 · answer #2 · answered by jsn_ayers 4 · 0⤊ 0⤋
It totally depends upon the brand of motor. Why spend a grand at Nasty Auto (National Auto when you can buy a 100%new Chevrolet from GM for $2500. Specifically PN. 88958602 circle track 350 hp. 350 cu. with a full 24,000 mile 24 month GM factory warranty. Check it out in the 2007 GM High Performance Catalog at your Chevrolet dealer. Catalog part No 19170580 $5.00 buys one. Too many (384) pages if HP parts to mention.
With all due respect every part is brand new. Nothing rebuilt.
2007-03-28 15:49:21 · answer #3 · answered by Country Boy 7 · 1⤊ 0⤋
if done right, a rebuilt motor will last as long, if not longer, than what was in the car for the first time.
a factory rebuilt motor is built to the exact specifications that the motor was originally built with. they come with a good warranty (it's 3 years / 36,000 miles for Ford factory rebuilt motors). what they do to get it back to factory spec depends on what the engine needs to ge there...
what's good about rebuilding something for yourself is that you have total control over the quality and style of parts. you can use roller rockers, titanium valve seats, radical cams...only limited to how much you want to spend really.
2007-03-28 15:00:10 · answer #4 · answered by fast24vveedub 3 · 1⤊ 0⤋
a rebuilt motor can be as good, it depends on the machining equipment that the rebuild shop has. the closer the measurement and the flatter the deck the better. and what they do is dissasemble your engine, remove the pistons and crank, wash em off. machine the cylinder head and block. they will check to see if your cylinder walls are scored up. if so they will make the cylinders a little bigger and put new pistons in to match the new size. if the walls are ok then they willl probably just clean them up with a wierd looking brush and perhaps use your old pistons. its all a matter of what you want to spend. theyll probably give you a rebuilt head and use yours as a core, slap it all together for you and paint ugly spots with metal colored paint. thats it in a nutshell.
2007-04-04 21:30:29 · answer #5 · answered by Anonymous · 1⤊ 0⤋
Generally speaking an rebuilt as mentioned above can be better.... but if your paying a budjet company to build a budjet motor then that is what you'll get CHEAP... the cheapest parts and the cheapest way to install..
unless you go to a machine shop that does proformance engines or better than factory...stick to a factory rebuilt with it's warranty.
2007-04-04 11:48:29 · answer #6 · answered by Karl R 2 · 0⤊ 0⤋
In some cases a rebuilt motor can be better than a new motor . If you use the best possible parts and install them correctly . You can also upgrade parts to enhance performance .
2007-03-28 14:56:10 · answer #7 · answered by Rick 3 · 1⤊ 0⤋
It all depends on the rebuilder. Late model engines are built to very close, exacting tolerances. If the rebuilder has the equipment and expertise to maintain those tolerances, it should last as long as the original. All machined surfaces must be checked, and re-machined if any variance is found. All moving parts are replaced, except crankshaft, connecting rods, camshaft and valves, which are re-machined. Sometimes they need to be replaced if they are worn beyond repair.
2007-04-05 02:56:50 · answer #8 · answered by exjag 1 · 1⤊ 0⤋
yes a rebuilt motore are as good, but u want to get the block pressure tested for cracks and leaks, and make sure all ur components like cam, crank ,pistons,amdpiston rods and rockers, and rollers,pushrods, valves and rings are new and for the specific engine. i would get the heads and the intake tested. i would probably replace everything for the engine if u had the money to save a heartache
2007-04-04 17:31:55 · answer #9 · answered by Anonymous · 0⤊ 0⤋
yes depends on if you buy one from a good parts store or auto shop not from billy bobs back yard most of your parts you buy from the dealer are rebuilt (re-man) any way the best thing to look for is warranty if they don't offer a good warranty spend a little save a lot
2007-03-28 14:54:12 · answer #10 · answered by steven z 2 · 1⤊ 0⤋