ok i did a little bit of serching and did find some stuff but not others..ok this is what i know, if u get a rebuilt, they take ur core apart and basically redo everything that is needed and extra stuff u want( porting, 3mm seals ect.). now when u get a reman its a completely different core. am i right? so u dont know whats what in it. all u know is that it runs and everything needed was replaced on it. ok im not sure if im right there, but if i am who keeps ur old core?? please dont flame me ive spent hours in this forum and ive learned so much, from knowing only that the engine was a rotory to knowing.. well i cant post it, it would take all night. well thanks in advance. u guys have been very helpfull.

 

bump. please help me with this, its the last stupid question for a while. i promise

 

rebuilt is using all your satisfactory engine parts in a build
reman tends to be a core swap... i.e. you get someone's rebuilt old core with new good bits, someone else gets the one your sent in.

difference, bugger all.

 

I believe you get charged a core charge fee when you buy a reman. So lets sayy ou get charged an extra $500 ontop of the price of the reman, when you send in your old engine core they will send you back yur $500. If they didnt get your old engine they would not have any to rebuild and turn into remens

Edit: I guess I was too slow he ansered it for you

 

Correct. With a reman, you buy an engine that is rebuilt and ready to go. You send them your engine as a core.

Yes, this remains an issue. Remans are not made by the same people that built in the original engines in Hiroshima - in some cases people have immediately torn down a reman and found used parts in marginal or unacceptable condition. But this is still the case with getting your core engine rebuilt too.

One advantage of Mazda remans is they usually come with many new parts, and the total price is cheaper than paying a shop to rebuild your core with similar new parts. So a reman is a nice chunk of good/new parts for the dollar. If you're lucky you'll get all new parts in the key areas. Generally the quality is good. If you buy it from Ray at malloy, he sometimes can give some info on the trends he sees in the remans, or that the remans have a bunch of new parts. It's not a guarantee, but it helps.

One option for a reman is to buy it and have a shop immediately tear it down for inspection. To pay a shop to tear it down just for inspection sake is kinda expensive, and is usually done in combination with machining for 3mm seals and/or porting.

It's a core - if you don't send it in, you don't get that $500 back. It's your option, I believe.

Dave

 

So A Rebuild Is More Expensive Put Better? Which One Is Better, If Ur Not Porting Or Nothin Just To Keep The Core Stock....and R There Any Good Shops In Cali Or Even Better South Cali. I Think Theres One In Gardena. Am I Right, And If I Am Is It A Good Shop? Thanks Very Much Guys

 

The quality of a rebuild or reman is measured in longevity. The key to this is building the engine without mistakes and with components that are 'good' enough to not compromise the lifespan of the engine. The quality of a rebuild is different from performance - so before buying any fancy coatings, ports, upgrades, etc - you should know if this is designed to improve longevity or performance. Most rebuilds are not done with maximum longevity as the goal - every owner has their own balance of cost, performance, and longevity.

1) A rebuild with all new wearing components (housings, side housings, rotors) is "Best". It will last the longest most consistently. But it's expensive due to all the new parts. A rebuild by a good rebuilder can be nearly as long lasting while using more used parts. IMO, the key is using a rebuilder who inspects the used parts well and that you both have an understanding of how worn the used parts can be - used parts can keep the costs down substantially while still giving you great performance and value. The other major feature of a rebuilder is that they can do performance mods like porting, seal modifications, etc. So a rebuilder is the most flexible solution - they can be cheaper than a reman (e.g. RotaryResurrection specializes in this) or much more expensive. It all depends on what quality level you require and what extras you have put in it.

2) A reman is a crate motor. They are all exactly stock, and work very well at stock to moderately modified performance levels. They are rebuilt to Mazda factory specifications using a mix of new and used parts, and have a flat price - so you may end up with a motor with many new parts that would have been much more expensive if the parts were bought separately. It's ready to install - just remove all the engine accessories from yours, transfer it to the reman, and drop it in. I think it usually comes with a warranty of some sort that is valid for unmodified use. It doesn't take a super-specialized rotary shop to do this - in fact hooking up the rats nest is usually the only challenge. The downside to a reman is that if the rebuilder was sloppy and used a component that isn't to spec, you won't know unless it has problems, and some quality problems won't appear within the warranty period. So a reman is fast, simple, a good value, and generally good quality.

You're in SoCal. Check the West regional forum stickies and you'll find plenty of options. Don't ask about it here anymore.

Dave

 

thanks dgeesaman u have answered all me questions again thank u very mucho. till the next time