Originally Posted by Aaron Cake

For $12K US, you might be able to get the block built.

Kiwi RE sells their 4 rotor kit for $9,500 NZD, which is about $7,039.75 US.

You are still going to need:
-4 rotors (figure about $50 each): $200
-4 rotor housings (about $400 each from Mazda, plus machine work to peripheral port at an additional $150): $2200
-Apex seals, o-rings, all other internal seals for 4 rotors: ~$2500
-Misc. build supplies: $100

So for $12039.00 you could probably have a 4 rotor short block.

Of course it will be useless because you still need to:
-Fabricate the dry sump oil pan (less then $100 if you can do it yourself)
-Set up the oil pump and tank ($2000 worth of parts)
-Mount the engine ($100 or so worth of metal and misc)
-Build a cooling system ($300-$600 aftermarket rad, $100 in plumbing for hard piping)
-Install oil coolers (2 cheap used FC coolers, $200-$300 worth of stainless line)
-Install aftermarket flywheel and clutch ($600)

Now the engine is in the car. It won't do anything because there is no way to control it nor is there an intake and exhaust:

-Standalone to run 8 injectors and 8 ignition channels ($2000)
-Large aftermarket fuel pump, injectors, line, regulator ($2500)
-Custom intake manifold with 4 ITBs, 8 injector bungs, sensors, airbox, etc. ($Not even worth it if someone else is being paid to do it...price varies wildly if you do it yourself depending on what you choose but figure $500-$3000)
-Custom medium length 4 into 2 header ($300 to do it yourself, $1000 for a shop to fab it)
-Catback with resonators, dual ($300-$400 if you do it yourself, $600-$800 for a shop)

Then there is tuning and debugging time, etc. And I didn't even mention anything about converting to the TII transmission.

If you have to pay a shop to do the work, you're looking at a $60,000 project. If you can do it yourself, a lot of those costs can be cut because you can choose parts based on price, availability and such. Labor being the largest cost then becomes "your time".

I'll be doing all the work myself but then I've also decided to go for some extras as well. For example, your $12K would almost cover the RB aluminum "irons" I am planning to run. Hence my budget for the project is "whatever it costs".

Originally Posted by Aaron Cake

Kiwi RE sells their 4 rotor kit for $9,500 NZD, which is about $7,039.75 US.

Originally Posted by Worm Burner

It's not actually Kiwi Re's kit. It's actually made by Jeff Bruce at Precision Engineering in NZ. Kiwi Re just put their markup on it as a distributor