Rotary Engines
There have been a lot of changes in the past few years, and we are now being more selective about the engines projects that we take on.
Currently, we are only considering serious development projects.
We still get a lot of requests, and we have been sending all street engine inquiries to Arizona Rotary Rockets and all race engine inquiries to Mazdatrix.
As before, all engines are purpose built for your application. Because of this, an exact price can only be quoted once we determine all the modifications required for your project. Standard labor prices are shown at the bottom of the page.
Below are several pictures showing the engine assembly process. It is not meant to be a complete step by step, but it does show many of the procedures in detail. It also shows the attention to detail that goes into our preparation and assembly.
Go here for our description of a quality motor.
Go here for a short article describing the importance of flow testing.
Standard Labor Prices
Assembly - $1,500.00
This is for complete assembly including manifold, water pump, alternator, etc.
Clearance rotors, all seals, and bearings
Shot blast rotor housings and front cover.
Shot blast side housings before surfacing to remove all scale from water passages.
Re-paint side housings, water pump housing, and oil pan.
All new or re-plated visible external fasteners.
Block off or re-tap emissions/sensor passages.
All our engines look like brand new when completed.
Resurface Side Housings - $250.00
Housings are ground flat, and then lightly lapped to provide a minimum surface finish of 15rms measured across the grain.
We prefer grinding to lapping for 2 reasons.
1. Grinding insures that the opposing surfaces remain parallel. Lapping provides a flat surface, but does not have a mechanical reference to the opposing surface. Grinding involves mounting the housing to an electromagnet which is parallel to the grinding wheel travel so that dimensional accuracy is maintained.
2. A housing that is lapped mirror smooth will have little or no oil retention. This is clearly illustrated when applying assembly lube to a mirror finished housing. Rather than spreading evenly across the surface, the lube will bead up much like water on a freshly waxed car. Our process leaves some grain intact to hold oil on the surface, and the light finish lap flattens the top of the peaks insuring that the seals have a smooth finish to ride on. This approach is more time consuming, and so more expensive, but has proven to us to give the best housing and seal wear, along with a quick break in period.
Balancing - $375.00
Our balance process includes two separate steps. First, we balance each rotor on its own center, measure its center of mass relative to the gear, and match the weights of the two rotors. Once the rotors are balanced, the bob weights are made up, and the assembly is balanced. If you are using a lighweight flywheel with a separate counterbalance, the assembly is balanced minus the flywheel. The flywheel is then zero balanced on its own, and finally the pressure plate is added. This allows mixing and matching of parts in the future, as long as the counterbalances remain intact.
Porting
Porting can vary a great deal from one motor to the next, but the prices below should give you a rough idea.
"Street Porting" - $950 to $1,200.00
Bridge Porting - $1,500.00 to $2,000.00 Depending on application.
Peripheral Port Intake, and Port Exhaust - $2,500.00 (Requires Custom Intake Manifold)
Dyno Tune - Starting at $1000.00
Tuning on an engine dyno is the best money you can spend on a performance engine, and is mandatory for all engines that we build.