You won’t see a lot of spinning rotors or candy apple spray painted rotaries on the site. I will leave the marketing to others. At CPR we are into one thing… delivering positive outcomes for our rotary powered customers.

While the 575 SAE top tick horsepower level at 25/26 psi boost is nice, notice the huge amount of power (403) at 5000 rpm and 448 at 5500. Midrange horsepower wins races and is really fun to drive. a combnation of CPR's ports and turbo manifold design delivers a V-8 like power curve. In a third Gen, think street rocket.

Yes, we build rotaries, but our business is delivering  positive outcomes.

You are probably visiting because you have a sick rotary, and you need a healthy replacement.

Job One is to determine exactly why your motor failed. Job two is to fix the problem, whether it be a system, tune or motor  issue. Job Three is to deliver to you a superb motor.

Please permit me to state the obvious;  it does no good to build a super motor for you without solving the issue that damaged your current motor.

The high horsepower turbo’d rotary is reliable if it is properly built, fixtured and tuned. All CPR motors are family and CPR commits to being a partner with you on the journey.

That means, in simple terms, your calls are welcomed after delivery. It means we will provide you with a Power FC Map and advice relating to your systems/setup and any other tech help that might be relevant. 

At CPR we don’t just sell rotaries, we endeavor to provide positive outcomes. Think partnership.

Everything else is just detail. 


Rotaries started for me in late 1982 with the purchase of Roger Mandeville's 1979 & 1981 IMSA RS season-winning RX3SP. IMSA Mazda 
rotary victories in RS (55 car fields), GTU and GTO launched Mazda in the US car market. Roger and I converted the RX3 to SCCA GT3 specs.
During the following 6 seasons I rode my rotary powered RX3 to 27 National wins including the June Sprints and a second at SCCA's Runoffs
at Road Atlanta. i held track records at Road America, Mid-Ohio, Indianapolis Raceway Park, Brainerd International and Blackhawk Farms. 

Roger's RS car was arguably one of the most significant Mazdas ever built and it is sad that after I raced it for 6 seasons the only original items on the car were the roof and front windshield... but during the 6 years of re-engineering and inspite of SCCA lowering the restrictor plate from 50 to 38 MMs laptimes dropped, wins accrued and that's what it is all about. This picture was taken at the last race before retirement of the car at Road America and shows it in it's most advanced form and running under the lap record. Most of the GT1 and GT2 field, as well as GT3, were looking at it's tail lights.

Since going rotary in 1983 I have always owned RX7s. My FD is being re-configured (lots of neat new stuff) with the objective of running over 200 mph at the October 2016 Texas Standing Mile.

CPR would be delighted to build an identical engine for you. 

Sure, but just one more time... there are really 3 jobs that need to be done.

1. Identify the problem that injured your motor
2. Build a motor
3. Properly refixture and tune the new motor

If any of these three challenges are not successfully met the outcome is failure. As mentioned, CPR motors are family. WE want them all to succeed and this will only happen if the problem is diagnosed, an excellent motor is built and that motor has proper support and tuning.

To that end we will want to talk to you at length as to your setup and the circumstances of your problem. Taking that information we will do forensics on your motor. A combination of your input and the motor's condition will generate the answers we need to be successful going forward. 

CPR builds only one rotary (13B-REW) and builds it in only one state of tune: 

well mannered around town and producing 21 mpg highway.

a street rocket capable of generating 448 SAE rwhp at 5500 rpm with the proper turbo

600 SAE rwhp at 29 psi with an 80 lb/min turbo

We don't recommend using all your 600 rwhp on the street... but you could.

CPR builds all motors to the same spec, the right spec. CPR delivers one set of ports, the right ports. (over 20 degrees additional duration and an undisclosed overlap.) Racers don't share all the details with the competition. 

Here’s the process:

CPR works with you and and the freight company... 

CPR receives your motor, disassembles and specs it, generally the same day. We will email you a 6 page spec sheet with all dimensions including gram weight of your rotors etc. At that time, we will list needed replacement parts.

CPR does not subscribe to the everything new policy. We do not consider all used parts to be junk. Parts either are, or are not, serviceable based on wear. It is no accident that the middle name of our enterprise is “Precision.”

We know what works and what doesn’t work used and it is not necessarily what you read in the FSM.

Certain things do always need to be new. Fortunately, they are generally fairly inexpensive.

Which leads us to pricing. 

Ideally we want to be on the same side of the table as you. All parts are transferred to you at our cost. That way you know if we have to buy something it is being acquired only for the right reasons.

CPR charges $1950 for labor, $300 for (optional) upgraded cleaning, and approximately $800 for parts priced at CPR cost. Should your core be usable the motor should cost approximately  $2700 excluding the optional cleaning and freight.

There’s cleaning and cleaning. Should you chose the upgrade, your motor will do an initial industrial washer trip and then will be soda blasted and garnet blasted and back thru the washer. All 3 irons, two rotor housings, two rotors, the front cover, water pump assembly. When complete with new front cover bolts your motor should look (as well as run) better than new. The cleaning process is performed by an unaffiliated party and transferred to you at CPR's cost. 

Should your rotor apex seal grooves be worn we will custom fit the Goopy 2 mm .004 oversized seal so as to end up with a tight .0015 clearance.. Tight apex seal and side seal clearance creates great compression and power.

We do have an inventory of excellent condition used parts which offers an attractive option for you should you need to replace a non serviceable component.

Payment sequence:

We will arrange shipping for you and convey our significant discount. You Paypal CPR the shipping.

CPR disassembles and specs your motor normally the day it arrives. We quote you a price for parts… generally around $800, list over $1000
You paypal CPR the (approx) $800. We order the parts, do the ports, have your major pieces cleaned, assemble your motor and you then pay  the $1950 plus return freight and we ship your motor. 

The process generally takes approx 2.5 weeks. You receive a 6 page spec sheet as to your motor’s condition on disassembly. You receive another 6 page spec sheet detailing completed specifications. We guarantee the motor is to stated spec. 

As previously mentioned, your motor is “family.” that means we are involved with start-up and tuning and are available for advice. CPR will be interested in your systems and tune. 

Your CPR motor will produce over 100 psi oil pressure on startup, 82-85 psi at 3400 on the highway, 80 psi at 8000 rpm on the dyno, and approximately 47 psi at idle. Idle is approx 1000 RPM. Vacuum at idle around 15 inches, 350 to 400 MM. With a proper turbo and tuning the motor will make 400+ SAE rwhp at 5500 rpm and at 20 psi with mid range sized turbo will make 500 SAE at 20 psi. Add a larger turbo and you will be looking at 600 SAE. Any more than 600 and you will be past the configuration that we build. 

All motors will have the External Oil Pump removed as well as the coolant input and output ports to the throttle body plugged. Additional oil galley mods are also added to all CPR motors.

A 500 rwhp rotary makes over 6 hp per cubic inch. This state of tune creates huge Combustion Chamber Pressure (CCP). Unless you run some sort of Auxiliary Injection (water and/or alcohol) your beautifully built rotary will grenade in short order. Please read my AI thread for further info. 


information relative to calculating the proper amount of fuel(s) for your CPR rotary can be found at the following link:


Built and fixtured correctly, nothing can match the rotary given it’s displacement.

Do it right and the rotary is reliable. I pulled my 497 SAE  rwhp rotary out of my car after 4 years of service just to inspect it. I found it to be in perfect condition… some new seals/springs and it is ready to go.

We at CPR welcome the opportunity to solve your rotary problems


Howard Coleman
262-692-3093 Wisconsin