Welcome to Defined Autoworks!
What we are-
Home of the most powerful naturally aspirated 4-rotor in the world currently at 661 rear wheel horsepower and 385 rear wheel torque- documented.
We are a modest facility located in Pataskala Ohio, which has served hundreds of customers across 20 years of business.
Looking for the most wild rotary vehicle anyone has ever seen? We are building replicas of the gorgeous 1992 Mazda GTP prototype car, the Rx792P! 
The only shop in the United States actively racing and developing a 4-rotor powered Rx7. 
Our talents range from standard engine rebuilds, complete engine builds, service, modifications and full scope builds with RX series vehicles. 

Who are we-
Logan Carswell is the owner/ founder and creator of Defined Autoworks established in 2006. His father, Ken Carswell, was one of the few factory trained technicians on the then-new mazda rotary engine. After working at a Mazda dealership for many years, Ken started his own Mazda shop in 1979. Logan grew up around these rotary engines his entire life. In 1996 Logan began getting interested in the performance modifications of Rx7's, which led to a path filled with unique builds from that point forward. Logan was one of the 1st in the states to do a 3-rotor all-motor build, in 2004. Producing a respectable 340 rear wheel horsepower it showed that all-motor had potential.  He was also one of the first in the United States who custom built and installed a 4-rotor in 2012 which featured triple spark plugs, 5 main bearings, aluminum side housings, drysump lubrication and full peripheral port configuration.












































What we are doing-
With a heavy workload we are constantly working long hours to satisfy customer demand. After hours however Defined Autoworks actively races in NASA, SCCA and Gridlife events. With a passion for not only building the wildest creations, Logan also loves to race. Defined Autoworks has been racing a 4-rotor powered Rx7 for over 15 years, proving all the technology developed. All this information gained is passed onto our customer projects to improve every aspect of rotary engine building.  

Records achieved-
Pushing boundaries need to be backed up with actual results. Lap times can't be faked, and for this reason Defined Autoworks set out to prove the rotary engine is still relevant. Logan and his 4-rotor powered Rx7 beat the NASA TT1 record at Mid-Ohio by over 2 seconds. Personal best lap time at Mid-ohio is a 1:27.8 on pro-course and 1:28.9 club course configuration. Both these lap times are at the spec TT1 power to weight which is 500 rear wheel horsepower. Recently in 2026 we have tried racing unrestricted with 660 rwhp on a test session, which proved to be a large step faster. Looking forward to 2027 to see what the Rx7 can do. 

Horsepower like no other-
Defined Autoworks has worked extensively with turbocharged and naturally aspirated rotary engines for years for customers. Logan took a interest in the naturally aspirated engines personally due to the hardest challenge. There is no boost knob to just gain more horsepower.  This led to testing.... lots and lots of testing, on 2, 3 and eventually 4 rotor engines.  All this effort has produced and held some of the highest documented horsepower in the world. Here is the current achievements and date they were established-

13b-RE streetport, naturally aspirated 93 octane- 230 rear wheel horsepower (274hp engine). Year 2008

20b Streetport w/ semi p-port, naturally aspirated 93 octane- 475 rear wheel horsepower (565hp engine) . Year 2012

26b Full peripheral port, naturally aspirated E85- 661 rear wheel horsepower (780hp engine power). Year 2023 (700rwhp maybe coming soon!)