4106 Dyer Circle, Midland, Texas 79707, United States

(505) 716-7287

RMJ Machine Worx

Reproduction piston rings for small and vintage engines custom piston rings


Featured Products


Many of you knew Frank Bowman as the "Ring Master".  When we purchased the business to carry on the manufacturing of quality rings we needed a new name.  RMJ was decided on because Bjorn has now become Ring Master Junior.  He spent many months training and learning the techniques of making the same quality rings that Bowman rings were know for around the world.  

ordering information


-Gapped- We file the ring ends to a 0.001" gap.

-Ungapped - We leave the ring ends for the customer to file/fit to their satisfaction.

We are working on our online store to make ordering our rings an easier process.  If you have questions please email us at rmjmachineworx@gmail.com   See this link to our current ring list below.

Note there is a ONE week lead time.

We have many other rings available.  If you do not see your engine/model listed please contact us.  

Files coming soon.

About Us


Above and Beyond Quality


Quality at a fair honest price. Making a good ring is a Skill.

Making a fine ring is an Art!  We strive for perfection in an effort to continue what Frank Bowman started many years ago.

RMJ Machine Worx manufactures custom reproduction piston rings for small and vintage engines. 

(custom piston rings, bowman rings)


When you order from us, whether it's your first or tenth time, you become part of our family.  We hope that your purchase from us becomes the first of many. 


Our Promise

We promise to treat our customers with the honesty and respect they deserve. We pride ourselves on the quality of our workmanship and we want customers to feel satisfaction in choosing RMJ Machine Worx for their piston ring needs.  We hope you will be a part of our family for many years to come.

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RMJ Machine Worx

4106 Dyer Circle, Midland, Texas 79707, United States

(505) 716-7287