DBR Pistons
At DBR, we have spent the last 5 years working diligently with a team of brilliant engineers at Wiseco developing a quality piston we race and are now proud to share with you. These are world championship quality parts no longer hidden in our own private stash. We have made over 1000 dyno pulls and won 4 world championships using these pistons with zero…I mean zero problems whatsoever. Prior to this we went through pistons like gasoline. A new DBR piston will stand up to 700 plus hp nitrous passes.
Top guided, side pinned, 1 ring, 2 rings are all areas we have tested. Currently we are sticking with Wiseco’s side pin, as it has proven perfect as they claim. We lose ring seal and have more significant leak down when top pinned. We also have deduced that properly shaped sleeves with symmetric ports built on the CNC eliminate side loading of the locating pin. During these 5 years of testing we also have found that the standard Keystone ring with hard anodized ring lands are far superior to single or dual flat thin rings. The 2-ring keystone design seems to help reduce piston slap when cold. It also helps to transfer the high piston temps through the 2 rings into the block out to the cooling water and back to the lake. Basically, there is less chance of detonation. A properly mapped engine can run wide open for long duty cycles. Again correct fuel mapping and ignition timing are vital to piston life. We have seen more than 500+ horsepower to 10,000 rpm using this same piston now available.
The pistons in our 2-stroke outboard engines are the lifeblood of a successful engine build. Proper alloy (not a 4-stroke alloy), cam profiles, crown shape, ring design and tension, anodizing and skirt coating, and structural integrity are vital components of a good design. How many other 2-strokes do you leave WFO for minutes at a time? Maybe some garden equipment. Fact of the matter is that a 2-stroke piston goes through hell in a high rpm engine. A proper design makes life much easier. We have all seized a few too many.
Piston Coatings
All of our pistons come with Wiseco’s new secret skirt coating. We have seen major benefits from this process. Along with Wiseco, we have tested numerous "slippery" skirt coatings. This new process contains Zilan. This is the only slippery coating we have seen make a difference in horsepower.
Ceramic Coatings
There can be gains here but without proper dyno testing and remapping we suggest staying and use what comes standard on the crown. The hard anodize helps to deflect some temperature from the piston. Ceramics change tuning and it is normal to see crazy high pyro temps that challenge a qualified tuner. Please call if you are interested in ceramics.
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Top guided, side pinned, 1 ring, 2 rings are all areas we have tested. Currently we are sticking with Wiseco’s side pin, as it has proven perfect as they claim. We lose ring seal and have more significant leak down when top pinned. We also have deduced that properly shaped sleeves with symmetric ports built on the CNC eliminate side loading of the locating pin. During these 5 years of testing we also have found that the standard Keystone ring with hard anodized ring lands are far superior to single or dual flat thin rings. The 2-ring keystone design seems to help reduce piston slap when cold. It also helps to transfer the high piston temps through the 2 rings into the block out to the cooling water and back to the lake. Basically, there is less chance of detonation. A properly mapped engine can run wide open for long duty cycles. Again correct fuel mapping and ignition timing are vital to piston life. We have seen more than 500+ horsepower to 10,000 rpm using this same piston now available.
The pistons in our 2-stroke outboard engines are the lifeblood of a successful engine build. Proper alloy (not a 4-stroke alloy), cam profiles, crown shape, ring design and tension, anodizing and skirt coating, and structural integrity are vital components of a good design. How many other 2-strokes do you leave WFO for minutes at a time? Maybe some garden equipment. Fact of the matter is that a 2-stroke piston goes through hell in a high rpm engine. A proper design makes life much easier. We have all seized a few too many.
Piston Coatings
All of our pistons come with Wiseco’s new secret skirt coating. We have seen major benefits from this process. Along with Wiseco, we have tested numerous "slippery" skirt coatings. This new process contains Zilan. This is the only slippery coating we have seen make a difference in horsepower.
Ceramic Coatings
There can be gains here but without proper dyno testing and remapping we suggest staying and use what comes standard on the crown. The hard anodize helps to deflect some temperature from the piston. Ceramics change tuning and it is normal to see crazy high pyro temps that challenge a qualified tuner. Please call if you are interested in ceramics.
Back To Technical 101
