overbore

1. not comparableengineeringSuch that the capacity of the burning cartridge powder is greater than the volume within the barrel.

present singular third person overbores · participle present overboring · participle past overbored · past overbored

1. transitiveengineeringTo modify so that the capacity of the burning cartridge powder is greater than the volume within the barrel.
2. automotiveTo bore out more than is usual for the design; especially, to bore out to a degree that pushes the limit regarding the wall thickness of the casting.

   1 more example

   The Model F engine was an overbored variation of the larger engine first applied to the Model D the previous year. This made it considerably oversquare: 5 inch bore (4.625 on the D) and 4.5 inch stroke displacing 353 cubic inches. It was rated 32.4 SAE horsepower, produced 35 at the same conditions and 40 maximum.

   1985, George Philip Hanley, Stacey Pankiw Hanley, The Marmon Heritage: More Than 125 Years of American Production of World Renowned Products : Marmon, Marmon-Herrington, Marmon-Herrington All-Wheel-Drive Ford, Doyle Hyk Publishing Company, →ISBN, page 40

1. participlepastsimple past and past participle of overbear