![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnbP82WPqS2YXT57J9vS26_jctiapie_G0dOdoVv-TkBJJlhoLvfiWgRgxjEUt9YygXWJ0CniZiRd1BKGc61zLMvZZlDGZvacHj_iFfp7aqHVwnXinR2Cj3DTFKtDwPwmE0qOKz-YMjV4Y/s400/RR+250-C20R.JPG)
cessna185 is close enough with his answer.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtxStlazkiOsdm62Uiy6EORIEiqK9s-FHibxcF6MvISBwGNv1hLf58-l50Wo4-pbYtMmHvayVzoudvOe7MkvlOY6PX3sCUWHfOALncJvVn6OoqYnLHabVccsdWlUnQ1ZwoEDQRkSK4UePS/s400/RR+250-C20R,..JPG)
Above photo shows the near complete unit, but alas with nothing against which to compare its size (or lack of).
As you can determine from the pic below it is a RR 250-C20R/2 (SP) [out of a MD500N].
The (SP) infers it has the Ceco fuel pump.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguXvh_xESAvv_DaN_z0SYS7aFLsAgk0HXlpeyuHu4KxCeMp1OSTfIyNJUGlNsZ1qDAf_d9m_DuIJcb-pwx1hBLEwKoEkJbbdc1nqnjEx8KlGgavEgzznvvpwjHu4xqJW1UlGkkkoJXdIm6/s400/RR+250-C20R.+.JPG)
Originally a development from the Allison Engine Company in the early 60's. Allison was acquired by Rolls Royce in 1995.
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