hi low bucks well to help you out a little , novarossi , O.S. , alpha , RB concepts , Werks nitro engines are nice have more HP and more ports , you can go ,15 ,16 , ,18 tops size motors . some of these motors crank out good HP , there is regular type glow plug motors
and there are turbo type glow plugs and motors with a different style type heads on them they may require higher percentage nitro fuel or recommend , fuel and will spool up faster too you can try NITROHOUSE.COM FOR various motors to purchase or A MAINHOBBIES .COM , you might be into high bucks racing , you can read about some of this stuff on you tube too ok hope i helped mugey