Wicked
Senior Member
- Messages
- 170
- Location
- North Bay, ON
Holy moly my headkryptonite said:its not that its not a good idea, its just a preferance. a 28.5 and a 30.5 head is the same(except machining). what gets the 30.5cc is the added 2mm stroke from the crank. with that extra lenght on the stroke comes less rpms. but an emense amount of low end torche. the 2mm crank is machined/balanced. when they do that, it lowers the case pressure cousing less rpm's. thats where the "stuffed" crank comes in. the fill the machined area with some sort of plastic to build up the case pressure, giving some of the lost rpms back(but not all). so a 28.5 with a 2mm stuffed crank is a 30.5. then "zen" 27.2 is really a zenoah 25.4 with a 2mm crank.. so as far as it not being a good idea, its debatable. some like the high revs and get the lower end torque with a pumper carb, lightened flywheel or a reed kit, yet still keeping the higher rpms. some like the high torque and can easly gear up. i have a ported 28.5 in my MT and i could use some more power. so a 30.5 is in order after the servo's.
Ok so then what about this one. Its a oneil 28.5 CC with a stuffed crank and a 36mm big bore kit.
http://store.5thscalecanada.com/index.php?main_page=product_info&cPath=14_107_114&products_id=33