Originally Posted by Pattojnr
i have raced a force 12, i had 2 engine failures in 2 months, just 4 race meets. firstly, front bearing failure, destroyed piston and sleeve. second, crankshaft faiure, pin on end of pullstart somehow broke, not when starting it either, mid race. i had it replaced, but 2 failures costly to points. i was mainly running around 5th to 6th, with the force, never run engine above 230f max. guys at front were all os 12cvx, i have switched this season to the OS. less moving parts in pullstart, easier tuning, and now setting the pace, 5 points clear of second place, and TQ every round. go the OS.
Bearing faliure is a common problem as two major bearing manufacturers have subbed their work to china and the bearing standards have gone down.. front bearing faliure will cause your entire engine to blow if its not caught in time... Pins, Rods and pistons will wear because of a lean fuel setting caused by bearing failure, so having said that the actual motor its self is not to blame ..
I have to stick up for the force, they arent a high performance motor but they are great value for money.. i purchased 6 force .25 motors for experimentation with fuels and mods .. and the force motor is strong.... for what i put one motor through would make your skin crawl.. and it still runs after 17 + litres of deliberate and un relenting punishment.. It was not unusual for me to hold this thing at WOT off the ground for up to a minute at a time.. Mind you i am experimenting with some hi tec oils and that would have saved it but still 17 litres of this..
Anyway i just wanted to give my 2 cents.. Remember that there are so many variables to something going wrong.. its not alwys the engine
CheersMM