Ninja Engine by GRP
#1067
Tech Adept
iTrader: (2)
Joined: Jul 2005
Posts: 115
From: United States
Thanks for the replies. Last night, I started to go through the pages on this thread. I found some really interesting information ( good and bad ). I did find what most users were running their ninja .12 motors at. It looks like 250-280F is the range. That is something im not really use to because I usually run nova motors at around 230-240F for optimum performance. I've added the copper shim that GRP provided for 30% byron fuel. I've gone through 2 initial tanks and im gonna heat cycle the motor next week. It idles very smooth and fired up after 3 initial start-ups during the first tank. On the second tank, it fired right up imitiately. I can't wait to hit the track and see this motor run after all is done with the break-in cycle.
#1069
For reference I run most of my 12 motors in the 230-280 farenheit range. This is not intentional I tune by feel and sound, but this is where they normally end up. My Ninja also runs in this range when tuned right. It seems that modern 12 motors can regularly hit 280 without significant loss of motor life.
I sometimes use the temps to see if I can push the motor a bit harder on a given day. If i get 3 minutes of hard running in and it temps at 220 I will get my pitman to lean the top out some.
I sometimes use the temps to see if I can push the motor a bit harder on a given day. If i get 3 minutes of hard running in and it temps at 220 I will get my pitman to lean the top out some.
#1071
#1077
#1078
Tech Addict
iTrader: (1)
Joined: Feb 2007
Posts: 511
I had almost the same problem, front 270 degrees or so of the stinger weld just split and the rest stayed together and ripped a little of the aluminum behind it towards the manifold end of the pipe. stinger was bent pointing backwards towards the manifold end. had it rewelded at lhs.
#1080
I had almost the same problem, front 270 degrees or so of the stinger weld just split and the rest stayed together and ripped a little of the aluminum behind it towards the manifold end of the pipe. stinger was bent pointing backwards towards the manifold end. had it rewelded at lhs.



