NOVAROSSI Engine thread....
#7666
ty
#7667
Tech Adept
iTrader: (5)
Hello all,
I am having a bit of a trouble with my nova 21-4. This weekend I was running in the thirty minute main and it was running awesome, great power everywhere all day and great smoke. About 20 minutes into the main I came in for fuel and everything was great but when I left pit lane I had almost no bottom end. When I gave it throttle it had a flat spot right off the bottom then it would rev out like normal and have great top end. There was still smoke all the way through and the glow plug was new that race. I am running byrons 30% like I always have and my temps were a solid 230-235 all day long. I'm not sure what could be going on. Any help would be appreciated.
Thanks in advance.
I am having a bit of a trouble with my nova 21-4. This weekend I was running in the thirty minute main and it was running awesome, great power everywhere all day and great smoke. About 20 minutes into the main I came in for fuel and everything was great but when I left pit lane I had almost no bottom end. When I gave it throttle it had a flat spot right off the bottom then it would rev out like normal and have great top end. There was still smoke all the way through and the glow plug was new that race. I am running byrons 30% like I always have and my temps were a solid 230-235 all day long. I'm not sure what could be going on. Any help would be appreciated.
Thanks in advance.
#7668
Tech Elite
iTrader: (36)
Hello all,
I am having a bit of a trouble with my nova 21-4. This weekend I was running in the thirty minute main and it was running awesome, great power everywhere all day and great smoke. About 20 minutes into the main I came in for fuel and everything was great but when I left pit lane I had almost no bottom end. When I gave it throttle it had a flat spot right off the bottom then it would rev out like normal and have great top end. There was still smoke all the way through and the glow plug was new that race. I am running byrons 30% like I always have and my temps were a solid 230-235 all day long. I'm not sure what could be going on. Any help would be appreciated.
Thanks in advance.
I am having a bit of a trouble with my nova 21-4. This weekend I was running in the thirty minute main and it was running awesome, great power everywhere all day and great smoke. About 20 minutes into the main I came in for fuel and everything was great but when I left pit lane I had almost no bottom end. When I gave it throttle it had a flat spot right off the bottom then it would rev out like normal and have great top end. There was still smoke all the way through and the glow plug was new that race. I am running byrons 30% like I always have and my temps were a solid 230-235 all day long. I'm not sure what could be going on. Any help would be appreciated.
Thanks in advance.
If it was a one time thing, I wouldn't worry about it...
#7669
Tech Adept
iTrader: (5)
Did it continue to do this thru the rest of that tank or just when you left the pits... If it was just the once, I think maybe either the cool fuel hit the carb and acted a little funky or your pit man did an amazing job getting you every drop in the tank and when the lid closed, it may have forced some into the carb and it loaded up.....
If it was a one time thing, I wouldn't worry about it...
If it was a one time thing, I wouldn't worry about it...
#7670
Tech Prophet
iTrader: (96)
At first I was thinking it was the cool fuel into the carb but it continued until the last minute of the race. I was able to finish the race but without low end power. It makes no sense. I did flame out on the last turn but was able to roll across the line to finish and once I was done my pitman grabbed my car and it instantly started back up. It was still doing the same thing though.
#7671
Sound like weak plug, maybe the tune is very lean, new plug will not last...
#7674
Tech Adept
iTrader: (5)
Thanks to everyone so far that has helped.
#7675
Tech Elite
iTrader: (3)
hmm
Well it's not that I lose bottom end as soon as it gets warm. It's happens after 20-30 minutes of driving. But I did take the engine apart to have a look. Everything is in tack inside and the piston and sleeve have minimal metal pinch when cold. Bearings are free moving and nothing looks out of normal. I don't think I pulled a lawn dart moment but it could have happened. When I put the engine back together I seal it and performed a leak test. No leaks found so I put it back in the car. Haven't ran it yet due to weather but as soon as I do I'll pass it along.
Thanks to everyone so far that has helped.
Thanks to everyone so far that has helped.
#7676
R/C Tech Elite Member
iTrader: (10)
Well it's not that I lose bottom end as soon as it gets warm. It's happens after 20-30 minutes of driving. But I did take the engine apart to have a look. Everything is in tack inside and the piston and sleeve have minimal metal pinch when cold. Bearings are free moving and nothing looks out of normal. I don't think I pulled a lawn dart moment but it could have happened. When I put the engine back together I seal it and performed a leak test. No leaks found so I put it back in the car. Haven't ran it yet due to weather but as soon as I do I'll pass it along.
Thanks to everyone so far that has helped.
Thanks to everyone so far that has helped.
#7677
Tech Adept
I also have issues with my old keep off 4 , it's perfect from maintenance point of view, no air leakages and new biella is installed also front bearing. I'm getting a good tune in 10 minutes on about 105 Celcius and then after 15 minutes of run on the track i get too lean low end with temp rises 115-120 Celcius. Car is not drivable with lean low end. When i go to rich it out temp is dropping below 100 Celcius and flame out because of too rich low end. This phenomenon is end of life of piston and sleeve, this is how more experienced racers explain to me this issue. Compression is vary after certain time running or if temperature rises a certain point. I think is reasonable after 60-80 liters of consumption and something to expect.
#7678
P5XLT
I ran my first p5 this past weekend. And I must say you don't need anything else in a buggy (8ight 3.0) . This thing screamed down the straight away with the os and keep offs I couldn't believe it. Granted this is not my first nova (which was keep off 7) but I'm in love with this engine. 9886 41021 combo
Last edited by InARush; 05-12-2015 at 05:54 AM.
#7679
Tech Master
Check that you clutchsprings are new. It could also be that your engine is slightly lean, so it runs hot after some time.
Test this also:
Take brakecleaner and spray right in front of the enignes front bearing. If it dies, and your front bearing is nwe, you have a worn crankcase/crankshaft. If you do, use the Buku crankcasecap. I have used it on many enignes having problems, but moastly they have a tuningproblem
Please give feedback:-)
Test this also:
Take brakecleaner and spray right in front of the enignes front bearing. If it dies, and your front bearing is nwe, you have a worn crankcase/crankshaft. If you do, use the Buku crankcasecap. I have used it on many enignes having problems, but moastly they have a tuningproblem
Please give feedback:-)
#7680
Hey all! With a fully broken in engine cold, will it still be hard to turn the flywheel/crank over by hand? Right now I still cant turn my Nova over when its cold by hand but everytime I run it I notice its getting a little bit easier to turn when cold each time. Is there a point when it stops wearing in and the turn over pressure needed is the same? Will it ever get very easy to turn over cold?