Originally posted by cdelong
Tom,
No it was not revving high. The bottom end is rich if anything- pinch test is a tad higher than I normally run it~ 4 seconds till it stalled out. I didn't think 260F was too bad for sunday in Mentor (HOT!!). I was running 240's saturday and the tank was almost dry after every heat.
You made some nice runs Tom, didn't meet you, but I heard your name called all weekend long.
On my home track I can eliminate the problem by running it around 200F cause the track is small and fuel mileage is not an issue. I've run engines 240- 260 with no issues and good longevity. This thing has got me a little stumped. Guess I'll have to richen it up on the high end as to prevent the vapor locking.
Thanks all!!
I'm not sure who you are but thanks! Perhaps you're clutch tension is too tight. If you're clutch is spooling out too much that could cause high temp on the front of the engine where the carb is. I have this same motor and I had this exact same problem with mine too. I was running 1/8th at mentor so I haven't run it lately to solve the problem yet. By fatting up the bottom end I was able to get the motor restarted. How did you do in mentor? I just had a thought, perhaps running around 200F might not be too bad. Actually 100C (where these motors were designed they use C) is around 210F and that might just be the sweet spot on these new motors. You see before we had motors that had maybe 1 to 1.25 hp, and turned 34K rpm. Now we have motors that turn 1.5 hp and turn 44K rpm. They might need that extra fuel to feed the beast and keep them cool. Fuel comsumption you can play around with by using less nitro, or different pipes because I think at these summer temps 30% might just be too much. Also if you loosen your clutch spring out, you will get better fuel consumption too. I've pit for Ben Puterbaugh and he kept it running around 210 and his motor was fast.