Originally Posted by buzzallnight
you are still testing this engine
you don't flip start it by hand do you?
Most of the time, I wet prime it and backflip start it. I do not like using electric starters on bushing engines.
you took the muffler off?
that was only good for 500 rpm?
Was it LOUD???
I ran open exhaust on only one prop as noted in my previous post. Only ran it that way as a test to see how much the stock muffler choked it down. Not much I noted. Loud? Incredibly. Also incredibly messy. Oil ALL over my test stand.
you did not try the wood 12 X 5 prop that came with the engine?
No. I do not use wood props.
I plan to remove the carb and replace with a .65 spray bar and needle valve in the carb mounting holes
using a stretch tubing type bladder
for control line
Good luck. The carb is held in by a single drawbar between the carb orifice and the cylinder. If you plan to run it as a CL engine, find a NV and Venturi that fits. I'm unaware of any that fit, this may need to be custom made.
Red line for this engine is 12,500 rpm from the spec sheet I sourced on line.
I would like to prop it to get 12,000 in the air
The engine definitely likes to be loaded down. It will turn faster than 12,800 (the actual top rpm listed by Mecoa for the bronze bushed version) just fine, but it may not be happy. I didn't run mine that fast until I got 3 gallons through it where it was actually breaking in. Mine ran hot before that 3 gallon mark even at 10,000rpm. If it were me, and I want my engines to last, I'd be propping it heavy to turn around 10,500-11,000 on the ground MAX. You're just going to wear it out quickly if you prop it to run faster. This engine will turn a 14x6, but is happier turning a 13x6-13x8.
not sure about running a muffler
I don't have to
and lighter is better
but how loud are we talking here?
I had ear protection on for my 12x6 open face run and it still gave me a headache. It's LOUD.