When there is a problem with a Brodak engine, it is usually sent to me to evaluate and determine appropriate action.
After having done around 50 different engines, here's one that really has me baffled.
A fellow sent me a Brodak 049 MK II, claiming it would not run for more than a minute or so.
I checked it out, saw no signs of abuse or tinkering, checked the plug, tightened all six bolts and set to work.
It started right up, ran for around a minute and quit!!
Let it cool, tried it again, same thing - always ran a minute or so.
Then the usual: I tried two different fuels, 10 and 25% nitro, 50/50 synthetic/castor.
Then a number of different props - from 5 1/2 -3 up to 6-4.
Six different plugs.
Removed the one head shim.
No matter what I did, same results. Running anywhere between rich and screaming lean, it always ran for around one to one and a half minutes.
The compression is fine and the engine turns over silky smooth and starts easily.
Tiny bit of TDC pinch which is typical for the MK II.
So, any suggestions?
?
Bob Z.