Originally Posted by
Rebellion
I have a question for HHH.
Your standard engine had few washers in the combustion chamber?
And if you've modified you based?
I use both the S and C version and both are modified by MH (Michael Heinrichs). You can tell if modified by the engraving on the side of the engine case and a number engraved on the sleeve and crank. Look at the pervious pics I posted on this thread to see.
I run .30 which is how comes, .35 and .40 mm shims depending on the fuel and how lean I am going to run or push the engine.
0.40 is good for a lean top end for fuel economy or if using 25% nitro.
0.35 is good to feel safe (avoid detonating) when you are not sure if your fuel is good (control fuel race) or you are having glow plug problems or just "feel" your piston might be hitting the button head.
If my home track and fuel and I am comfortable and happy with performance then I use 0.30.
In the S I always use 0.35 because I had detonation using 0.30