Quote:
Originally Posted by willardnigma
Well you have the high compression setup. If you want more pulling power I'd lengthen the intake a bit, remove the baffle from the exhaust (if using the standard chinese 2 stroke one) and open it very slightly using a step bit.
and by slightly, I'd make it just 4-5mm larger than it's current opening diameter
Shorter intake and more open exhaust is higher rpm but less pulling power and vise versa.
The intake expansion chambers (boost bottles) have felt like snake oil to me. I haven't seen any improvement from them, just a change in sound that some perceive to be an improvement.
If you're feeling brave you can run nitro to the intake. I will say it is fun, as long as you don't have to turn and there are no potholes.
They do work, but only for a short stent and it's risky |
The Phantom 85 standard exhaust is actually already a lot bigger than the normal.china doll engines. 28mm inside diameter with a straight 19mm exit pipe. The exhaust port matches the pipe and is pretty darn big. The intake side has very aggressive port timing and a steep slope just like the saw it is based off of. With a Reed and windowed piston combined with the exhaust and really good exhaust timing and blowdown right out of the box this engine is pretty torquey as it is. All I have done is bump the compression a bit and port matched the intake to the Reed block. I will actually play with more aggressive stuff later.
Boost bottles aren't worth the time. I have no desire to run nitro or nitrous or any other silly stuff. Premium unleaded is fine by me.