RE: Help W/ Tuning info for Rossi .40 FISE engine
Denis,
Rossi have two black tuned mufflers for their .40-.53 engines.
The [link=http://shop.vendio.com/RossiEnginesUSA/item/2041284246/index.html]#4015[/link] is good for up to ~16K.
Anything that needs to be spun faster, would best be equipped with the shorter #4011. It is good up to and beyond 20K RPM.
Read [link=http://www.rossienginesusa.us/SGME/RossiEnginesUSA/Rossi_Instructions.pdf]right here[/link] to see how much RPM bogs down, when load is increased...
3,200 RPM were lost when changing with the #4011, from an APC 9x7 to a 9x8; clearly the best indication the engine has gone 'off-the pipe'...
With the #4015, the engine only lost just 400 RPM due to this change.
EDIT: Wording.