From MACS Products:
We resized one of our standard racing 3.5cc boat pipes to a 6 3/4" 2.8cc custom-racing
pipe.the head pipe (5/8" od) is about 1" long. The front
cone is about 2 5/8" long the high point is 1 1/4"od, the back cone is about
2 5/8 long and the stinger is about 1/2" long and is .333"id.
As an example Norvels, Cox and CS engines have been able to run on a pipe with an increase in rpm.
Other possible RC engines AP .06 , CS Sport .061.
Show me a 1/2A pipe design you think will work this thread needs positive information and solutions.
The header pipe can be used to adjust the length to suit whatever timing an engine has.
It may be dirty and not ideal but could add extra power or for some neat sounding muffler, exhaust
diverter.
