I have a Husqvarna 44
What can I do to the muffler on this one?
By my 'brief' calculations, the exhaust port at piston is ~230mm^2 (hard to calculate accurately)
So the ideal exit area would be between 184mm^2 and 196mm^2 (80 and 85%)
the existing exhaust port is 113mm^2 so I'd need to drill an additional hole that would yield an area of ~70-80mm^2
Do I just therefore drill an additional hole of between 9 and 10mm in diameter?? If so where?
Or must I port out the existing exhaust to 15mm diameter?
There isn't a spark guard at present as my guess is due to the baffled design this takes care of its self internally
Finally, is it essential to have a tube fitted or would a hole just suffice?
What can I do to the muffler on this one?
By my 'brief' calculations, the exhaust port at piston is ~230mm^2 (hard to calculate accurately)
So the ideal exit area would be between 184mm^2 and 196mm^2 (80 and 85%)
the existing exhaust port is 113mm^2 so I'd need to drill an additional hole that would yield an area of ~70-80mm^2
Do I just therefore drill an additional hole of between 9 and 10mm in diameter?? If so where?
Or must I port out the existing exhaust to 15mm diameter?
There isn't a spark guard at present as my guess is due to the baffled design this takes care of its self internally
Finally, is it essential to have a tube fitted or would a hole just suffice?