how much hp do you loose with a spark arestor silencer?im not really worried about getting caught around here so should i get a silencer without the spark arrestor?

 

nobody has any input?

 

Spark arrestor silencers come in a few different styles , these are all patented and have passed the Forestry Department tests for the ability to block small particles from passing through them .

The three different types allowable are as follows :

Krizman - The Krizman is used a lot by the OEM's , and it is marketed by the aftermarket as a Turbin core by FMF . Krizman owns the patent to this design (or invented it originally I can't say I have first hand knowledge of ownership) . On a flow bench it can out flow the silence core and therefore not really take any power away at all .

Supertrapp - The supertrapp design originally started out as a steam disipater on steam engines . The combinations of the cap and discs is also approved by the Forest Service . By adding more discs the flow capacity can be increased easily . I suspect the patent protection on this type is no longer in force , because a few aftermarket companies use a similar design . Please correct me if I am wrong .

Skyway - The skyway patent is simply the correct size screen or perforated plate that will stop particles as needed . It is the poorest flowing spark arrestor of them all .

On 2 cycles engines resticting flow at the silencer slightly from a known *good* rate has a tendency to increase topend power while robbing a bit of lowend this also can raise engine temperatures . The exact opposite is true if you increase flow .

Please excuse my long winded reply , the answer to the question is you may notice a slight change in performance , but not much . If available use a disc system or a Krizman style arrestor if available for your application . The Skyway works too (I use them too) but if you toss things on the flow bench you will find it will change flow the most .


Rick

PS Mr Krizman had a great patent , he never had to manufacture a thing , just collect patent royalties , check your Honda Yamaha Kawasaki or Suzuki muffler , his name is on many.