Plenum porting surface roughness question - ZR-1 Net Registry Forums

mike100 · 03-07-2011

Long explanation short- gonna leave as much of the rough texture below the injectors as possible, but as far as the ported I/H lengths and plenum radius- should I purposely rough up the sides? They are far from polished, but feel smooth to the touch.

Does it really matter?- I'm sure the volume increase is going to add hp as it is a well documented mod.

the plan is to open up the head primary a little -maybe about 1 inch down from a semi-tapered i/h port to about 35mm on the bottom.

03-07-2011	#1
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Plenum porting surface roughness question Long explanation short- gonna leave as much of the rough texture below the injectors as possible, but as far as the ported I/H lengths and plenum radius- should I purposely rough up the sides? They are far from polished, but feel smooth to the touch. Does it really matter?- I'm sure the volume increase is going to add hp as it is a well documented mod. the plan is to open up the head primary a little -maybe about 1 inch down from a semi-tapered i/h port to about 35mm on the bottom.