Piston Window Ports

[duneslinger]

is there an benifit to making these larger and or raising them on a dune ported bike?

[fixitrod]

Are you talking about the intake ports? A lot of builders open the intake area but don't enlarge the port very much unless it's an extreme port job. Like I always say though, every builder is different because it's like an art form of it's own!!!

[duneslinger]

i was asking about the windows in the pistons themself, mine are not moved but i know others that have inlarged theirs and claim it works.

[duneslinger]

was just asking if i should add this mod to my pistons

[mastermarkii]

i dont know..... but personally i heard it does nothing but weakins the piston

[fixitrod]

i dont know..... but personally i heard it does nothing but weakins the piston

Oh, the pistons them selves... don't do it. Why weaken the piston and make it off balance? You won't gain enough to make the motor that un-realiable.

[banshee370]

Fixitrod is correct... if your motor builder wanted them opened up... he would have. On top of that. Done wrong you will DRASTICLY cut the life of your pistons. You could actually fracture the pistons and cause pre-mature and catastrophic failure. Raising or lowering the windows could actually hurt performance if done wrong also. Leave that to your motor builder to decide

[Nighty]

Then what will the larger intake do if your piston skirt intakes are smaller?

 

wouldnt that be the limiting factor then?

[fixitrod]

It increases the amount of time the fuel can enter. The pison will be open to the fuel channel longer if the actual port is larger. It's more reliable to cut the cylinder port than the piston port.