Inframe vs ourframe pipe

[BansheeWanted]

hi guys

 

what is the MAIN different ( in performance ) between the inframe pipe and ouframe pipe ?

 

my brother looks to build 7mm stroker motor( drag porting ). he is asking if he can use it for long period with low speed ( non-stop 30 min for example ). I know he should re-jet it and tune it 100%. but can he use for normal riding also ?

 

thanx

[sredish]

you'll want the inframes for normal riding. They both work really well but the outframes aren't a good choice for any normal riding.

[MotulMonsta]

The expansion chambers on outside pipes can be make a whole hell of a lot larger as the pipes arn't restricted to the confines of the frame. Those pipes if tuned properly to your motor will produce a hell of a lot more power then inframe pipes...outside pipes are usualy custom one off jobs and they cost quite a bit -o- cash...But since they stick out so damn far they are realy prone to getting damaged by debris and trees and rocks and chickens and little boys and kittens and your barbee collection. Standard pipes on the otherhand AKA Toomey, DG, FMF, CPI, DMC..ect..they are designed to operate within a broader range and arn't as tempramental to minor changes like mild portwork, larger carbs and over bored cylinders with stroked crank..that won't upset these pipes as much an a custom drag pipe designed to work with a specific engine setup.

[sredish]

there you go. more than my little brain put together at that moment.