How can you tell the difference between high compression lightweight rotors,verses low compression rotors. If you have pics please post.

 

I asked the same question before...best way to tell if its a low compression vs high is by weighing it!..Luckily i had both turbo low and high compression rotors sitting in my garage and did the experiment!..YES!..the low compression is heavier and the high compression is lighter. Go to K2RDs website and i think they have the comparisson between the 2.

Oh and PICTURES will not tell you which one is lighter ...
Heck you cant even tell if its series 4 or series 5 rotors...

 

The way I always checked was that the series 5 rotors are milled on the rotor's indented compression face, the series 4 rotors are just cast.

 

Yup i guess it weight that seperates both of them....however series 5 are said to be higher comp as compared to series 4...would love someone to help confirm this.

 

series 4 = 8:5:1

series 5 = 9:somethin:1 any one know the exact #'s for a series five TII

 

Yeah, S5 TII's are 9.0:1 The N/A's are 9.7:1.