compression
 

what exactly is the difference between turbo and non turbo rotors? what makes the compression different?

Faces of the rotors. The TII has more of a depression than the N/A rotors. They weigh the same, and have the same dimensions, just the little "dip" on the rotor face is deeper on the TII.

That's how Racing Beat lowers compression on rotors you send to them...they make the depression deeper.

They call it "Milling". How much do they mill out? You know Unique? I have always wondered....

I can't find any info or pics of the process on their site...maybe Mazdatrix has something.

Hmmmm. I have just always wondered how much they remove, where exactly they remove it from, and what they do it with. Guess I'll have to email them!

i think they had pic's in the printed catalog.

mike

so if it had a deeper depression, wouldnt it make it a larger displacement?

Um, not really. It just cahnages the compression. I assume it would change the displacement by a negligible amount.

basically on the compression stroke, with less material there its not going to compress the air as much. Its just the opposite on a piston pusher. When you mill the heads you increase compression.

It shouldn't change displacement at all... it's like putting a thicker head gasket on a piston motor, or boring out the heads (etc etc)

Thanks you saying what I couldn't put into words. I am an engilsh major who can't formulate his thoughts into words!! Go figure!!!

I was about to start drawing diagrams ;)

oh ok understood :)

I would like higher compression rotors for my Turbo. Not way higher just a tad. Better low end and quicker starting........I guess the only way would be to send in some high compression rotors and have them brought down.

S5 Turbo rotors are 9.0:1, S4 NA rotors are 9.4:1 and S5 NA rotors are 9.7:1. Take your pick. :)