I was wondering if some of you guru's out there could help me. I'm forming some ideas in my head and I need to know the weight and compression of each rotor in the list below:

S4 NA 10.04 lbs, 9.4
S5 NA 9.54 lbs, 9.7

S4 Turbo 10.04 lbs, 8.5
S5 Turbo 9.54 lbs, 9.1
13B REW 9.54 lbs, 9.1
20B ?

Are these numbers right? Please feel free to edit any discrepancies! Thanks!

 

You can find a chart at mazdatrix and atkins I THINK

 

S5 turbo and up had compression ratios of 9:1. that is including the 20B, which i would conclude also had a rotor weight of 9.54 lbs.

the rest of your infomation looks correct.

 

The reason I'm asking is because I'm building a 20B Non Turbo. If the information above is correct, then I will be able to use the S5 NA rotors in the 20B and not have to worry about finding a front counter-weight. This would also make finding a flywheel easier...

Thanks Phu5ion!

 

I hope its going to be a peripheral port...

 

Sorry. This project is a going to be streetable, so the PP is ruled out.

 

You know i thought about a N/A 20B. Are you going to use the stock 20B side housings, or are you going to try and mock up some sort of aux. port induction like on 13B N/A's?

I would think that using the 20B side housings would hurt your low end power, but i don't know by how much. On the other hand, using 13B side housings would add another level of complexity.

 

The 20B side housings will be used initally. The plan is to not port the intake side of things in order to keep the intake velocitys higher.

There are a ton of details that need to be worked out prior to adding extra ports in the intake. If the low end performance is not there after the inital install, then I'll mess around with custom intakes.