11 bucks? Woah.. that's cheaper than Mazdaspeed USA sponsorship deal.



They want like $37

No doubt! Hook this cracka up https://www.nopistons.com/forums/pub...IR#>/smile.gif

Something I noticed yesterday when I had a close look at a high power shaft, the main bearing oil feeds are offset 3mm towards the ends of the shaft. Since the RX8 stat gears are dimensionally the same as earlier items the only explanation is the stat gears are offset in the RX8 irons.



Because of this I used an FC shaft instead.



Does anyone have some RX8 irons they can compare to earlier ones?

I thought it was RPM, not cylinder pressure, that hosed the stationary gears. The tooth loads rise at an almost exponential rate with engine speed, far more than mere cylinder pressure.

It is Rpm and the mass of the rotor, what made you think it was cylinder pressure?

It was the mention of turbocharging. Series 4 rotors are not the heaviest ones ever used by Mazda, the 3mm seal 13B rotors are much heavier.

That is true, but I just made that comparison due to people saying that the s4 gears are somehow inferior to the s5 gears since everyone seems to be in the mood of throwing away s4's for s5 or rx-8.... Just for trivia, anyone know what the lightest 13b rotor weight is?.. https://www.nopistons.com/forums/pub...#>/biggrin.gif

without considering compression ratios my guess is (from lightest to heaviest)



1.) rx8

2.) S5 NA

3.) FD rotors / 13BRE rotors

4.) S5 TII rotors

5.) S4 NA

6.) 13B GSL-SE 3 mm

7.) S4 TII

I never bothered to weigh them, but #2-4 supposedly are the same weight, as are 5 and 7. So it's 1, 2-4, 5&7, 6.



http://www.mazdatrix.com/faq/rotorwgt.htm

There is one missing from that list , and its the lightest..