rx8 eshaft measurements....
02-15-2007, 05:17 PM
#13
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Join Date: Nov 2005
Posts: 93
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?
Because of this I used an FC shaft instead.
Does anyone have some RX8 irons they can compare to earlier ones?
02-15-2007, 06:23 PM
#14
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Join Date: Jun 2004
Posts: 524
Originally Posted by Maxt' post='859000' date='Feb 14 2007, 08:29 AM
I read alot that people think that only s5 up and stat gears were hardened, but mazda says that all gears from 85 on were hardened, makes sense, I have never seen a stat gear failure in an s4 turbo and they have the heaviest rotors.
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.
02-16-2007, 07:12 PM
#15
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Originally Posted by heretic' post='859227' date='Feb 15 2007, 05:23 PM
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.
02-17-2007, 08:12 AM
#17
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Originally Posted by heretic' post='859441' date='Feb 16 2007, 07:44 PM
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.
02-17-2007, 10:30 AM
#18
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Originally Posted by Maxt' post='859479' date='Feb 17 2007, 09:12 AM
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?..
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
02-17-2007, 10:46 AM
#19
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Posts: 524
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
http://www.mazdatrix.com/faq/rotorwgt.htm