http://www.knology.net/~rv7rotary/Ro...0nitriding.htm
Rotor Facts:
If you lay a straight edge across the depression longwise and measure from the bottom of the straight edge to the deepest part of the depression you can determine the compression ratio of the rotor:
- 4mm = 9.7:1 compression ratio
- 5.5mm = 9.4:1
- 7mm = 9.1
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1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles
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