Difference 91 and 90 13b
I;m not sure but I heard there is a difference between the 91 and 90 13b motor. Any answers? Something about the rotors?
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91 and 90 are both S5. Almost posotive they are not different. S5 does have lighter rotors than S4 though.
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S5 rotors have higher compression then S4. i think somehting like S4 is 9.4 to 1 and S5 is 9.7 to 1.
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Originally Posted by rotaryspitfire
I;m not sure but I heard there is a difference between the 91 and 90 13b motor. Any answers? Something about the rotors?
I am pretty sure that they are the same, unless your comparing an 88 to 89 Series 4 86-88 have lower compression rotors Series 5 89-91 have slightly different intake manifolds and have higher compression rotors. |
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90 and 91 are identical as far as the engine is concerened. In fact the only differences at all are slight differences in model names and equipment.
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