Cranks and Pistons
Whats the diff in the cranks of the BPs??? I know the SOHC is cast and the DOHC is forged (right?) Didn't size change at some point (27mm?).
Thanks... ALSO... Its been said SOHC pistons will lower comp ratio in a DOHC. Why is this?? IS the SOHC head diff cc's???? |
guess this one isnt so useless???
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Thanks!!!
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Is any version better than the other??
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I don't know if this was answered in that thread link that edwin posted, but I think the answer you're looking for is in 1990 there was a bad problem with the Keyway failing on the Miata crank, so in 91 they made the crank snout bigger to remedy this. It cost my brother 3 engines last year. On the solo Miata site I forget exactly, but it said that in 1990 they were 19 or 21mm (I forget) and in 1991, they changed it to I think 27 mm.
If thats not what you were looking for then just call me an idiot . |
Originally posted by midnightblue97 I don't know if this was answered in that thread link that edwin posted, but I think the answer you're looking for is in 1990 there was a bad problem with the Keyway failing on the Miata crank, so in 91 they made the crank snout bigger to remedy this. It cost my brother 3 engines last year. On the solo Miata site I forget exactly, but it said that in 1990 they were 19 or 21mm (I forget) and in 1991, they changed it to I think 27 mm. If thats not what you were looking for then just call me an idiot . |
Originally posted by PseudoRealityX Its the keyway that held the pulley on IIRC. It basically would eat itself apart, Davard might be able to answer in more depth...or maybe Mike if he ever checks the damn board. |
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