Quote:
Originally Posted by berfinroy
Wondering if the advance curve for the preceding M116 3.5 is "better" than was used on the M117 which had to be designed to meet more stringent US smog regs that went into effect in 1972. If so, can the M116 curve be achieved merely by switching advance curve springs?
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b:
Have you determined the shape of your existing M117 advance curve? If not, perhaps you can locate a shop near you that has an old-style Sun distributor testing machine. Those machines mechanically drive a distributor, and are capable of determining degrees of centrifugal advance vs. RPM. The vacuum units (if installed) can also be checked for the amount of advance and/or retard that they provide.