Re: 1947 Radio + R9-1 Overdrive.
Posted by HH56 On 2016/4/26 11:46:33
Easiest would be to compare schematics. The R11 is much simpler and is definitely disabled when ign sw is off. R9 is powered all the time and issues in wiring to the governor can energize things when unattended.
Additionally, there is no indicator light or circuit on the R11 to let the operator know when ready for OD. A single relay is brought in by the governor and energizes the solenoid. R11 solenoid only has one terminal to energize as both coils are internally connected whereas the R9 has two separate coils in solenoid each with its own power. There is a second relay whose contacts are in the ign cutout circuit. Its coil is in series with one of the solenoid coils so proper operation depends on the correct resistance of the coils in series. In the R11, Ign cutout is essentially only controlled by solenoid contact and goes thru a switch for the positive quick disconnect. The R9 has the solenoid contact and two relay contacts which have to engage or drop out in sequence to ensure the ign cutoff is not lasting too long.
The only electrical components that are the same for both units is the lockout switch and governor. The R11 kickdown sw can be used on the R9 but not vice versa. The common R11 electrical components which were the same as used by other mfgs are being repro'd. Governor and lockout switch was Packard only and not sure the repro solenoid plunger length is appropriate for Packard but maybe could be used.
Attach file:
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Additionally, there is no indicator light or circuit on the R11 to let the operator know when ready for OD. A single relay is brought in by the governor and energizes the solenoid. R11 solenoid only has one terminal to energize as both coils are internally connected whereas the R9 has two separate coils in solenoid each with its own power. There is a second relay whose contacts are in the ign cutout circuit. Its coil is in series with one of the solenoid coils so proper operation depends on the correct resistance of the coils in series. In the R11, Ign cutout is essentially only controlled by solenoid contact and goes thru a switch for the positive quick disconnect. The R9 has the solenoid contact and two relay contacts which have to engage or drop out in sequence to ensure the ign cutoff is not lasting too long.
The only electrical components that are the same for both units is the lockout switch and governor. The R11 kickdown sw can be used on the R9 but not vice versa. The common R11 electrical components which were the same as used by other mfgs are being repro'd. Governor and lockout switch was Packard only and not sure the repro solenoid plunger length is appropriate for Packard but maybe could be used.
Attach file:
(62.43 KB)
(46.62 KB)
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