Aston Martin High Torque Gear Reduction Starters (1.9HP)(This starter replaces the Lucas number 25677 starter, used in sixties Aston Martins, DB4 5,6.)
The gear ratio of the starter is 4.44:1 which enables the starter to develop its unique torque values.
Bearings vs. Bushings:
The Hi-Torque starter is equipped with five (5) full roller bearings while the typical Lucas unit uses two (2) bushings to suspend the armature.
The design of the Lucas solenoid is very susceptible to Hot Start Syndrome. The windings of the solenoid are encapsulated in steel. There is no means for the heat to dissipate. The solenoid of our Nippon Denso Hi-Torque Gear Reduction starter is encased in aluminum. Our solenoid is equipped with a vent hole. Every time it is engaged, it pushes (pulls) cooler air into the solenoid area thus virtually eliminating the Hot Start Syndrome.
No load condition @ 11.5 volts
Max current (amps) – 90 or less
Minimum speed (rpm) – 3000 or more
8.0 volts are minimum voltage requirements
Torque – .65 kg-n
Maximum current (amps) – 250 or less
Minimum speed (rpm) – 1180 or more
Voltage – 2.5v (at least 7:1 CR)
Max current (amps) – 300 or less
Minimum torque (kg – n) – .7 or more
Voltages – 12v
Output – 1kn
Rating (seconds) – 30 seconds
Torque rating – 535 ft. lbs
NOTE: Torque rating is based on a 9 tooth pinion gear.