starter does not turn engine over fast enough Options

[lmcchesney]

Well, as usuall, things progress.
914, 1972 with a 96x78mm four cylinder engine.
When I attach a fully charged battery to the car, turn on the ignition to start, very slow turning over of the engine. Leave the ignition switch in the on position and cross the 12V battery supply to the selinoid of the starter, the engine very slowly turns over. When I remove the screwdriver connection to the selinoid, the starter continues to turn the engine over for a few seconds, then quits turning over, or sometimes, I have to disconnect the battery. Hard to check a compression ratio. New rebuild on the engine (first time the engine is to be started). Compression ration calculated to be about 9.0:1.
Does this mean I will require a hi torque starter for this engine?
Thanks,
L. McC

[lmcchesney]

I checked and I have 12v at the starter. I connected a large (4ga) wire from the neg. pole to the engine case at the fly wheel housing, so the ground of the starter should be fine. Even with jumper cables connected to a runing engine with battery, no improvement in cranking. The starter is about 3 years old. With the cost of a SR86X at $180 and a Hi Torque at $249, which is the best bet?
Further suggestions?
Thanks,
L. McC