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Smart quod bastardus
 
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Join Date: Oct 2002
Location: Baltimore, MD, USA
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79 930 crank pulley

Have a 79 930 and was wondering if the crankshaft pulley is also a harmonic balancer. It has the dual pulley for both the alternator and A/C drive, but I cannot tell from looking at it in the car whether it is a solid steel pulley or if it had a rubber disc to act as a typical harmonic balncer pulley.
Anyone know for certain whether it is a solid one piece design or not?

Thanks,
Fred
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 10-08-2007, 07:27 AM
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My two groove 79 930 pulley was solid.
I also have an 89 930 two groove which is solid.

I noticed on both a 964 and a 993 motor there was rubber isolation which appeared to be for harmonic (edit) dampening.

Last edited by Jim2; 10-08-2007 at 09:15 AM..
Old 10-08-2007, 07:57 AM
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It is not a harmonic balancer, the crankshaft and flywheel are internally balanced as a single unit.
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud
Old 10-08-2007, 08:19 AM
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Smart quod bastardus
 
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Thanks guys......just what I suspected.
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 10-08-2007, 10:22 AM
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