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70SWT's Avatar
 
Join Date: Jan 2004
Location: Sin City
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identifying 2.2 911S crankshaft

My 71 911T allegedly contains a 911S crank in its 2.2L engine. I am preparing to disassemble the engine, as the car sat for many years in storage. A few questions:

How can I identify the crank as an S item on inspection?

Is the benefit of using the S crank simply an increase in compression (changing the stroke range, as the displacement is ostensibly the same)?

If it is present, should I expect to find other S items (rods, etc) or is it typically used with the standard T internals in such an application?

Thanks

Old 07-20-2006, 08:26 AM
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S crank is counterweighted, a T is not.

No increase in compression, that was done by the piston dome.

You never know what else you may find. If the rods are nitrated they well be blackish in color, much darker than non-nitrated rods.
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Old 07-20-2006, 08:43 AM
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A related question, then: is the S crank heavier overall (due to the counterweights)? This wouldn't make sense to me, as I think of S cars as being more free-revving, capable of higher rpms, etc. Or perhaps the counterweights allow smoother operation and thus higher revs despite an overall weight increase...
Old 07-20-2006, 12:03 PM
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S crank is heavier, but SMOOTHER, due to conterweighting, giving the impression of possibly being revvier. It will spin higher than a non counterweighted crank since destructive torque rocking is much lower on the C/W crank. T cranks have been used in race applications to speed up revving, but you can achieve the same effect with a lightened flywheel while still maintaining the high RPM chraracteristics of the S crank.
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Old 07-20-2006, 12:07 PM
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27 lb 6 oz NCW vs 30 lb 12 oz. CW

It is relatively simple to lighten a counter weighted crank.

The best way to achieve stable high RPM characteristics is to lighten both the flywheel and the counter weighted crank.

Changing the fan ratio and running a small fan (226 mm) will do almost as mush.

Lightened 67 mm crank (959 / 961)

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Last edited by Henry Schmidt; 07-20-2006 at 03:00 PM..
Old 07-20-2006, 02:57 PM
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3 restos WIP = psycho
 
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You had to show more unobtainium parts for us to drool over, didn't you?
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- 1980 911SC Targa
- 1979 930
Old 07-20-2006, 03:07 PM
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This one is available on the Pelican 911 parts for sale board.

Only $3,500.00 That's less than a weekend in Vegas.


Hotel $325/night
Buffet $4.50 x 5
1 comp at the "Nuddle Bar"
Trixxie $450/hr
One "all in" with suited connectors. $$$$$$$$$$
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Last edited by Henry Schmidt; 07-20-2006 at 06:03 PM..
Old 07-20-2006, 03:16 PM
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3 restos WIP = psycho
 
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I take it back - obtainium at a price!

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- 1965 911
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- 1979 930
Old 07-20-2006, 03:18 PM
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