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- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Standard Size Crankshaft (STD)
The standard size (STD) engine crankshaft is an
essential rotating component for the early air-cooled Porsche models.
Fits:
These first-generation air-cooled flat-six engines rely heavily on the strength, balance and accuracy of the crankshaft to deliver the smooth, free-revving performance that made the classic 911 legendary.
Whether performing a true-to-original restoration or a full
bottom-end rebuild, this crankshaft ensures proper bearing clearances, smooth
rotation and the reliability required to support both naturally aspirated and
early turbocharged Porsche engines.
What the Crankshaft Does
This crankshaft plays a central role in engine operation by:
- Transforming
piston movement into rotational torque to drive the transmission
- Maintaining
exact journal sizing for correct oil film and bearing support
- Ensuring
balanced rotation across the entire RPM range
- Supporting
reliable lubrication through precision oil galleries
- Handling
high load and thermal stress typical of air-cooled performance engines
- Providing dependable bottom-end stability for both normally aspirated and turbocharged setups
Without a properly sized and balanced crankshaft, the engine cannot run smoothly or reliably.
Why Crankshafts Can Fail
Although Porsche’s air-cooled crankshafts are renowned for
durability, age, performance use and lubrication issues can lead to failure.
Common causes include:
- Oil
starvation causing bearing damage and journal scoring
- Contamination
in the oil system leading to abrasive wear
- High-mileage
fatigue resulting in stress cracks or journal out-of-round conditions
- Overheating
reducing metallurgical strength
- Incorrect
machining or imbalance from past rebuilds
- Detonation
or pre-ignition placing excessive load on journals
- Corrosion from long storage or moisture intrusion
Symptoms can include low oil pressure, vibration, bearing noise, metal debris in the oil, or excessive crankshaft end-float.
Why You Should Replace a Worn or Damaged Crankshaft
Installing a new or precision-engineered standard size crankshaft—matched to original Porsche tolerances—provides the foundation for a reliable, long-lasting engine rebuild.
Benefits include:
- Restored bearing clearance and proper lubrication
- Smooth rotational balance and reduced engine vibration
- Improved reliability for both standard and turbocharged engines
- Protection against catastrophic bottom-end failures
- Extended lifespan for connecting rods, bearings and pistons
- Consistent performance in high-heat air-cooled environments
For early air-cooled Porsche models, the crankshaft is one of the most critical components that determines the success and durability of any engine rebuild.
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- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 991.1 R 4.0L (500 Bhp) 2016
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
- Porsche Cayman 2.9L 987C MKII 2009-12
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Holy broken bolts Batman! Even the latest generation of DFI (9A1) heads on the water-cooled engines are reporting broken exhaust bolts. Tasks ranging from a simple exhaust system update through an engine removal, are consistently plagued by snapped, rusted, and broken exhaust manifold bolts. Rarely can an accurate removal of the broken bolt be performed with the engine in the car, and even after removal, the task is time consuming and if not done carefully can lead to a damaged head or faulty repair. STOMSKI RACING's answer to these problems is the SR069, a kit that easily, accurately, and flexibly allows you to drill out the broken bolts - with the engine still in the car- saving time and headaches. A CNC milled plate indexes precisely off the broken bolts and/or bolt holes. Using our uniquely designed Thumb Screws, the SR069 plate is locked in place (by threading a Thumb Screw over a broken bolt or by using a supplied bolt threaded through the SR069 Thumb Screw). With the included pilot drills and drill guides, the faulty bolt can be drilled out, producing a perfectly perpendicular and centered hole that if necessary can be chased with an included M8x1.25 tap.
Kit includes anodized aluminum fixture, drill bits, tap with extension, drill jigs/guides, Thumb Screws, and hardware in a sturdy storage case. Also includes our SR065D drill guide.
100 Plasigauge strips per box
PLASTIGAUGE PL-A is widely used in the measurement of clearance in plain automotive bearings. Measurement of clearance in big-end bearings can be achieved without dismantling the crankshaft.
For measurements of: 0.001″ to 0.007″ (0.025mm – 0.175mm)
Suitable for use at temperatures between 0°C and 35°C
Contents:
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