do not press the back button…
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
- Porsche 911 1978-1983 3.0L / SC
Crankshaft Standard (STD)
The
standard size (STD) crankshaft is a key rotating component for the classic Porsche
911 SC (3.0ltr).
Fits:
Engineered to match original build specifications, this crankshaft ensures proper journal dimensions, smooth rotation and long-term durability within the renowned air-cooled flat-six engine. Whether restoring a classic 911 SC or rebuilding a high-mileage bottom end, this precision-machined crankshaft plays a vital role in maintaining authentic Porsche performance.
Designed to maintain original journal dimensions and deliver exceptional strength, this crankshaft plays a crucial role in preserving the smoothness, reliability and performance expected from these high-value flat-six engines.
Whether performing a classic restoration, a bottom-end refresh or a full performance rebuild, this crankshaft is essential for ensuring correct bearing clearances, optimal lubrication and long-term engine integrity.
What the Engine Crankshaft Does
This crankshaft is responsible for key engine functions,
including:
- Converting
piston motion into rotational torque that drives the transmission
- Maintaining
accurate journal diameters to support proper bearing lubrication
- Providing
smooth, balanced rotation across the engine’s entire RPM range
- Distributing
oil internally through precision-machined lubrication galleries
- Supporting
turbocharged loads with a strong, durable crank web and journal design
- Forming the foundation of the bottom-end rotating assembly
A correct standard-size crankshaft is vital to the long-term reliability and performance of any air-cooled Porsche flat-six.
Why Crankshafts Can Fail
Even though Porsche engineered these crankshafts for
durability, decades of use and performance driving can lead to wear or damage.
Common causes of failure include:
- Oil
starvation resulting in journal scoring or bearing failure
- Metal
fatigue from high RPM use, boost pressure or detonation
- Contamination
in the oil supply causing abrasive wear
- Overheating
weakening the crankshaft’s molecular structure
- Incorrect
machining from past rebuilds creating imbalance or mismatched
tolerances
- Severe
knock events bending or cracking the crankshaft
- High-mileage wear reducing journal roundness and bearing clearances
Symptoms of crankshaft-related failure include low oil pressure, metallic knocking, vibration, bearing debris in oil, and uneven rotation during teardown.
Why You Should Replace a Damaged or Worn Crankshaft
Installing a new or precision-built standard size crankshaft—designed to match original Porsche performance tolerances—ensures a strong, balanced and reliable engine rebuild.
Key benefits include:
- Restored bearing clearances and stable oil pressure
- Smooth, balanced engine rotation at all RPM ranges
- Reduced vibration and improved power delivery
- Enhanced reliability under turbocharged loads
- Prevention of severe bottom-end failures
- Increased lifespan of pistons, rods and bearings
- Assurance of correct geometry for high-performance use
For a Porsche 911 SC rebuild, choosing the correct STD crankshaft is one of the most important steps in achieving a long-lasting, dependable engine.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010201508
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
Fits:
Porsche 356 A / 356 B
*** NOT for Super 90
Click 'Zoom in' for large parts diagram.
Diagram Ref No 13.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
54610190100
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 356 1950-65
Porsche 912 1965-69
Click 'Zoom in' for large parts diagram.
Diagram ref no 16
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
61610216301
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits: Crankshaft Pulley End
Fits:
Porsche 356 1950-65
Porsche 912 1965-69
Speedi Sleeves to Repair Worn, Grooved Seal Surfaces
Over time, sealing surfaces will become grooved, making a good seal impossible.The most economical and fastest method of shaft repair is to install the CR Speedi Sleeve. Speedi Sleeve is a precision engineered piece of stainless steel. It's ultra-thin wall design allows it to be used without changing the sel size ans its finish is perfect for lip sealing applications. Speedi Sleeve is built with removable installation flange. The installation tool included in every box allows the seal to be put in. This avoids the possibility of distortion from heat or other installation methods.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110299189
The product you are viewing cross references to these numbers