A Guide to Spark Plugs for the 1934 Pierce-Arrow Model 1248A
Keep your classic V12 engine running smoothly with the correct new spark plugs.
- Your 1934 Pierce-Arrow Model 1248A requires a full set of 12 spark plugs for its V12 engine.
- Use only standard copper-core spark plugs, like those from Champion; avoid modern platinum or iridium types.
- The recommended spark plug gap is typically around 0.025 inches, but you must verify this and set the gap on each plug before installation.
- No official recalls or TSBs exist for this vehicle; rely on information from classic car communities and specialists.
Signs of Failing Spark Plugs in Your Pierce-Arrow
The ignition system in your 1934 Pierce-Arrow is straightforward, making it very sensitive to the condition of its spark plugs. You won't have a modern 'check engine light' to signal a problem. Instead, you must listen to and feel how the engine is running. Common symptoms of worn or incorrect spark plugs include:
- Rough Idle or Misfiring: The large V12 engine will feel shaky, or you may hear an uneven rhythm from the exhaust at a stop. This is often caused by one or more plugs failing to fire, which is very noticeable in a V12.
- Hard Starting: If several plugs are old or fouled, the engine will turn over but struggle to start, especially when cold. A weak spark cannot easily ignite the fuel mixture.
- Reduced Power: The car will feel sluggish and won't accelerate with its usual authority. Incomplete combustion from a weak spark robs the engine of power.
- Engine Backfiring: Unburnt fuel from a non-firing cylinder can ignite in the hot exhaust manifold, causing a loud popping or banging sound.
Choosing the Right Aftermarket Spark Plug
For a classic vehicle like the 1248A, the concept of "OEM vs. Aftermarket" is different. Original spark plugs from 1934 are no longer in production and are considered collector's items. Modern aftermarket plugs are the standard for any owner who drives their car.
Brand Quality: Champion
Champion is a historically significant brand that was available when your Pierce-Arrow was new. Many classic car owners and restoration experts continue to use Champion plugs because they provide reliable performance that is appropriate for the vehicle's original ignition system. For the Model 1248A, a standard copper-core plug is the correct choice. Avoid modern plugs made with platinum or iridium, as their design is not suited for the voltage and characteristics of the 1248A's ignition system and can lead to poor performance.
Pro Tip: The most important factors are choosing the correct heat range and setting the proper gap. While Champion is a suitable brand, using the wrong part number or an incorrect gap will cause problems regardless of brand quality.
Known Issues, Recalls, and Service Bulletins
Due to the age of the 1934 Pierce-Arrow Model 1248A, there are no official NHTSA recalls or manufacturer Technical Service Bulletins (TSBs) for spark plugs. Pierce-Arrow did not publish shop manuals in the way modern manufacturers do; information was typically passed directly to dealership mechanics. Any known issues are based on the collective knowledge of owners and restoration specialists in communities like the Pierce-Arrow Society and the Antique Automobile Club of America (AACA). The most common "issue" is poor engine performance caused by using spark plugs with an incorrect heat range or gap.
Cost Comparison for Spark Plugs (1934 Pierce-Arrow Model 1248A)
| Part Type | Price Range (Per Plug) | Total for 12 Plugs |
|---|---|---|
| New Aftermarket (Champion) | $3.70 - $4.69 | $44.40 - $56.28 |
| New OEM | Not Available | N/A |
Frequently Asked Questions (FAQ)
How many spark plugs does my 1934 Model 1248A need?
Your Pierce-Arrow Model 1248A has a V12 engine and requires a full set of 12 spark plugs.
What is the correct spark plug gap?
The recommended spark plug gap for engines of this era is generally between 0.025 and 0.027 inches. However, it is critical to consult a vintage service guide or the Pierce-Arrow Society for the exact specification for your car, as it can vary. Always check and adjust the gap on every new plug before installation.
Should I use modern platinum or iridium spark plugs?
No. You should use standard copper-core spark plugs, such as the Champion D16 or an equivalent cross-reference. The ignition systems in pre-war cars like the 1248A are designed for the electrical characteristics of copper plugs. Modern precious-metal plugs require different voltage levels to operate efficiently and will not provide a performance benefit; they may even run worse.
How often should I change the spark plugs?
For a classic car that is not driven daily, it is best to inspect the spark plugs annually. Unlike modern cars with long service intervals, plugs in vintage engines should be checked for fouling (sooty or oily deposits) or wear. Replace them as needed based on their condition and engine performance rather than on a strict mileage interval.
Technical Specifications
Engine: 462 cu in V12. Quantity Required: 12. Plug Type: Standard Copper Core (e.g., Champion D16 or equivalent). Recommended Gap: ~0.025 inches (verify with service literature).
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.