A Guide to Selecting Spark Plugs for the 1967-1968 Glas 1600 GT
Keep your classic BMW-powered Glas running strong with the right set of new spark plugs.
- Stick with standard copper-core spark plugs from brands like Champion or Autolite for best performance.
- Avoid modern platinum or iridium plugs, as they are not designed for this car's ignition system.
- Always check and adjust the spark plug gap to between 0.024" and 0.030" before installation.
- Replacing spark plugs is an easy and inexpensive DIY job that can significantly improve engine performance.
Signs of Failing Spark Plugs
When spark plugs wear out, the engine in your Glas 1600 GT won't run as it should. The signs are usually easy to notice. Worn plugs can't create a strong, consistent spark, leading to poor combustion.
Common symptoms include:
- Rough Idle: The engine may shake or vibrate when the car is stopped.
- Engine Misfires: You might feel a stumble or hesitation from the engine, especially when you accelerate. This can also cause a blinking check engine light.
- Reduced Power: The car may feel sluggish and not as responsive when you press the gas pedal.
- Poor Fuel Economy: Inefficient combustion means you'll use more gasoline than usual.
- Difficulty Starting: A weak spark can make it hard for the engine to start, especially in cold weather.
Known Issues for the Glas 1600 GT
Searches for recalls or technical service bulletins (TSBs) for the 1967-1968 Glas 1600 GT did not find any issues related to spark plugs. Searches often confuse this classic car with the modern BMW K1600GT motorcycle, which has had recalls for unrelated components. Known issues for the classic Glas GT are typically related to body corrosion and suspension wear, not the ignition system.
Choosing the Right Aftermarket Spark Plug
For a classic car like the 1967-1968 Glas 1600 GT, which uses a BMW M10-family engine, the best choice is often the simplest. The original ignition system was designed for standard copper-core spark plugs. While modern plugs made of platinum or iridium are available, they are not recommended for this vehicle as they may not perform well and can lead to fouling.
Brand Recommendations
Original plugs were likely from German brands like Bosch. However, reputable American brands offer direct, high-quality replacements that work perfectly in this engine.
- Champion (Good): Champion is a well-known brand that produces reliable copper spark plugs. The Champion N9Y or N9YC is a common cross-reference for the original Bosch plugs used in this era of German cars and is a suitable choice for your Glas GT.
- Autolite (Good): Autolite also provides dependable copper-core plugs. The Autolite 63 or 64 are listed as compatible replacements for this application. These plugs often feature a built-in resistor to reduce electromagnetic interference.
Pro Tip: Check the Gap! Always check the spark plug gap before installation using a gapping tool. For the Glas 1600 GT's BMW engine, a gap of around 0.024 to 0.030 inches is appropriate. Setting the gap correctly ensures a strong, efficient spark.
Aftermarket Spark Plug Cost for Your Glas 1600 GT
The cost for a set of four new aftermarket spark plugs is very affordable. Prices will vary based on the brand and retailer, but you can expect to stay within a budget-friendly range.
| Item | Price Per Plug | Price for Set of 4 |
|---|---|---|
| Aftermarket Spark Plug (Autolite, Champion) | $3.68 - $12.36 | $14.72 - $49.44 |
Frequently Asked Questions (FAQ)
How often should I replace the spark plugs?
For standard copper spark plugs in a classic car, a good rule of thumb is to replace them every 15,000 to 30,000 miles, or every few years. Since they are inexpensive, changing them regularly is great preventative maintenance.
Should I use modern Iridium or Platinum plugs?
No. The consensus among classic BMW owners is to stick with standard copper-core spark plugs. The ignition system in your Glas 1600 GT was not designed for these plugs, and using them can sometimes cause performance issues.
What tools do I need to change the spark plugs?
The job is very simple and requires only basic tools. You will need a ratchet, a short extension, a 13/16" (21mm) deep spark plug socket, and a spark plug gapping tool.
Do I need to replace all four spark plugs at once?
Yes. It is always best practice to replace all spark plugs as a complete set. This ensures even performance across all engine cylinders.
Technical Specifications
OEM Part Numbers: Bosch W200T30 Beru 200/14/3A
Thread Size: 14mm, Hex Size: 13/16" (21mm), Reach: 19mm (3/4"), Recommended Gap: 0.024" - 0.030"
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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.