94mm Long Barrel Cylinders Kit

Elevate Your Custom Engine Build with BUGPACK 94mm Long Barrel Cylinders

When you are pushing the limits of air-cooled performance, standard off-the-shelf components often fall short of the precision required for high-displacement stroker engines. The BUGPACK 94mm Long Barrel Cylinders Kit (AC198940XL) is engineered specifically for the serious engine builder who demands perfection in deck height and thermal management. These cylinders are a massive .800 inches longer than stock, providing the necessary "meat" to accommodate long-stroke crankshafts and extended-length connecting rods without the structural instability of excessive shim stacks. By utilizing these extra-long barrels, you gain the unique advantage of machining the cylinder tops to your exact specifications, ensuring a perfectly dialed-in deck height for optimal compression ratios and combustion efficiency in your Type 1, 2, or 3 performance engine.

Beyond the customizable length, these 94mm cylinders are designed with superior cooling in mind. The deep-finned exterior provides a significantly larger surface area compared to standard barrels, which is critical for shedding heat in high-horsepower applications like sand rails, drag racers, or heavy-duty street Beetles. Heat is the natural enemy of the air-cooled Volkswagen engine, and by choosing a forged material construction, BUGPACK ensures these cylinders maintain their structural integrity and roundness even under the most extreme thermal loads. Whether you are building a 2276cc, 2332cc, or an even larger custom displacement power plant, these XL barrels provide the robust foundation needed to keep your engine running cool and reliable while delivering maximum torque and horsepower.

Precision Fitment for Type 1 Based Air-Cooled Engines

Please note that these 94mm long barrels require the engine case and cylinder heads to be bored to accept the larger 94mm diameter. They are designed for custom high-performance applications including:

• Volkswagen Type 1 Beetle/Bug: All years (Case and Head machining required).
• Volkswagen Type 1 Karmann Ghia: All years (Case and Head machining required).
• Volkswagen Type 2 Bus/Transporter: 1950 through 1971 (1600cc based engines).
• Volkswagen Type 3 Squareback, Fastback, Notchback: All years.
• Volkswagen Thing (Type 181): All years.
• Custom Dune Buggies, Sand Rails, and Trikes: Utilizing Type 1 VW engine cases.

Technical Specifications and Dimensions

• Cylinder Bore Size: 94mm.
• Length Extension: .800 inches longer than standard stock cylinders.
• Material Construction: High-strength Forged material for maximum durability.
• Displacement Potential: Ideal for 1915cc (standard stroke) up to 2332cc+ (long stroke).
• Cooling Design: Deep-fin architecture for enhanced heat dissipation.
• Customizability: Designed to be machined to the exact length required for your specific rod/crank combo.
• Compatibility: Designed for use with 94mm pistons (Pistons NOT included).
• Manufacturer Part Number: AC198940XL (BUGPACK).

Pro Tips from the Appletree Specialist Team

Precision Machining is Key

Because these barrels are .800 inches longer than stock, they are intended as a "blank canvas" for your deck height. You must carefully measure your piston-to-deck clearance with the cylinders installed before machining. We recommend using a high-quality lathe to trim the tops of the cylinders to reach your desired deck height (typically .040 to .060 inches for high-performance street engines). Don''t forget to account for the thickness of any base gaskets you plan to use during final assembly, as even a small discrepancy can significantly alter your compression ratio.

Maximize Your Airflow and Cooling

Since these cylinders are longer than standard, your engine will be wider than a stock 1600cc build. This means your standard fan shroud and tinware may require modification or spacers to fit correctly. Ensure that your cooling tin fits tightly against the fins of these XL barrels; any gaps in the tinware will allow pressurized air from the fan to escape, leading to hot spots and potential engine failure. Proper sealing of the engine compartment is even more critical on these high-displacement builds to ensure the extra fin surface area is actually doing its job.

Check Your Pushrod Geometry

Adding length to the cylinders fundamentally changes the geometry of your valve train. When using these long barrels, you will almost certainly need custom-length chromoly pushrods. After you have machined the cylinders and set your deck height, use an adjustable pushrod tool to determine the correct length required to achieve proper rocker arm geometry. Failing to do this can lead to premature valve guide wear and lost lift at the valve. Always double-check your rocker arm sweep across the valve stem tip to ensure the most efficient transfer of motion from the cam to the valves.