When selecting a crankcase breather check valve, the right choice depends on your vehicle type, installation method, and performance goals. This article highlights five compatible options and explains who each product is best for, plus notable limitations to consider. Whether you’re building a universal evac system or tuning a VW or Audi, these picks offer clear advantages for maintaining crankcase pressure and preventing oil leaks.
| Product | Vehicle Type | Installation Quick View | Best For |
|---|---|---|---|
| Allstar Check Valve, Allstar Crankcase Evacuation System, Each (ALL34146) | Universal | Weld-on compatible | Basic evac setup |
| Allstar Performance ALL34145 Crankcase Evacuation System, Weld-On | Universal | Includes breathers/grommets/check valves | Complete weld-on kit |
| A-Premium Engine Crankcase Vent Valve (VW/Audi) | Volkswagen & Audi models | OEM-style replacement | Brand-name VW/Audi fit |
| Check Valves For Universal Crankcase Evacuation System | Universal | Zinc finish | Budget universal valve |
| ACDelco Gold 19313318 PCV Valve | General automotive | OEM-grade PCV valve | Vehicle-specific reliability |
Allstar Check Valve, Allstar Crankcase Evacuation System, Each
The Allstar ALL34146 valve is designed for universal crankcase evacuation setups. It is best for builders seeking a straightforward, weld-on valve to integrate into a basic breather system. The product is suitable for those who want a compact, reliable check valve as part of a custom evacuation line. A potential limitation is that installation may require additional hardware or fittings not included with the valve itself. Choose this if you want a simple, durable solution for a universal kit.
Allstar Performance ALL34145 Crankcase Evacuation System
This weld-on kit bundles breathers, grommets, check valves, and nipples for a complete universal crankcase evacuation system. It’s best for DIY enthusiasts who want an all-in-one kit to standardize an evac setup across different engines. A limitation is that it assumes a weld-on installation, which may not suit every vehicle without metalwork. Opt for this when you need a full, ready-to-install universal kit.
A-Premium Engine Crankcase Vent Valve (VW/Audi)
Designed specifically for Volkswagen and Audi models, this valve fits multiple model years and configurations listed in the product name. It’s best for owners seeking a brand-name VW/Audi fit with predictable geometry. The main caveat is that compatibility is focused on particular models, so verify your exact year and engine code prior to purchase. Choose this for a vehicle-specific, OEM-style replacement option.
Check Valves For Universal Crankcase Evacuation System
These check valves are designed for universal evacuations and come with a zinc finish for corrosion resistance. They’re best for builders who want a cost-effective, broad-compatibility valve that can be adapted to multiple engine setups. A limitation is that universal valves may require additional adaptors or fittings for some installations. Choose this when budget and flexibility are priorities.
ACDelco Gold PCV Valve 19313318
This PCV valve offers OEM-grade reliability for general automotive use. It’s best for owners who want a trusted, high-quality replacement within standard PCV systems. The limitation is that it’s not a universal evac valve—it’s a vehicle-specific valve designed for conventional PCV configurations. Choose this for a traditional, dependable PCV replacement in compatible vehicles.
Buying Guide: Crankcase Evacuation and Breather Valves
- Compatibility: Ensure the valve fits your engine setup and fits any required hoses or fittings. Universal valves offer flexibility, while vehicle-specific valves provide guaranteed fit.
- Installation method: Decide between weld-on kits and retrofit clamp-style valves. Weld-on tends to be permanent and secure, while clamp-style options offer easier swaps or temporary setups.
- Material and finish: Zinc or corrosion-resistant finishes extend life in the engine bay. Stainless steel and coated components resist heat and oil exposure.
- System completeness: For evac systems, consider whether the kit includes breather elements, grommets, and nipples. A bundled kit reduces compatibility concerns.
- Maintenance and replacement: Some valves are designed for simple replacement without disassembly. Check accessibility for inspection and service intervals.
- Vehicle-specific considerations: For VW/Audi models, confirm exact year, engine code, and platform to ensure a correct fit and function.
Frequently Asked Questions
- What does a crankcase breather check valve do? It prevents backflow of crankcase gases and oil mist while allowing proper venting to the intake or evacuation system.
- Are universal valves suitable for any engine? Universal valves offer broad compatibility but may require adapters or custom fittings for some engines.
- Should I choose a weld-on or clamp-on kit? Weld-on provides a permanent install with secure sealing; clamp-on offers easier removal and swapping for temporary setups.
- Is a vehicle-specific PCV valve better than a universal one? For reliability and fit, vehicle-specific parts match OEM design; universal parts prioritize adaptability.
- Can these valves cause leaks if not installed correctly? Improper installation can lead to leaks or poor evacuation performance, so follow manufacturer guidelines or professional assistance.
- Do these parts affect engine performance? Properly installed evac valves help manage crankcase pressure and reduce oil leaks, potentially stabilizing engine breathing in tuned setups.