In some turbo systems, it may be necessary to restrict the oil supply side of the system to prevent oil leaks and smoking. Special flare jet -4 AN style jet holders are available, w/ several optional restrictors to fine tune the oiling system (similar in design to a nitrous style Flare Jet, except in a larger -4 AN size). These adjustable restrictor jets & holders may also work in some EFI applications to dampen the signal for remote mounted sensors.
- Adjustable Oil Restrictor Fittings
- Use w/Turbo Jet Flare Holder Fitting
- These Fittings Are Made From 303 Stainless Steel
- Use w/-4 AN Oil Supply Hose
Holley Performance Emission Code 5: This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled (Non-Emissions Controlled) Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
Oil restrictor fittings may be necessary on Ball-Bearing style turbos, and are not always required. Check the oiling system carefully and make sure there is not another problem (such as inadequate PVC venting or oil drain restrictions) that is causing the oil leaks and smoking, before restricting the inlet side of the oiling system. If restrictors are used to reduce oil leaks and smoking, start w/ a large restrictor and work your way down carefully to eliminate damage to the turbo (from over restricting the oil).
About Earl's Performance
Earl's Performance Products was founded by Earl Fouts in 1955 in Lawndale, California. The mission was to supply high-quality military aircraft surplus plumbing components directly to the racing industry from a small retail outlet. As the military surplus market dried up, Earl recognized the need for continuity of supply for the racing market and pioneered the Earl's range of hoses and fittings that are still used today. In doing so he created the racing aftermarket plumbing industry.