Air outtake engine bonnet splitter Mansory Carbon for Bentley Bentayga
Mansory Air Outtake Bonnet Splitter — Bentley Bentayga
The Mansory Air Outtake Bonnet Splitter is a functional carbon-fiber air-vent assembly mounted on the hood or cowl area, designed to expel hot air from the engine compartment during spirited driving and sustained load. This component works in concert with the Mansory NACA hood intakes—cool air enters via the hood NACA ducts (front cooling), and hot air exits via the bonnet splitter vents (rear heat management). The result is a measurable reduction in under-hood temperatures, particularly beneficial during track driving or summer highway runs. The splitter's 3K twill-weave visible carbon and aggressive angular design reinforce the Mansory styling language, making it a visual centerpiece of the front-end transformation. It integrates with the parent Mansory widebody kit and all cooling-system upgrades.
Aerodynamic Vent Design & Thermal Function
The splitter incorporates dual air-outlet vents (typically 120mm × 40mm each) positioned at the cowl-to-hood junction. The vents are angled downward and rearward at approximately 25° to the horizontal, directing hot exhaust air away from the windshield and toward the lower aerodynamic wake behind the hood. At highway speeds (above 80 km/h), the pressure differential between the high-pressure zone under the hood and the low-pressure wake creates a natural suction effect—hot air is pulled out through the vents without requiring fans or active pumping. Under-hood air temperature typically drops 5–8°C in steady-state cruising, and 8–15°C during aggressive acceleration (when engine load peaks and turbocharger boost creates maximum heat). For the W12 twin-turbo Bentayga (608 hp, 664 lb-ft), the thermal benefit is particularly noticeable during summer 30+ °C ambient temperatures or repeated acceleration runs.
Carbon-Fiber Construction & Durability
The splitter is hand-laid from 3K twill-weave carbon, autoclave-cured to match the material standards of Mansory's engine hood and other body-kit components. The visible-carbon finish reveals the diagonal weave pattern, creating visual continuity with the hood and surrounding components. The internal duct geometry is reinforced with a layer of biaxial carbon cloth for fatigue resistance—the vents experience pulsating pressure loads during acceleration, and the biaxial reinforcement prevents micro-cracking over time. The component is sealed around its perimeter with automotive-grade silicone, protecting the hood mounting area from water intrusion. The carbon-epoxy matrix is inherently corrosion-resistant (no oxidation risk), and the glossy topcoat provides UV protection. Expected service life is 8–10 years under normal use, with maintenance limited to periodic washing and wax application.
Installation & Fitment
The splitter mounts on the hood or hood-cowl transition via 6 stainless-steel anchor bolts (M5 threads) that fasten to existing or reinforced mounting points. For Bentayga models with the Mansory carbon engine hood, the mounting points are pre-drilled; for OEM aluminum hoods, a dealer or experienced technician must carefully position and drill the anchor points. The installation process requires removing the hood (or leaving it mounted, depending on access), positioning the splitter, and drilling 6 pilot holes. Total installation time is 2–4 hours. The component is fully reversible—removing it leaves only small 5mm diameter holes, which can be plugged or covered with matching carbon caps.
Compatibility & Model Fit
The Air Outtake Bonnet Splitter is compatible with all Bentley Bentayga first-generation (2015–2019) and facelift (2020+) models. Two variants exist: B15-19 (early models) and B20+ (2020 facelift onwards), with slightly different mounting-point spacing and hood contours. Confirm your model year before ordering; fitment varies by generation.
Pairing with Mansory Cooling Suite
The splitter is most effective when paired with Mansory's carbon engine hood with dual NACA intakes (cool air in) and the parent widebody kit's revised lower-air-dam geometry (improved airflow management). Together, these components create a complete thermal-management system. Standalone installation (splitter only, with OEM hood) provides modest cooling benefit; thermal advantage scales with the overall aerodynamic package.
Performance & Track Use
Owners report noticeably lower engine-bay temperatures during track days, particularly in hot climates. Turbocharger intake-air temperature (IAT) drops by an estimated 4–6°C, which translates to improved turbo efficiency and potentially higher boost stability in back-to-back acceleration runs. Radiator core temperature decreases by 2–3°C under sustained load. For road use, the benefit is most noticeable during summer or in warm climates; in temperate climates, the cooling effect is subtle but measurable with diagnostic equipment.
Lead Time & Ordering
Lead time is 2–3 weeks due to hand-laying and autoclave curing. The splitter includes mounting brackets, stainless-steel fasteners, and silicone sealant. Installation documentation and technical drawings are provided in digital format.
FAQ
Q: Will the vents create drag or instability?
A: No. The low-pressure wake behind the hood naturally accommodates the exiting hot air. Computational fluid dynamics (CFD) studies show negligible drag coefficient increase (ΔCd < 0.01) from the vent additions.
Q: Can I install this on an OEM aluminum hood?
A: Yes. A technician must carefully mark and drill 6 anchor holes into the OEM hood. The bonnet must be removed or secured during drilling to prevent accidental damage. Professional installation is strongly recommended.
Q: What happens in cold climates or winter?
A: In cold ambient temperatures (below 0°C), the thermal benefit is neutral—hot air exiting the vents is still warmer than ambient, so cooling is minimal. However, the splitter does not harm engine-bay thermal management and remains functional year-round.
Q: Can I seal the vents if I want maximum under-hood pressure?
A: Sealing the vents defeats the thermal function and is not recommended. Under-hood pressure buildup (without venting) can stress seals and hoses, potentially causing oil-seal leakage or hose blow-outs. Allow the vents to function as designed.
Q: Will insects or debris enter the engine through the vents?
A: The vents are outlet-only (air flows out, not in). Debris cannot be drawn into the engine bay through the splitter. However, inspect the hood NACA duct inlet periodically for debris accumulation.
