Air outtake splitter for OEM engine bonnet

Air Outtake Splitter for OEM Engine Bonnet Mansory Carbon Ferrari 812 Superfast Stallone

The Mansory air outtake splitter for the OEM engine bonnet is a carbon insert that fits within the existing bonnet vent louvres of the Ferrari 812 Superfast, directing the heat generated by the naturally aspirated 6.5L F140 GA V12 upward and rearward through the OEM vent aperture at a precisely calibrated angle. Unlike aftermarket engine bonnet replacements that involve full bonnet removal, this splitter mounts into the existing OEM vent geometry — making it compatible with the factory bonnet finish and available to owners who retain the OEM bonnet rather than specifying a full carbon bonnet. It is listed within the Mansory Body Kit for Ferrari 812 Superfast Stallone for owners specifying the widebody Stallone kit who want to address V12 heat extraction as part of a complete thermal management upgrade without replacing the bonnet itself. The 812 Superfast's F140 GA V12 is a naturally aspirated engine running extremely high compression and a 8,500 rpm redline; oil temperatures at the summit of the rev range in hot ambient conditions can reach 120–130 °C, and supplementary directed bonnet venting through this splitter contributes meaningfully to sustained oil temperature management in slow urban traffic where ram-air bonnet venting is minimal.

Construction & Materials

The engine bonnet air outtake splitter is fabricated from high-temperature-rated autoclave pre-preg carbon, using a resin system specified to 200 °C continuous service temperature to withstand the radiant heat from the V12 valve covers and cam covers immediately below the bonnet vent. Standard road-car carbon resins are rated to 120–140 °C; Mansory specifies a higher-temperature system for this part given its proximity to the engine's hottest surfaces during sustained operation. The splitter louvre geometry is a 3K twill on the exterior face visible through the OEM bonnet vent aperture, with the internal ducting walls in smooth 2K plain to minimise hot-air flow resistance.

• Weave: 3K twill on visible exterior louvres; 2K plain on internal duct walls
• Resin: high-temperature pre-preg, rated 200 °C continuous
• Cure: autoclave at 135 °C / 7 bar, 120-minute dwell
• Wall thickness: 2.0–2.4 mm on louvre blades; 2.8 mm at mounting flange
• Weight: approx. 0.31 kg
• Mounting: clips and 3M HT VHB tape into OEM bonnet vent aperture flange
• Finish: high-gloss clear lacquer on visible faces; bare resin-coat on internal duct surfaces
• Temperature rating: 200 °C continuous at internal duct face

Design & Visual Function

The primary function of the engine bonnet air outtake splitter is thermal: the 812 Superfast's V12 generates a substantial heat column rising from the engine bay in slow traffic, and directing this column through the OEM vent aperture at a controlled rearward angle — rather than allowing it to diffuse upward and potentially re-enter the cabin ventilation intake at the windscreen base — is both a performance and a comfort benefit. The Mansory splitter angles the exiting hot air at 20° rearward from vertical, which at 40 km/h city speeds is sufficient to keep the heat plume clear of the windscreen base and the bonnet external surface.

Visually, the splitter presents a carbon louvre insert visible through the OEM bonnet vent, adding the Stallone programme's characteristic 3K twill texture to the top of the engine bay visible to pedestrians and onlookers when the car is stationary. The 45° weave alignment is maintained consistent with all other Stallone external carbon panels, ensuring that the small visible area through the bonnet vent reads as an intentional part of the carbon kit rather than an unrelated accessory. The splitter's exposed louvre edges also function as a visual depth cue — the gap between the carbon louvres and the bonnet underside is approximately 12 mm, which creates a shadow-and-louvre contrast that reads as sophisticated engineering detail at close range.

The natural-fibre carbon visible through the bonnet vent is one of the most photographed elements of the Stallone programme by 812 Superfast owners, as it provides the only direct view of the Mansory carbon work from above the car without opening the bonnet — making it a key styling element in overhead-angle photography of the full Stallone kit specification.

Compatibility & Fitment

Designed for the OEM engine bonnet of the Ferrari 812 Superfast (F140 V12, naturally aspirated, RWD, 2017–2022). The splitter fits into the existing OEM bonnet vent aperture on the standard aluminium bonnet — it does not require or include a bonnet replacement. Not compatible with a full carbon aftermarket bonnet, which has different vent geometry. The 812 GTS shares the same bonnet and is also compatible. Symmetric geometry — LHD and RHD cars fit identically.

Installation & Reversibility

The splitter clips into the OEM bonnet vent aperture from below, engaging a clip rail moulded into the vent frame. 3M HT VHB tape along the mounting flange provides supplementary retention against the engine vibration that would otherwise cause clip fatigue over time. Installation requires the bonnet to be open and propped; the splitter inserts upward through the vent aperture and clips into place. Total time: approximately 20–30 minutes. Fully reversible — the 3M HT VHB tape is removable with the standard dental-floss technique on a warm bonnet (to soften the tape adhesive). A Mansory-authorised installer is recommended to avoid scratching the bonnet underside lacquer during clip engagement.

Pairing within the Mansory 812 Superfast Stallone programme

The engine bonnet air outtake splitter belongs to the thermal management and visual-engine-bay enhancement aspect of the Stallone programme. It pairs naturally with the rear bumper air outtake grills, which address hot air extraction from the rear of the engine bay and the exhaust zone. For a complete visual carbon statement from the front of the car to the rear, the front kit and the rear kit frame the bonnet splitter within the full Stallone kit transformation.

Maintenance & Durability

The high-temperature resin specification addresses the primary durability challenge of this part — sustained radiant heat from the V12 engine directly below. Apply a high-temperature ceramic coat (rated to 250 °C) to the clear lacquer on the visible louvre faces at installation, renewing annually. Do not apply conventional automotive wax to the louvre faces — it will melt and leave residue on the louvre surface at V12 operating temperatures. Clean the internal duct surfaces annually with a damp microfibre cloth to remove oil vapour condensation that accumulates on the carbon walls during extended V12 operation at high oil temperatures. Inspect the 3M HT VHB tape bond annually for any lifting at the mounting flange — replace with fresh HT VHB tape if any section has lifted. Lacquer life on the external louvre face is 6–8 years given the elevated temperature environment, shorter than the 8–12 year expectation for body panels in ambient temperature exposure.

Lead Time & Warranty

Lead time 2–3 weeks given the high-temperature resin specification and autoclave scheduling at 135 °C. Covered by Mansory's 12-month warranty against delamination, louvre blade detachment, and clip-mount failure under normal road use and V12 operating temperatures. Damage from improper cleaning products (solvents, petroleum-based degreasers) is not covered.

FAQ

Q: Does this splitter require the OEM bonnet or can it work with an aftermarket carbon bonnet?
A: This splitter is designed for the OEM aluminium engine bonnet vent aperture geometry. Aftermarket full carbon bonnets typically have different vent locations or dimensions, so compatibility with non-OEM bonnets is not guaranteed. Contact us with your bonnet specification for a compatibility check before ordering.

Q: Will this noticeably reduce V12 oil temperatures in traffic?
A: In slow urban traffic where ram-air bonnet venting is minimal, directing the hot air column rearward through the splitter improves convective exit efficiency by approximately 10–15% versus an undirected vent aperture. This translates to a 3–5 °C reduction in peak oil temperature in sustained slow-traffic conditions — measurable but not dramatic, and most beneficial when combined with the rear bumper outtake grills for full engine bay thermal management.

Q: Is the high-temperature resin visually different from standard carbon resin?
A: No — both resin systems produce the same visual appearance under clear lacquer. The HT resin has no amber tint or surface texture difference that would be visible through the lacquer at the louvre face.

Q: Can I open the OEM bonnet normally with the splitter installed?
A: Yes — the splitter is mounted within the vent aperture and does not interfere with the bonnet hinge, latch, or strut geometry. Full bonnet opening and bonnet pin access are preserved.

Q: Does this work on the 812 GTS as well as the 812 Superfast coupe?
A: Yes — the 812 GTS shares the same engine bonnet and vent aperture geometry as the 812 Superfast coupe. The splitter fits both variants of the F140-platform V12 front-engine car.

Add thermal management and visual depth to your 812 Superfast engine bay — enquire for availability. WhatsApp +44 7488 818 747 or [email protected].