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HD Semi-Solid Engine / Transmission Mount Set. Porsche 911 / 912 1965-89 - 91137504306
91137504306/4
Vehicle Group
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Information
HD Semi-Solid Engine Mount Set.
What This Product Does:
Symptoms / Indications That Replacement Or Upgrading Is Needed:
Why Upgrading to HD Semi-Solid Mounts Matters:
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91137504306
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Enhance drivetrain precision and performance with the HD Semi-Solid Engine / Transmission Mount Set, designed specifically for Porsche 911 and 912 models
These heavy-duty mounts replace the factory rubber units with a semi-solid, high-durometer compound — around 25 % firmer than standard — providing improved control and response without sacrificing comfort.
The semi-solid design effectively reduces engine and gearbox movement under acceleration, braking, and cornering, giving sharper throttle response, smoother gear changes, and tighter handling stability.
One kit includes 2 halves of mount, (2 kits required per car).
Fits:
Work as engine mounts in 1965-1989 911/912/930
Work as transmission mounts in 1972-1986 911/912/930 (915/930 Transmission Only)
What This Product Does:
- In the Heavy Dusty semi-solid version, the stiffer rubber reduces unwanted flex while still providing some damping, hence a compromise between fully soft and fully rigid (solid) mounts.
Symptoms / Indications That Replacement Or Upgrading Is Needed:
- Engine / gearbox movement or “rocking” under throttle or deceleration
- Clunking or banging noises from the engine bay when shifting or applying torque
- Increased vibration in the cabin or floorboard
- Misalignment over time, causing stress or wear in driveshafts, couplings, or mount brackets
- Feel of looseness or lag in throttle response or drivetrain “lash”
Why Upgrading to HD Semi-Solid Mounts Matters:
- Sharper Response & Less Flex - Because mounts deflect less, the engine / gearbox stays more stable under load, improving throttle response, shift feel, and power delivery.
- Better Drivetrain Alignment - Less movement helps maintain correct angle relationships between engine, gearbox, driveshafts, etc., reducing stress and wear.
- Improved Stability Under Load - During hard cornering, braking, or acceleration, stiffer mounts help avoid drivetrain “twist” or slop, which can upset handling balance.
- Dampening Retained - Semi-solid design still absorbs vibration and noise more than fully rigid mounts, providing a balanced tradeoff for street use.
- Straightforward Installation - Because the inserts fit existing mount shells, installation is simpler — no need for custom brackets or drastic modifications.
- Good for Performance / Restoration Builds - Especially in cars that see spirited driving or occasional track use, the HD semi-solid mounts are a common upgrade that improves control without completely sacrificing comfort.
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91137504306
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€45.01
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Information
Engine upper support bracket.
Fits:
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Click 'Zoom in' for large parts diagram.
Diagram ref no 1
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Click 'Zoom in' for large parts diagram.
Diagram ref no 1
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Information
Engine upper support bracket.
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Click 'Zoom in' for large parts diagram.
Diagram ref no 1
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Click 'Zoom in' for large parts diagram.
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Information
Engine mount bolt M10x80
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Click 'Zoom in' for large parts diagram.
Diagram ref no 3
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