# Tilton race clutch

- Source: https://racingcarnetwork.com/wiki/tilton-race-clutch/
- Publisher: Racing Car Network (racingcarnetwork.com), the race car marketplace
- Type: gearbox · Brand: Tilton
- Discipline: parts
- Era: 1990s
- Last updated: 2026-07-06

Tilton is the small-diameter clutch standard: the Californian engineering house whose 5.5- and 7.25-inch metallic multi-plates, flywheels and pedal assemblies equip formula cars, GT machinery and serious club builds worldwide.

## Specifications

| Spec | Value |
|---|---|
| Type | Racing clutches + driveline controls |
| Range | 5.5"/7.25" metallic multi-plate core |
| Application | Formula, sports racer, GT, rally builds |
| Components | Flywheels, release bearings, pedal assemblies |
| Wear | Published stack specs = measurable condition |
| Servicing | Full rebuild-parts catalogue |
| Years | 1995–present (heritage to 1970s) |
| Class | Competition driveline standard |

## History

Tilton Engineering built its name from McLaren-adjacent 1970s roots into motorsport's driveline-and-controls specialist: racing clutches in the small diameters competition demands (5.5-inch and 7.25-inch metallic multi-plates the core), matched flywheels, hydraulic release bearings, and the pedal assemblies and master cylinders that made 'Tilton pedals' a generic term in scratch-built racing cars.

The engineering logic drives the catalogue: small-diameter multi-plate clutches minimise rotational inertia (engines rev faster, shifts happen quicker) while metallic friction materials survive launch abuse — the specification formula cars, sports racers, GT and rally builds converge on regardless of badge. OEM-motorsport and constructor relationships spread the hardware through customer racing invisibly.

The consumable economy defines ownership: clutch packs wear and are rebuilt (plates, floaters, diaphragms all catalogue parts), release bearings are service items, and used-market value follows measurable stack condition — Tilton's published wear specs turn inspection into arithmetic. Complete documented assemblies (clutch, flywheel, release system matched) trade sensibly; loose used friction packs are gamble territory.

## Palmarès

Transmitting championship power across formula categories, sports racers, GT and rally builds for four decades — the driveline record of racing's small-diameter standard, present wherever a scratch-built car's pedal box says Tilton.

## What to check before you buy

Measure the stack: Tilton publishes wear limits — plate and floater thicknesses against spec convert a used clutch from mystery to arithmetic, so inspect or walk. Match diameter, spline and stand height to your engine/gearbox combination exactly (5.5 versus 7.25, spline counts, flywheel pattern — catalogue precision matters). Check diaphragm condition and release-bearing travel compatibility. Metallic clutches hate slipping street-style — abuse history shows in heat discolouration. Complete matched assemblies with invoices are the honest buys; rebuild parts availability from the catalogue keeps any core serviceable, which anchors used pricing.

## Did you know

- 'Tilton pedals' became generic vocabulary — scratch-built racing cars specify the pedal assembly by brand name the way builders say 'Hewland' for gearboxes.
- Small-diameter clutch logic is rotational physics: a 5.5-inch pack's inertia lets engines gain and shed revs at rates street-diameter clutches physically can't.
- Metallic multi-plates engage like switches, not dimmer knobs — the launch technique they demand is half the reason formula-car starts look violent.

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