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TVR AJP V8 (Speed Eight)

The AJP V8 is TVR’s own V8 engine, designed in-house in the mid-1990s. The name comes from the designers — Al Melling, John Ravenscroft, Peter Wheeler.

Spec at a glance

Section titled “Spec at a glance”
  • Configuration: 75° V8, dry sump
  • Capacities: 4.2 L and 4.5 L variants
  • Power: roughly 350 bhp (4.2) to 420 bhp (4.5), depending on tune
  • Construction: aluminium block and heads
  • Cars: TVR Cerbera (V8 variants), Tuscan Speed Eight, Griffith 500 (limited use)

Known weak spots

Section titled “Known weak spots”
  • Cylinder head porosity — early heads have been reported as porous. Coolant in the oil after a hot run is the typical symptom.
  • Followers and cam wear — service history really matters.
  • Bespoke electronics — the original ECU (Lucas-developed for TVR) is no longer supported. Most current owners are running either a reflashed original ECU, an emulator board, or a modern aftermarket ECU (MBE / TunerStudio).

Rebuild parts — Rover V8 compatibility

Section titled “Rebuild parts — Rover V8 compatibility”

Some AJP V8 internals share dimensions with the Rover V8 (as used in Land Rover Discovery 1/2, Defender 90, Range Rover P38). This matters because Rover V8 service parts are still widely stocked and cheap, whereas AJP V8-specific parts are increasingly hard to source.

Main bearings — Land Rover STC 4299

Section titled “Main bearings — Land Rover STC 4299”

Standard-size main bearing set for the Rover V8 4.0 / 4.6 EFi. Fits the AJP V8 4.2. Made by Glyco, sold under Land Rover’s genuine-parts label.

Land Rover STC 4299 main bearing set genuine parts label

  • Part number: STC 4299 (standard) — also available in .010 and .020 undersize as STC 4299-10 / STC 4299-20
  • Manufacturer: Glyco (H1142/5 STD)
  • Available from: Turner Engineering, LR Direct, Britcar, most Land Rover parts specialists
  • Kit contents: upper and lower shells for all main journals

Check the bearing crush and journal sizes with a plastigauge before final assembly — sharing a dimensional standard with the Rover V8 does not remove the need to measure.

Section titled “Related deep dives”