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Z7V —
the 2.7 injection

The Z7V is the first generation's mechanically-injected 2,664 cc: 144 bhp, bore × stroke 88 × 73 mm, compression ratio 9.2. It powers the Renault 30 TX and then the Renault 25; its twin-carburettor variant, type 112.7.30, propels the Alpine A310 with 150 bhp.

2 664
CC
144–150
BHP
K-Jet.
MECHANICAL INJECTION
First generation

The same block, with injection

Same block as the Z6V, but fed by Bosch K-Jetronic mechanical injection: 144 bhp. The Z7V drives the Renault 30 TX, then the phase 1 Renault 25 V6 injection — three indices for one body in model year 1986: Z7V A 708 (manual gearbox), A 709 (automatic), 711 (Swiss automatic). It is the R25 of Dobermann.

At Alpine, the same 2,664 cc gets two Solex carburettors and a 10.1 compression ratio — the highest in the Library — for 150 bhp: that is the A310's type 112.7.30, a Renault-Alpine type number, not a Douvrin code.

Z7V
DOUVRIN CODE · 2,664 CC · K-JETRONIC INJECTION · 12 VALVES
2664
CC
144
BHP
12
VALVES
Identity

What makes a Z7V a Z7V

Figures read in the constructor's documents held in our Library — repair manuals, Pub et Trade data sheets, period bulletins. Nothing here comes from a web fact sheet.

Z7V 2,664 cc · mechanical injection · 12 valves · first generation Z7V sheet →
88 × 73
Bore × stroke 88 × 73 mm, 2,664 cc, compression ratio 9.2 — the index → vehicle table of the Z-engines manual.
Culasse
1.46 mm head gasket, like the Z7X; cylinder-head height 111.07 ± 0.15 mm. Valve springs: free length 47.2 mm, coil-bound at 30 mm.
Vilebrequin
Non-offset crankpins, and regrindable: crankpins 52.267 to 52.286 mm nominal, 51.967 to 51.986 repair size; main journals 70.043 to 70.062, repair 69.743 to 69.762.
Huile
Minimum pressure at 80 °C: 2.2 bar at 900 rpm and 4.4 bar at 4,000 rpm, with the Mot. 836-05 gauge.
112.7.30
The Alpine A310 2700 VA variant: 88 × 73, 10.1 compression ratio, 150 bhp DIN at 6,250 rpm and 20.8 m.daN at 3,500, two Solex carburettors (34 TBIA single-barrel, 35 CEEI twin-barrel), 6.5 litres of oil, about 152 kg dressed.
Known variants

Injection at Renault, carburettors at Alpine

Two documented variants of the first-generation 2.7 beyond the carburetted Z6V — the full code table is on the Engines page.

Z7V 144 to 150 bhp Every known code →
Z7V144 bhp
K-Jetronic injection12-valve
Renault 30 TX · phase 1 Renault 25 V6 injection (indices A 708, A 709 and 711 in model year 1986)
112-730150 bhp
Two Solex carburettors12-valve
Alpine A310 2700 VA — Renault-Alpine type 112.7.30, not a Douvrin code: the same 2,664 cc taken to a 10.1 compression ratio.
On the road

The cars of the Z7V

Renault 30 TX →

The 30 TX: the injected 144 bhp Z7V replaces the carburetted Z6V at the top of the range.

Renault 25 →

Phase 1 R25 V6 injection, 144 bhp — the car of Dobermann (1997). Its file details the five PRV codes it received.

Alpine A310 →

A310 2700 VA: type 112.7.30, 150 bhp, two carburettors — the October 1977 factory guide is in the Library.

In the workshop

What the documents say about the Z7V

Answers taken from our FAQ, each one read in the Library. The full FAQ holds several hundred more, engine code by engine code.

The Z7V, in the documents The full FAQ →
Millésime 1986
Did every 1986 Renault 25 V6 injection have the same engine?
No — three indices for one and the same B 298 body. Z7V A 708 for the manual gearbox, Z7V A 709 for the automatic, and Z7V 711 for the Swiss automatic. And the difference is not just a letter: the first two get the side-mounted air filter, the modified crankcase breathing circuit and idle regulation; the Z7V 711 has none of the three. In other words, on a 1986 R25 V6 injection the index tells you what equipment to look for under the bonnet — and there is no idle regulating valve to diagnose on a 711. N.T.1150 annexed to the M.R.249, its page 2 (page 69 of the PDF).
A310
What is the identity card of the Alpine A310 2700 VA's V6?
Type 112.7.30, six cylinders in V, 88 mm bore × 73 mm stroke, 2664 cc, compression ratio 10.1:1 — the highest in the Library — 150 hp DIN at 6250 rpm and 20.8 m.daN at 3500, 15 French fiscal horsepower. Fed by two Solex carburettors: a 34 TBIA single barrel and a 35 CEEI twin barrel. Idle 800 rpm. Oil capacity 6.5 litres (0.25 of it for the filter). Firing order 1-6-3-5-2-4, like every PRV. Two figures the web data sheets never give: the dressed engine weighs about 152 kg, and engine plus manual gearbox about 225 kg. The engine carries two identification plates — one riveted to the crankcase, the other glued to the timing cover — giving the type, the RNUR identity and the build number. Alpine A310 2700 VA repair guide, engine section, folio B-5a.
Vilebrequin
Can a PRV V6 crankshaft be reground?
It depends on the crankshaft. On non-offset crankpins — Z6W, Z7V, Z7W 702 — yes: rolled crankpins 52.267 to 52.286 mm nominal, 51.967 to 51.986 reground; main journals 70.043 to 70.062, reground 69.743 to 69.762. On OFFSET-pin crankshafts, those of the Z7U, Z7X and the Z7W other than 702, the manual does not allow it. And when regrinding a non-offset crank, the rolled finish must remain intact over 140° in the areas the manual marks. Z engines manual folio 10-35 · M.R.167 folio B-9.
Indices
How do you read a Z engine index, and which car does it belong to?
The manual gives the full index → vehicle table, with compression ratio, bore, stroke and capacity: Z7V 2,664 cc (88 × 73, CR 9.2) · Z7U 2,458 cc (91 × 63, CR 8.6 or 8) · Z6W and Z7W 2,849 cc (91 × 73, CR 9.5 or 8.8) · Z7X 2,975 and 2,963 cc (93 × 73 and 93 × 72.7, CR 7.6 or 9.6). On the engine, the type is read at A and the homologation letter at B. Z engines manual, folios 10-8 and 10-9.

In the Library

The documents of the 2.7 injection and its Alpine variant, searchable page by page: Pub et Trade sheet Z7V — Renault 25, 144 bhp · M.R.249 — Renault 25 V6 and unleaded fuel · A310 2700 VA factory guide — ignition · Pub et Trade sheet A310 2,664 cc · A310 2700 VA factory guide — engine · Z-engines repair manual

The rest of the family

Architecture, generations and every known engine code of the PRV V6 — on the main Engines page.

Z6V — the 2.7 carburettor →Z7W — the 2.8 litre → All PRV engines →