Volvo B8444S
4.4 L · V8 · naturally aspirated · petrol · 2005–present
Also known as: b8444s, b8444, 4.4 v8 volvo, yamaha v8, xc90 v8
Volvo's 4.4 V8 — in the XC90 and S80.
⚑ It was designed and built by Yamaha, which is the single most useful fact about it: it is not a Volvo engine in any sense that helps, and Volvo experience, Volvo parts logic and Volvo forum results all mislead. It is also unusually narrow — 60° rather than 90° — because it had to fit transversely in a car designed around a straight six.
That packaging is most of the ownership story. Everything is difficult to reach, the rear bank is against the bulkhead, and jobs that are routine on a longitudinal V8 are body-off work here.
Its known items are the variable valve timing units and the PCV system, both oil-condition dependent. A rough idle, a cam-timing code or oil in the intake is an oil-history question first — the ventilation system blocks and then pressurises the crankcase, which pushes oil past the seals.
Parts are scarce and specific, and that is usually what decides whether a fault is worth chasing on a car of this value.
Cars fitted with this engine
2 generations, across 1 make. From the authored catalogue — an absent car means the catalogue has not reached it, not that the engine was never fitted.
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Posted about this engine
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Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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