Nissan Skyline Engine ReplacementRebuilt & Performance Options Available

Nissan Skyline engine replacement costs vary significantly by engine code: RB20DET £1,500-£2,500 used, RB25DET £2,000-£6,000, RB26DETT £5,000-£25,000 depending on condition and build specification.

• RB20DET (GTS-t): £1,500-£2,500 used, £2,500-£4,000 rebuilt
• RB25DET (GT-T): £2,000-£4,000 used, £4,000-£6,000 rebuilt
• RB26DETT (GT-R): £5,000-£10,000 used, £10,000-£25,000 rebuilt/forged
• VQ35HR (350GT): £2,500-£5,500 rebuilt typical range
• VR38DETT (R35 GT-R): £15,000-£25,000 rebuilt due to hand-built nature

The RB26DETT is robust when maintained but has known weaknesses: oil pump drive failure on early R32/R33 units and ceramic turbo wheel failure if boost exceeds 1.0 bar.

• Oil pump drive collar fix essential for early R32/R33 GT-Rs
• Factory ceramic turbos fail if boost increased beyond stock levels
• Timing belt must be replaced every 100,000km (interference engine)
• Strong bottom end supports ~600bhp on good tune with proper maintenance
• Forged internals recommended for serious performance builds

RB25DET misfire under load is most commonly caused by crank angle sensor (CAS) failure, followed by coil pack issues or boost leaks affecting air/fuel ratio.

• CAS failure causes timing errors manifesting as misfire at 2500-3500rpm
• Individual coil packs fail causing cylinder-specific misfire
• Boost leaks or MAF sensor issues can mimic CAS failure symptoms
• Oil pressure sensor failure may give false low readings causing unnecessary concern
• OEM or upgraded aftermarket CAS units recommended for replacement

RB26DETT swaps into non-GT-R Skylines are possible but require significant custom work including ECU, wiring harness, transmission and cooling system modifications.

• Engine mounts, transmission tunnel and exhaust require modification
• ATTESA E-TS AWD system integration is complex and costly
• ECU and wiring harness must be adapted or replaced with standalone management
• Cooling system upgrades essential due to RB26's higher heat output
• Professional JDM specialist fitting strongly recommended for safety and reliability

A properly rebuilt Nissan Skyline engine with upgraded components addressing known failure points can last 100,000+ miles with regular maintenance and appropriate use.

• Rebuilt RB25DET with new CAS/coils typically lasts 80k-120k miles
• RB26DETT with crank collar fix and steel turbos supports high-mileage reliability
• VQ35HR with updated gallery gaskets and throttle body service extends lifespan
• Regular oil changes with correct specification critical for longevity
• Forged builds support higher power but require more frequent maintenance

The RB25DET NEO features variable valve timing (VVT), stronger connecting rods, improved oil pump design and 276bhp output versus the non-NEO's 250bhp and simpler design.

• NEO variant exclusive to R34 GT-T and 25GT Turbo models
• VVT system improves low-end torque and high-RPM power delivery
• Stronger bottom end supports higher power outputs safely
• NEO oil pump design more robust than earlier RB25 units
• NEO commands premium pricing due to performance advantages

VQ35HR misfire at 3000-3200rpm on light throttle is typically caused by throttle body carbon buildup or MAF sensor contamination creating a lean condition.

• Carbon buildup in throttle body disrupts airflow at part-throttle
• Dirty MAF sensor sends incorrect air mass data to ECU
• VVT solenoid issues can contribute to timing-related misfire
• ECU adaptation reset often required after cleaning components
• Professional tuning can resolve persistent misfire after mechanical fixes

Rebuilding is worthwhile for GT-R models and clean-chassis GT-T cars due to high values; used engines suit budget GTS-t or high-mileage GT-T replacements.

• GT-R (R32/R33/R34) values justify rebuilt/forged investment
• GT-T with clean chassis benefits from rebuilt RB25DET with warranty
• GTS-t or rust-affected cars may not justify rebuild costs
• Used engines require compression/oil pressure verification before purchase
• Forged builds hold value well for performance-focused owners

Reconditioned and rebuilt Nissan Skyline engines typically include 6-12 months unlimited mileage warranty; used engines usually carry 3-6 months coverage.

• 12-month warranty standard on professionally rebuilt units
• Used/breaker engines typically offer 3-6 months limited coverage
• Extended warranty available for forged performance builds
• Warranty terms vary by supplier - always confirm exact coverage
• Supply & fit installations may include additional labour warranty

The engine code is stamped on the block near the bellhousing; RB20DET, RB25DET, RB26DETT, VQ35HR and VR38DETT are the primary Skyline codes.

• Locate stamp on engine block near transmission bellhousing
• Check VIN plate for model code correlating to engine type
• R32/R33/R34: RB20DET (GTS-t), RB25DET (GT-T), RB26DETT (GT-R)
• V35/V36: VQ35DE/HR (350GT); R35: VR38DETT (GT-R only)
• Enter registration on EngineMarket for instant DVLA-verified identification