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3.5L 24v - VQ35HR
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3.5L 24v - VQ35HR
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Set of tri-metal crankshaft half shells for the four main bearings of the Nissan VQ35HR, VQ37VHR, VR30DDTT and VR38DETT V6 engines.
The VQ35HR (3.5 litre) and VQ37VHR (3.7 litre) are naturally aspirated Nissan V6 engines with twin overhead camshafts and 24 valves. The VR30DDTT (3.0 litre) and VR38DETT (3.8 litre) are twin-turbo V6 engines of the same layout. This page covers the VQ35HR, VQ37VHR, VR30DDTT and VR38DETT, fitted notably to the Nissan 350Z, 370Z, Skyline, Fuga, Z and GT-R, and to the Infiniti EX, FX, M, Q50 and Q60. All these engines share the same crankshaft journal and housing dimensions: a single ACL bearing set covers them.
The crankshaft of these engines runs on four main bearings. Each journal turns between two half shells, one seated in the block and the other in the main bearing cap: they carry the crankshaft. The ACL Race Series tri-metal set shown here replaces them on built engines.
A tri-metal bearing stacks three layers: a steel back, a copper-lead intermediate layer with high load capacity and an anti-friction running surface that protects the journal. The complete set covers the four main bearings of the crankshaft. The upper and lower half shells are different: each goes in its own position.
An aluminium bi-metal takes around 8,000 psi, a performance tri-metal up to 12,000 psi, 50% more. Hence better resistance and better durability on turbocharged, supercharged and high-revving engines.
| ACL bearings Crankshaft journal Ø 64.951 / 64.975 mm Housing bore Ø 69.993 / 70.017 mm Width 20 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 4M2505H-STD | ACL Race - Untreated | Standard | 2.516 |
| 4M2505HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 2.5035 |
| 4M2505H-.025 | ACL Race - Untreated | +0.025 | |
| 4M2505H-.25 | ACL Race - Untreated | +0.25 |
The running clearance is the gap between the bearing and the journal where the oil film flows.
In operation, the crankshaft journal does not rub against the bearing: it rides on this oil film, which carries the load. Clearance sets the thickness of this film: too tight, oil flows poorly, temperature rises and the risk of seizure increases; too loose, oil escapes, the film loses load-carrying capacity and oil pressure drops. The right clearance is the balance between adequate lubrication and a well-maintained oil film.
| Size / grade | When to choose it | ACL Race Series |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.065 to 0.078 mm |
| Increased clearance (HX) | Wider clearance: high oil flow, high rpm | 0.090 to 0.103 mm |
| +0.025 mm | Polished journal | 0.065 to 0.078 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.065 to 0.078 mm |
Checking on assembly: lay a calibrated strip (Plastigauge) on the journal, torque the main cap to spec, then compare the crushed strip against the gauge to read the clearance.
The ACL main bearings shown here are trimetal bearings, designed for engine building and racing. Compared with an original bearing, they handle far higher loads: they cope with increased power, high rpm or the addition of a turbo or supercharger, where a standard bearing quickly reaches its limit.
 | ACL Bearing Company, an Australian manufacturer of high-performance engine bearings since 1949, offers with its Race Series precise trimetal bearings, available in many sizes and proven on built engines worldwide. |
This main bearing set fits the Nissan V6 engines (engine codes VQ35HR, VQ37VHR, VR30DDTT and VR38DETT) of the following vehicles:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Infiniti | EX | VQ35HR, VQ37VHR | 300–329 hp | 2007– |
| Infiniti | FX | VQ35HR, VQ37VHR | 279–351 hp | 2008– |
| Infiniti | G Saloon | VQ35HR, VQ37VHR | 310–351 hp | 2007– |
| Infiniti | G Coupe | VQ37VHR | 320–354 hp | 2007– |
| Infiniti | G Convertible | VQ37VHR | 320–354 hp | 2010– |
| Infiniti | M (Y51) | VQ35HR, VQ37VHR | 320–364 hp | 2010– |
| Infiniti | M35 | VQ35HR | 307 hp | 2008–2010 |
| Infiniti | M37 | VQ37VHR | 330–334 hp | 2010– |
| Infiniti | Q40 Saloon | VQ37VHR | 333 hp | 2014– |
| Infiniti | Q50 | VQ35HR, VQ37VHR, VR30DDTT | 305–405 hp | 2013– |
| Infiniti | Q60 Coupe | VQ37VHR | 320–354 hp | 2013– |
| Infiniti | Q60 Coupe | VR30DDTT | 305–405 hp | 2016– |
| Infiniti | Q60 Convertible | VQ37VHR | 320–354 hp | 2013– |
| Infiniti | Q70 (Y51) | VQ35HR, VQ37VHR | 298–364 hp | 2013– |
| Infiniti | QX50 I | VQ37VHR | 320–351 hp | 2013– |
| Infiniti | QX70 | VQ35HR, VQ37VHR | 305–351 hp | 2013– |
| Mitsubishi | Proudia/dignity (BHGY5_, BY_5) | VQ35HR, VQ37VHR | 333–374 hp | 2012– |
| Mitsuoka | Galue Saloon | VQ35HR | 313 hp | 2008–2014 |
| Nissan | 350Z Coupe (Z33) | VQ35HR | 310–313 hp | 2005–2008 |
| Nissan | 350Z Roadster (Z33) | VQ35HR | 310–313 hp | 2005–2009 |
| Nissan | 370Z Coupe (Z34) | VQ37VHR | 328–355 hp | 2009– |
| Nissan | 370Z Roadster (Z34) | VQ37VHR | 328–337 hp | 2009– |
| Nissan | Cima (Y51) | VQ35HR | 374 hp | 2012– |
| Nissan | Fuga I (_Y50) | VQ35HR | 313 hp | 2007–2009 |
| Nissan | Fuga II (_Y51) | VQ35HR, VQ37VHR | 333–374 hp | 2009– |
| Nissan | Gt-r (R35) | VR38DETT | 480–608 hp | 2007– |
| Nissan | Skyline (V36) | VQ35HR, VQ37VHR | 316–330 hp | 2006–2014 |
| Nissan | Skyline (_V37) | VQ35HR, VR30DDTT | 305–374 hp | 2014– |
| Nissan | Skyline Coupe (V36) | VQ37VHR | 333 hp | 2007–2015 |
| Nissan | Skyline Crossover (_J50) | VQ37VHR | 330 hp | 2009– |
| Nissan | Z (Z34) | VR30DDTT | 383–420 hp | 2022– |
