SR20DEN

iTrader: (7)

Please don't discuss here. For reference only.



There are now six different sets of OEM VQ cams to hit US soil.

CVTC Off were applicable.

Engine: VQ30DE
Model Years: 1995-1999 (Maxima/ '96+ I30)

Intake__Lift: 8.55mm
Exhaust_Lift: 8.55mm

Intake__Duration: 232º
Exhaust_Duration: 232º

Intake_Opens: 3º BTDC
Intake_Closes: 49º ABDC

Exhaust_Opens: 49º BBDC
Exhaust_Closes: 3º ATDC

Overlap: 6º


-------------------------------------


Engine: VQ30DE (K)
Model Years: 2000-2001 (Maxima/I30)

Intake__Lift: 8.55mm
Exhaust_Lift: 9.0mm

Intake__Duration: 224º
Exhaust_Duration: 232º

Intake_Opens: 3º BTDC
Intake_Closes: 41º ABDC

Exhaust_Opens: 49º BBDC
Exhaust_Closes: 3º ATDC

Overlap: 6º

-------------------------------------


Engine: VQ35DE (1)
Model Years: 2001-2004 (Pathfinder)

Intake__Lift: 9.0mm
Exhaust_Lift: 9.0mm

Intake__Duration: 230º
Exhaust_Duration: 232º

Intake_Opens: 3º ATDC
Intake_Closes: 53º ABDC

Exhaust_Opens: 46º BBDC
Exhaust_Closes: 6º ATDC

Overlap: 3º

-------------------------------------


Engine: VQ35DE (2)
Model Years: 2002-2005 (Maxima, and a slew of others)
CVTC: Intake

Intake__Lift: 9.5mm
Exhaust_Lift: 9.5mm

Intake__Duration: 238º
Exhaust_Duration: 240º

Intake_Opens: 6º ATDC
Intake_Closes: 64º ABDC

Exhaust_Opens: 52º BBDC
Exhaust_Closes: 8º ATDC

Overlap: 2º

-------------------------------------


Engine: VQ35DE (3)
Model Years: 2005 (G35 Coupe, 35th Anniversary 350Z)
CVTC: Intake and Exhaust

Intake__Lift: 10.5mm
Exhaust_Lift: 10.5mm

Intake__Duration: 248º
Exhaust_Duration: 248º

Intake_Opens: 2º ATDC
Intake_Closes: 70º ABDC

Exhaust_Opens: 70º BBDC
Exhaust_Closes: 2º BTDC

Overlap: -4º

-------------------------------------


Engine: VQ40DE
Model Years: 2005 (Pathfinder, Frontier, Xterra)
CVTC: Intake

Intake__Lift: 10.0mm
Exhaust_Lift: 9.6mm

Intake__Duration: 240º
Exhaust_Duration: 244º

Intake_Opens: 4º ATDC
Intake_Closes: 64º ABDC

Exhaust_Opens: 56º BBDC
Exhaust_Closes: 6º ATDC

Overlap: 2º

-----------------------------------------------------

And here is the 2007 Altima cam data
Engine: VQ35DE
CVTC: Intake

Intake__Lift: 10.0mm
Exhaust_Lift: 10.0mm

Intake__Duration: 240º
Exhaust_Duration: 240º

Intake_Opens: 10º ATDC
Intake_Closes: 70º ABDC

Exhaust_Opens: 50º BBDC
Exhaust_Closes: 50º ATDC

Overlap: 0º

So it appears they've added 2º of duration to the intake cam and retarded it by 4º, advanced the exhaust cam by 2º and added 0.5mm of lift.

-------------------------------------------------

2007 VQ35HR

The VQ35HR has slightly different cam timings than the VQ35DE 'Revup'.

VQ35DE 'Revup' cam data

Engine: VQ35DE (3)
Model Years: 2005-2006 (G35mt, 35th Anniversary 350Z)
CVTC: Intake and Exhaust

Intake__Lift: 10.5mm
Exhaust_Lift: 10.5mm

Intake__Duration: 248º
Exhaust_Duration: 248º

Intake_Opens: 2º ATDC
Intake_Closes: 70º ABDC

Exhaust_Opens: 70º BBDC
Exhaust_Closes: 2º BTDC

Overlap: -4º
----------------

VQ35HR

Engine: VQ35DE
CVTC: Intake and Exhaust

Intake__Lift: 10.5mm
Exhaust_Lift: 10.5mm

Intake__Duration: 248º
Exhaust_Duration: 248º

Intake_Opens: 2º BTDC
Intake_Closes: 66º ABDC

Exhaust_Opens: 68º BBDC
Exhaust_Closes: 0º BTDC

Overlap: 2º

The intake cam has been advanced by 4º and the exhaust cam has been advanced by 2º.

The spark plug lised in the ESM is the Denso FXE22HR11

Same smaller valves as on the 2007 Altima.

Stiffer valve springs than the 'revup' engine. Strongest springs to date on any known production VQ engine. They might be the same as the Nismo springs.

113-127lbs @ 26.2mm (vs. 98-110lbs @26.2mm revup)

Once piece main cap/girdle/skirt with six bolt mains. Similar or same design as the VQ40DE.

Edited below.
Suspicions about longer rods aren't true. The VQ35HR has the SAME 144.2mm rod length as all other VQ35s. Unless the ESM is wrong. But this block is supposed to be taller. The difference might all be in the piston height.
However it does have 57mm journals vs. the old 55mm journals (without bearing).
54mm vs. 52mm Crank journals.
Main crank journals increased to 64mm, up from 60mm.
Main crank bearings thickened to 2.5mm up from 2.0mm.


EDIT: HAL is reporting that he had a HR rod physically checked to be 152.2mm. Which coinsides with the 8mm block height increase that's been reported by various sources.



edit 8-7-2009 by Nealoc187: compiled SR20DEN's 2007+ cam info into this thread and made sticky. Added Nismo Spec-1 and Spec-2 info.


VQ35DE Nismo Spec-1 and Spec-2 cam info from http://www.nismo.co.jp/en/products/c...ne/vq35de.html

Spec-1
1. Intake cam: Operating angle has been increased (238deg→276deg), as has cam lift (9.5mm→11.0mm) and the central angle (125deg→138deg)
2. Exhaust cam Operating angle has been increased (240deg→256deg), as has cam lift (9.5mm→10.5mm) and the central angle (112deg→120deg)
3. During VTC operation (crank angle at 50deg), the overlap at VTC off is 8deg, 58deg at VTC on

Spec-2
1. Intake cam: Operating angle has been increased (238deg→284deg), as has cam lift (9.5mm→11.0mm) and the central angle (125deg→135deg)
2. Exhaust cam Operating angle has been increased (240deg→268deg), as has cam lift (9.5mm→10.5mm) and the central angle (112deg→115deg)
3. During VTC operation (crank angle at 35deg), the overlap at VTC off is 18deg, 53deg at VTC on


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Key:
ATDC (After Top Dead Center)
ABDC (After Bottom Dead Center)
BTDC (Before Top Dead Center)
BBDC (Before Bottom Dead Center)