I'm creating this thread to document cylinder head information. I will link to it in the "useful threads" sticky.

If you have useful information, please post. Extraneous stuff will be deleted.

From a post SR20DEN made:

I have been waiting for a good opportunity to realease this information and this appears to be it. The VK45 titanium valves are near identical to the VQ30 valves. The only thing that is different is the total length which can be adjusted with new shims.

VQ30DE Steel valve;
Face In: 36.0 - 36.3mm
Face Ex: 31.2 - 31.5mm

Stem In: 5.965 - 5.980mm
Stem Ex: 5.945 - 5.960mm

Length In: 97.32 - 97.82mm
Length Ex: 94.85 - 95.35mm

Valve seat angle 45º15' - 45º45'

VK45 Titanium valve;
Face In: 36.0 - 36.3mm
Face Ex: 31.2 - 31.5mm

Stem In: 5.972 - 5.980mm
Stem Ex: 5.962 - 5.970mm

Length In: 96.57mm
Length Ex: 94.50mm


Valve seat angle 45º15' - 45º45'

The faces and the seat angles are identical. The stems are slightly different only because the expansion rates are slightly different between the metals. They're both classified as 6mm stems.

The only question that remains is the location of the keeper. If it's high enough on the Ti valve then there is no problem. If it's too low then custom retainers will be needed to make them work.

SR20DEN:

VQ35 bucket:
Dia: 33.97mm
Height: 21.00mm
mass: ??


VQ30 Bucket
dia: 34.95mm
height: 26.03mm (no shim)
mass: ??

VQ30 shim:
mass: ??

SR20DEN:

All in grams
VQ35;
Intake Valve: 59.535
Exhaust Valve: 47.785
Retainer: 4.76
Lifters: 29.711-30.476

VQ30;
Intake Valve: 52.618
Exhaust Valve: 46.494
Retainer: 8.789
Lifters: 26.337
Shims: 15.706-15.819

Everything is listed except for the keepers/locks which should be identical.

Totals and differences (minus keepers)
VQ35 Intake 94.774
VQ30 Intake 103.563
Difference 8.789 (same as an entire VQ30 retainer)

VQ35 Exhaust 81.024
VQ30 Exhaust 97.439
Difference 16.415 (about the same as removing an entire VQ30 shim)



Same post in ounces

All in ounces
VQ35;
Intake Valve: 2.1
Exhaust Valve: 1.615
Retainer: 0.168
Lifters: 1.048-1.075

VQ30;
Intake Valve: 1.856
Exhaust Valve: 1.64
Retainer: 0.31
Lifters: 0.929
Shims: 0.554-0.558

Everything is listed except for the keepers/locks which should be identical.

Totals and differences (minus keepers)
VQ35 Intake 3.343
VQ30 Intake 3.653
Difference 0.31 (same as an entire VQ30 retainer)

VQ35 Exhaust 2.858
VQ30 Exhaust 3.437
Difference 0.579 (about the same as removing an entire VQ30 shim)

SR20DEN:

VQ30DE Cams:

Pending


VQ30DE-K Cams:

Int: 8.55mm lift (gross)
Ex: 9.0mm lift (gross)

VQ35DE Cams:
Int: 9.5mm lift (gross)
Ex: 9.5mm lift (gross)

japmaxse:

JWT 3.0 cams:
256 duration
10.5mm lift (gross)

JWT 3.5 cams
260 duration
10.9mm lift (gross)

SR20DEN:

VQ35;

Swept: 583.0704
Total Chamber: 62.6957
CR: 10.3:1

Alternate
CR: 12.0:1
Total Chamber 53.0064


VQ30;
Swept: 497.9202
Total Chamber: 55.3245
CR: 10.0:1

VQ32:
Swept: 525.0499 (95.5x73.3)
+4.2978 chamber
CR: 8.8:1 (VQ35 heads, pistons, gasket)


VQ30DE with VQ35 heads/gasket
Swept: 497.9202
Total Chamber: 62.6957
CR: 8.94:1

NISMO

NISMO R Tune setup 262 degrees of duration .426" lift on the intake side
256 degrees duration on the exhaust side

NISMO's Spec 1 setup 276 degrees duration .433 " lift. The exhaust cam is 256 degrees duration with .413" of lift.

NISMO's Spec 2 cams are for the ultimate in top end power. 284 degrees of duration, and .433" lift on the intake side, exhaust cam features 268 degrees duration with .413" lift.

NISMO titanium valves weight INT (genuine 51.4g→NISMO 31.0g) EXH (genuine 46.8g→NISMO 28.7g).

Tomei
256 duration with 10.2 mm lift - offered in intake and exhaust cams
264 duration with 10.22 mm lift - offered in intake and exhaust cams
268 duration with 10.5 mm lift - offered in intake and exhaust cams

VQ30 FSM page with valve dimensions. Go to page EM-67:

http://members.dslextreme.com/users/...esm/a32-em.pdf

VQ35 cam specs:

http://forums.maxima.org/showthread....light=duration

Taken from the Nismo page

http://www.poweraxel.com/nismo/news/...4/n040037.html

< High lift camshaft (Spec-1) >
1. INT cam: Enlargement in operation angle (238deg→ 276deg),
カムリフト cUp (9.5mm→ 11.0mm), central angle (125deg→ 138deg)
2. EXH cam: Enlargement in operation angle (240deg→ 256deg),
カムリフト cUp (9.5mm→ 10.5mm), central angle (112deg→ 120deg)
3. VTC operation (the 50deg) when pointing in crank angle,
As for overlap with VTC off with 8deg and VTC on 58deg

< High lift camshaft (Spec-2) >
1. INT cam: Enlargement in operation angle (238deg→ 284deg), カムリフト cUp (9.5mm→ 11.0mm), central angle (125deg→ 135deg)
2. EXH cam: Enlargement in operation angle (240deg→ 268deg), カムリフト cUp (9.5mm→ 10.5mm), central angle (112deg→ 115deg)
3. VTC operation (the 35deg) when pointing in crank angle, as for overlap with VTC off with the 18deg and VTC on 53deg

has anyone tried swapping in the titanium VK valves and just re-shiming?

does anyone know what the vk45 bucket diameter is? also does anyone know of any oe buckets that are anywhere between 36 - 36.5mm OD that are a minimum of 21mm in height? i'm looking to put 2mm oversize buckets in my vq35, but i'd like to see if i can just use buckets from an existing car instead of getting them custom made. height doesn't matter i can machine it down to size as long as it's not shorter than stock. tia. also if anyone has specs on the vq40 buckets, i'd appreciate that too.

Umm... why??? That sounds about as usefull as putting nitrogen in your street tires.

it's for my twin turbo drag car. i'm getting cams w/ huge lift.

TILLEYS99:

VK45 intake 31.5g
VQ35 intake 60.0g

VK45 exhaust 28.9g
VQ35 exhaust 46.8g

Both valves are almost the same size (need new buckets too shim right) the intake is .5mm smaller in the VK but still seats.

Total valvetrain weight loss of 556.8g which is 1.227lbs

So, which springs would you use if you swapped the VQ35 valves with the VK45 valves? The VK springs, or is there something aftermarket?

VK and VQ30 springs are the same, so JWT VQ30 springs would work.

Pathfinder VQ35

weight of one bucket, shim and retainer: 48 grams.

Stephen,

as you mentioned earlier with VK45 intake valve size... it is: Face In: 36.0 - 36.3mm, but the VQ35 intake face has around 37.15mm though.... and that's just over 1mm larger... will we still be able to use VK45 valves on VQ35? Many people told me that with 1mm larger, it is no possible to fit VK45 valves into VQ35... has anyone tried this out yet? I know they can fit into nismo cylinder heads without a problem since those heads are machined from VQ30 heads..

I need to know it asap as I am building my N/A motor now and just bent an exhaust valve with Nismo high lift valve springs at 7600rpm... apparently those valve springs from nismo are not stronge enough either... btw, I am using Nismo Spec 1 cams and running 11.5:1 compression pistons on carrillo rods.. and tune with motec m600.

So I am looking into valvetrains now, it will be great if I can just use VK45 titanium items instead of Ferrea items... and is it true that the VQ35 intake valve weights 60 grams instead of 51 grams? (apparently on nismo website, it says the standard intake valve weights 51 grams)..

Oh... Ferrea valve weights are here for VQ35 (standard size):

Intake: 53 grams
Exhaust: 42 grams

cheers,

richie

Tilley put VK45DE valves in VQ35 heads, but it sounds like it wasn't easy.

Sorry, I was quoting information that Tilley had posted in another thread, for archiving purposes. He is the man to talk to.

So I guess going with Ferrea valve train will end up a lot cheaper and faster then...

Thanks for the helps!

richie