The Great Gearhead thread
The Great Gearhead thread
Starting with this very interesting information I have just found.
http://www.autosteel.org/pdfs/bar_ten_best_engines.pdf
Basically that document states that the VQ35 has forged pistons and sodium filled valves. Previously I thought our pistons were cast aluminum.
I just took the cylinder head off my old VQ35 last weekend and noticed that the #2 piston was completely unscathed. It was only an exhaust valve that had a hole burned through it.
It's time again to do part number references to see if the '04 Pistons and valves are the same as the '02s.
Oh yeah.. I am speaking of Maxima stuff of course.
http://www.autosteel.org/pdfs/bar_ten_best_engines.pdf
Basically that document states that the VQ35 has forged pistons and sodium filled valves. Previously I thought our pistons were cast aluminum.
I just took the cylinder head off my old VQ35 last weekend and noticed that the #2 piston was completely unscathed. It was only an exhaust valve that had a hole burned through it.
It's time again to do part number references to see if the '04 Pistons and valves are the same as the '02s.
Oh yeah.. I am speaking of Maxima stuff of course.
Donating Maxima.org Member
Joined: Apr 2001
Posts: 1,085
Originally Posted by SR20DEN
Starting with this very interesting information I have just found.
http://www.autosteel.org/pdfs/bar_ten_best_engines.pdf
Basically that document states that the VQ35 has forged pistons and sodium filled valves. Previously I thought our pistons were cast aluminum.
I just took the cylinder head off my old VQ35 last weekend and noticed that the #2 piston was completely unscathed. It was only an exhaust valve that had a hole burned through it.
It's time again to do part number references to see if the '04 Pistons and valves are the same as the '02s.
Oh yeah.. I am speaking of Maxima stuff of course.
http://www.autosteel.org/pdfs/bar_ten_best_engines.pdf
Basically that document states that the VQ35 has forged pistons and sodium filled valves. Previously I thought our pistons were cast aluminum.
I just took the cylinder head off my old VQ35 last weekend and noticed that the #2 piston was completely unscathed. It was only an exhaust valve that had a hole burned through it.
It's time again to do part number references to see if the '04 Pistons and valves are the same as the '02s.
Oh yeah.. I am speaking of Maxima stuff of course.
Now all you have left to do is fill us in on that little intake manifold secret of yours!
Originally Posted by MAXINXS
Now all you have left to do is fill us in on that little intake manifold secret of yours!
Dyno plot says I have the most area under the Administrator curve
Joined: Jul 2001
Posts: 7,064
Although installed in the Infinity vehicle
, this engine is basically the
Nissan unit that has been in the Wards top 10 list for the last nine years.
Nissan unit that has been in the Wards top 10 list for the last nine years.
The engine in the G35 Sedan produces 260 hp at
6,000 rpm and 260 lb./ft. of torque at 4,800 rpm.
In the G35 Coupe version, the engine generates
280 hp at 6,200 rpm and 270 lb./ft. of torque at
4,800 rpm. The expanded power range is
achieved as a result of reworking the intake port
design and adopting Continuously Variable
Valve Timing Control System (CVTCS)
technology.
6,000 rpm and 260 lb./ft. of torque at 4,800 rpm.
In the G35 Coupe version, the engine generates
280 hp at 6,200 rpm and 270 lb./ft. of torque at
4,800 rpm. The expanded power range is
achieved as a result of reworking the intake port
design and adopting Continuously Variable
Valve Timing Control System (CVTCS)
technology.
Nissan's VQ 3 Litre is the current benchmark for smoothness and power
with the 3.5 litre version set to continue this trend.
with the 3.5 litre version set to continue this trend.
This is a basic DOHC
motor which optimizes the term "attention to detail". All the major
internal engine parts are lightened and microfinished to reduce friction.
A computer continuously fine-tunes the opening of the intake valves to
feed the engine with more air at the exact moment for combustion.,
which optimizes engine performance at all engine speeds. The block has
coated steel liners to improve rigidity and reduce friction.
The crankshaft has been optimized for lightness and has been micro
finished to reduce friction.
The aluminium forged pistons are coated in molybdenum to further
reduce friction, while the steel forged connecting rods have been fully
lightened and balanced.
motor which optimizes the term "attention to detail". All the major
internal engine parts are lightened and microfinished to reduce friction.
A computer continuously fine-tunes the opening of the intake valves to
feed the engine with more air at the exact moment for combustion.,
which optimizes engine performance at all engine speeds. The block has
coated steel liners to improve rigidity and reduce friction.
The crankshaft has been optimized for lightness and has been micro
finished to reduce friction.
The aluminium forged pistons are coated in molybdenum to further
reduce friction, while the steel forged connecting rods have been fully
lightened and balanced.
The four valves per cylinder are steel
sodium filled units, with a single steel
return spring, located by a pressed steel
cap and collet.
sodium filled units, with a single steel
return spring, located by a pressed steel
cap and collet.
Each of the twin camshafts operate cast rockers that are attached to
hollow steel shafts that run the length of the head.
hollow steel shafts that run the length of the head.
The VQ uses mechanical direct acting bucket tappets. There are no rockers. The VE30DE used roller rockers from the 92-94SE's. But as far as I'm aware, all VQ engines use tappets for valve actuation. No rockers. Part of the design philosophy on the engines was to keep them as compact and simple as possible. Rockers take up space and add complexity.
These units are also
micro finished to provide less friction. A ribbed serpentine timing belt
operates the cams from the crank with plastic and alloy pulleys.
The flywheel is a lightened fully balanced steel unit.
micro finished to provide less friction. A ribbed serpentine timing belt
operates the cams from the crank with plastic and alloy pulleys.
The flywheel is a lightened fully balanced steel unit.
Timing CHAIN
BTW I took a look at the Honda J30A4 and that is filled with BS and inaccuracies also. They say the Accord Coupe is using i-VTEC and VCM (Variable Cylinder Management). Nope, it's still using SOHC VTEC and does not use VCM. It's their classic 2-step VVT system with a 4800-5000rpm crossover in this particular vehicle, is NOT continuously variable, and does NOT use cylinder deactivation. So unfortunately I would take what you read in this write-up like a grain of salt.
Dyno plot says I have the most area under the Administrator curve
Joined: Jul 2001
Posts: 7,064
Originally Posted by krismax
Is there a wards rundown on the 3.0?
Otherwise known as the VQ30DE.
$12 to purchase and download each, and definitely worth every penny if you're looking for solid technical information. I own that one, and a dozen or so more Nissan, Toyota, and Honda SAE papers. There's a dozen or so more that I've been meaning to buy, but just haven't had the time to get around to it. Too damn busy lately. There's one on Nissan's new 5.6L Endurance V8 that should be a good read also.
Originally Posted by SteVTEC
SAE 940991 : Development of a New-Generation Lightweight 3-Liter V6 Nissan Engine
Otherwise known as the VQ30DE.
$12 to purchase and download each, and definitely worth every penny if you're looking for solid technical information. I own that one, and a dozen or so more Nissan, Toyota, and Honda SAE papers. There's a dozen or so more that I've been meaning to buy, but just haven't had the time to get around to it. Too damn busy lately. There's one on Nissan's new 5.6L Endurance V8 that should be a good read also.
Otherwise known as the VQ30DE.
$12 to purchase and download each, and definitely worth every penny if you're looking for solid technical information. I own that one, and a dozen or so more Nissan, Toyota, and Honda SAE papers. There's a dozen or so more that I've been meaning to buy, but just haven't had the time to get around to it. Too damn busy lately. There's one on Nissan's new 5.6L Endurance V8 that should be a good read also.
The 5.6L Endurance is the sheiot. I love driving anything with that motor in it! Matter of fact, if they do not offer the HEMI in the 2005 Dodge Dakota, I'm getting a Nissan Titan. Anyways...
I read the VQ35 had sodium filled valves a while ago, and I read that all versions of the VQ35 had them (not just the Gen3 VQ35)...but I can't recall where I read this info. Might have been from another Nissan/Infiniti site. Anyway, I haven't confirmed this either...
I will verify the sodium filled rumor tomorrow when I cut open a valve. I don't believe the forged piston data either.
I also seem to have missed the crap where it said the VQ has rockers. That isn't even close. Steve we could send these di(kholes an email but no company that I ever attempt to correct ever responds to my emails.
I also seem to have missed the crap where it said the VQ has rockers.
That isn't even close. Steve we could send these di(kholes an email but no company that I ever attempt to correct ever responds to my emails.
Senior Member
Joined: Jan 2001
Posts: 1,816
I usually save this... but it seems just the occasion...
anyway i got REALLY suspicious when they said 'lightened flywheel'
I was like LIGHT MY A$$!!!
anyway i got REALLY suspicious when they said 'lightened flywheel'
I was like LIGHT MY A$$!!!
Originally Posted by SteVTEC
It's Infiniti
Okay it's the same engine family but there are a lot of differences between the VQ35DE (GenIII) and the GenI VQ30DE.
Yeah, and the extra 0.5L of displacement helps too.
The VQ35 is not as smooth, though.
No problems that I'm aware of here....
Never ever heard the sodium filled valve thing before. Maybe this is new on the GenIII VQ35DE's. I think they may have gotten this confused with the Suby EJ25 from the STi, but I could be wrong. If they're sodium filled in the VQ35, so much the better.
The VQ uses mechanical direct acting bucket tappets. There are no rockers. The VE30DE used roller rockers from the 92-94SE's. But as far as I'm aware, all VQ engines use tappets for valve actuation. No rockers. Part of the design philosophy on the engines was to keep them as compact and simple as possible. Rockers take up space and add complexity.
Timing CHAIN
BTW I took a look at the Honda J30A4 and that is filled with BS and inaccuracies also. They say the Accord Coupe is using i-VTEC and VCM (Variable Cylinder Management). Nope, it's still using SOHC VTEC and does not use VCM. It's their classic 2-step VVT system with a 4800-5000rpm crossover in this particular vehicle, is NOT continuously variable, and does NOT use cylinder deactivation. So unfortunately I would take what you read in this write-up like a grain of salt.
Okay it's the same engine family but there are a lot of differences between the VQ35DE (GenIII) and the GenI VQ30DE.
Yeah, and the extra 0.5L of displacement helps too.
The VQ35 is not as smooth, though.
No problems that I'm aware of here....
Never ever heard the sodium filled valve thing before. Maybe this is new on the GenIII VQ35DE's. I think they may have gotten this confused with the Suby EJ25 from the STi, but I could be wrong. If they're sodium filled in the VQ35, so much the better.
The VQ uses mechanical direct acting bucket tappets. There are no rockers. The VE30DE used roller rockers from the 92-94SE's. But as far as I'm aware, all VQ engines use tappets for valve actuation. No rockers. Part of the design philosophy on the engines was to keep them as compact and simple as possible. Rockers take up space and add complexity.
Timing CHAIN
BTW I took a look at the Honda J30A4 and that is filled with BS and inaccuracies also. They say the Accord Coupe is using i-VTEC and VCM (Variable Cylinder Management). Nope, it's still using SOHC VTEC and does not use VCM. It's their classic 2-step VVT system with a 4800-5000rpm crossover in this particular vehicle, is NOT continuously variable, and does NOT use cylinder deactivation. So unfortunately I would take what you read in this write-up like a grain of salt.
Originally Posted by 2k2whitemaxi
well spill it .. or are you going to sell this idea too??
-J
-J
Dyno plot says I have the most area under the Administrator curve
Joined: Jul 2001
Posts: 7,064
Originally Posted by SR20DEN
I just verified that we do NOT have sodium filled exhaust valves. I carefully cut one open to be sure. Where they're getting all of this bad information is beyond me.
Dyno plot says I have the most area under the Administrator curve
Joined: Jul 2001
Posts: 7,064
Originally Posted by FanaticMadMax
Interesting article. I have to read the rest of the other manufactures engines and what they have to say about it.
Originally Posted by SteVTEC
SAE 940991 : Development of a New-Generation Lightweight 3-Liter V6 Nissan Engine
Otherwise known as the VQ30DE.
$12 to purchase and download each, and definitely worth every penny if you're looking for solid technical information. I own that one, and a dozen or so more Nissan, Toyota, and Honda SAE papers. There's a dozen or so more that I've been meaning to buy, but just haven't had the time to get around to it. Too damn busy lately. There's one on Nissan's new 5.6L Endurance V8 that should be a good read also.
Otherwise known as the VQ30DE.
$12 to purchase and download each, and definitely worth every penny if you're looking for solid technical information. I own that one, and a dozen or so more Nissan, Toyota, and Honda SAE papers. There's a dozen or so more that I've been meaning to buy, but just haven't had the time to get around to it. Too damn busy lately. There's one on Nissan's new 5.6L Endurance V8 that should be a good read also.
Originally Posted by Chinkzilla
I usually save this... but it seems just the occasion...
anyway i got REALLY suspicious when they said 'lightened flywheel'
I was like LIGHT MY A$$!!!
anyway i got REALLY suspicious when they said 'lightened flywheel'
I was like LIGHT MY A$$!!!
VQ Cylinder heads
OK guys, Thanks to Dxit for sending me a VQ30DE-K head I now have tons of information comparing the two. I will just have to document everthing over the next couple of days but what I can say for sure already is that I wouldn't even consider putting the VQ30 heads on a VQ35 block or even a VQ33 stroker. You will never make any real NA power with these inferior heads unless you have some extensive work done to them. If you guys really want to make power then you need to use the VQ35 heads on your VQ30 blocks.
And at this point Im certain the VQ35 heads can be used with the VQ35 cams with no VTCs if you wish.
And on the flipside of that I am 99% certain (as of now) that the more agreesive VQ35 cams can be fitted onto the VQ30 heads so long as you lighten the valvetrain via VK45 Ti valves and retainers.
I will report the numbers as I get everything measured but I'll give you a short rundown for now.
VQ30 Intake ports: Smaller
VQ30 Intake valves: Smaller face
VQ30 Buckets/lifters: Wider, deeper, much heavier
VQ30 retainers: Heavier
VQ30 Cams: Less lift, less duration
The VQ30 has hydraulic lifters. And as far as I can determin the VQ35 has a solid lifter setup. There just isn't any type of cushioning device that can be called a lifter.
And at this point Im certain the VQ35 heads can be used with the VQ35 cams with no VTCs if you wish.
And on the flipside of that I am 99% certain (as of now) that the more agreesive VQ35 cams can be fitted onto the VQ30 heads so long as you lighten the valvetrain via VK45 Ti valves and retainers.
I will report the numbers as I get everything measured but I'll give you a short rundown for now.
VQ30 Intake ports: Smaller
VQ30 Intake valves: Smaller face
VQ30 Buckets/lifters: Wider, deeper, much heavier
VQ30 retainers: Heavier
VQ30 Cams: Less lift, less duration
The VQ30 has hydraulic lifters. And as far as I can determin the VQ35 has a solid lifter setup. There just isn't any type of cushioning device that can be called a lifter.
Originally Posted by SR20DEN
OK guys, Thanks to Dxit for sending me a VQ30DE-K head I now have tons of information comparing the two. I will just have to document everthing over the next couple of days but what I can say for sure already is that I wouldn't even consider putting the VQ30 heads on a VQ35 block or even a VQ33 stroker. You will never make any real NA power with these inferior heads unless you have some extensive work done to them. If you guys really want to make power then you need to use the VQ35 heads on your VQ30 blocks.
And at this point Im certain the VQ35 heads can be used with the VQ35 cams with no VTCs if you wish.
And on the flipside of that I am 99% certain (as of now) that the more agreesive VQ35 cams can be fitted onto the VQ30 heads so long as you lighten the valvetrain via VK45 Ti valves and retainers.
I will report the numbers as I get everything measured but I'll give you a short rundown for now.
VQ30 Intake ports: Smaller
VQ30 Intake valves: Smaller face
VQ30 Buckets/lifters: Wider, deeper, much heavier
VQ30 retainers: Heavier
VQ30 Cams: Less lift, less duration
The VQ30 has hydraulic lifters. And as far as I can determin the VQ35 has a solid lifter setup. There just isn't any type of cushioning device that can be called a lifter.
And at this point Im certain the VQ35 heads can be used with the VQ35 cams with no VTCs if you wish.
And on the flipside of that I am 99% certain (as of now) that the more agreesive VQ35 cams can be fitted onto the VQ30 heads so long as you lighten the valvetrain via VK45 Ti valves and retainers.
I will report the numbers as I get everything measured but I'll give you a short rundown for now.
VQ30 Intake ports: Smaller
VQ30 Intake valves: Smaller face
VQ30 Buckets/lifters: Wider, deeper, much heavier
VQ30 retainers: Heavier
VQ30 Cams: Less lift, less duration
The VQ30 has hydraulic lifters. And as far as I can determin the VQ35 has a solid lifter setup. There just isn't any type of cushioning device that can be called a lifter.
It will mostly benefit the FI cars because of the lower compression. Other than that I am certain thet your car will make plenty more power with the better flowing heads and more agressive cams. The low end is going to be crap though unless you get new software.
Originally Posted by BlackBIRDVQ
I wonder if the Nismo heads are any different
and if they will bolt up to a FWD engine ?
I'm ready for the 4.0L already.... once I get the info.
I'm still bussy pioneering the wheel.... err I mean the Maxima I'll let someone else pioneer that while I have my fun in the little 4 cylinder Nissan turbos- sideways My next car.... S13 hatch this week or so.
I'll let someone else pioneer that while I have my fun in the little 4 cylinder Nissan turbos- sideways My next car.... S13 hatch this week or so.
Originally Posted by SR20DEN
The VQ30 has hydraulic lifters. And as far as I can determin the VQ35 has a solid lifter setup. There just isn't any type of cushioning device that can be called a lifter.
There are no shims on the VQ35 bucket. If you need to re shim the valves you buy new buckets. They are solid and not anything like the VQ30 buckets that have oil film hydraulic shims.
Originally Posted by SR20DEN
There are no shims on the VQ35 bucket. If you need to re shim the valves you buy new buckets. They are solid and not anything like the VQ30 buckets that have oil film hydraulic shims.
How much better are the nismo heads over the VQ 35 stock?
It seems from what i read on the 350 z forum that you can get the nismo heads fully assembled with the 45's titanium valves and stuff. Do you think these would go on fine on a vq 30? And if so what would be the compression ratio and the power gain?
And i plann on getting the e-manage farly soon do you think that could solve high compression problems and the such?
Thanks
Chris
It seems from what i read on the 350 z forum that you can get the nismo heads fully assembled with the 45's titanium valves and stuff. Do you think these would go on fine on a vq 30? And if so what would be the compression ratio and the power gain?
And i plann on getting the e-manage farly soon do you think that could solve high compression problems and the such?
Thanks
Chris
There are few people who know the true answer to that question and none of them are talking specifics. Remember though that the Nismo heads aren't designed for use with the VTC which isn't good for 350Z or 5.5 gen Maxima owners. But I do think I can figure out how to solve this problem.
Originally Posted by SR20DEN
There are few people who know the true answer to that question and none of them are talking specifics. Remember though that the Nismo heads aren't designed for use with the VTC which isn't good for 350Z or 5.5 gen Maxima owners. But I do think I can figure out how to solve this problem.
VQ35 bucket:
Dia: 33.97mm
Height: 21.00mm
mass: ??
VQ30 Bucket
dia: 34.95mm
height: 26.03mm (no shim)
mass: ??
VQ30 shim:
mass: ??
I will add more to this post as i get the info.
Dia: 33.97mm
Height: 21.00mm
mass: ??
VQ30 Bucket
dia: 34.95mm
height: 26.03mm (no shim)
mass: ??
VQ30 shim:
mass: ??
I will add more to this post as i get the info.
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)
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)