The ultimate VH FAQ

Discuss topics related to the VH41DE, VH45DE, VK45DE, and VK56DE engines.
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elwesso
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Forged pistons

Assorted good information

VH45 in a skyline

Nitrous and VH45DE

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Raxephon
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elwesso wrote:Supercharged VH45DE in a skyline
All the pics on page 1 are red X's


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elwesso
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Raxephon
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Thats an interesting link. He went the opposite way my father was suggesting, (ie,.. RB series motor in my Q45)

Any detailed threads involving the hydraulic lash adjusters?(I searched & came up with no results)

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elwesso
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anlasak wrote:Thats an interesting link. He went the opposite way my father was suggesting, (ie,.. RB series motor in my Q45)

Any detailed threads involving the hydraulic lash adjusters?(I searched & came up with no results)
The question remains... Why woudl you put an RB in the Q? that seems pretty stupid to me... UNLESS of COURSE you were talking with the ATESSA...

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Raxephon
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elwesso wrote:UNLESS of COURSE you were talking with the ATESSA...
I was

But I didn't want to have to scrounge around for the rear end sensors/wiring/etc, that would've been needed to make it work properly.Not to mention the other little things here & there.

Also if something goes bad on my VH45DE I can find it online or at a local junkyard.I haven't seen an RB series motors in any junkyards lately.

Besides, I'm happy with my VH45DE.

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elwesso
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Ive always thought it would be cool to make an AWD Q.. relaly that would be the only reason I would put the RB motor in the Q.. If oyu were sticking with RWD, pretty stupid to go to an RB.

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Raxephon
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elwesso wrote:Ive always thought it would be cool to make an AWD Q.. relaly that would be the only reason I would put the RB motor in the Q.. If oyu were sticking with RWD, pretty stupid to go to an RB.
I like the idea of an AWD Q45 as well, but only if its a manual & I have one.

I wouldn't consider dropping in an RB series motor to be "stupid", merely impractical.Stupid would be dropping in a SR20DE ( I wouldn't mind a 6-speed Gertrag though )

*EDIT* *Corrections made, see below*
Modified by anlasak at 9:38 PM 11/18/2005

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PoorManQ45
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elwesso wrote: If oyu were sticking with RWD, pretty stupid to go to an RB.
Nah, it makes perfect sense. Even though replacement parts are harder to find, it's still cheaper to maintain an Mod an RB then it is to do the same to a VH45.

THe RB can make plenty of torque if that's what you're "worried" about

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elwesso
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PoorManQ45 wrote:Nah, it makes perfect sense. Even though replacement parts are harder to find, it's still cheaper to maintain an Mod an RB then it is to do the same to a VH45.
Depends who you talk to!!

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Raxephon
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I take back my previous statement concerning the HLA's on a '92 SR20DE being the same ones in the '91 VH45DE.

The measurements are the same, but the opening in the tops, (of the HLA's), are larger for the SR20DE.

Also, HLA's on the VH45DE have a seal of sorts, towards the top of the main body.

Now, does anyone know if these seals can be replaced?They seem to be a hard plastic of sorts.(Mine crumbled on contact )
Modified by anlasak at 9:51 PM 11/18/2005

chinaonnitrous
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Motion to sticky please.

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Raxephon
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chinaonnitrous wrote:Motion to sticky please.

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elwesso
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chinaonnitrous wrote:Motion to sticky please.
Nope... I dont believe in many many stickies.. I have it bookmarked so if anyone needs it we can get it easily.. Besides, im gonna make an ULTIMATE Q45 thread so it would link to many other threads.

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An ultimate one would be awesome.

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Raxephon
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Probably been posted before but I thought this might be a little relevant.

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PoorManQ45
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Yep, posted before, but completely relevant.


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elwesso
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Thread stickied, and i changed it to include the VH41 in addition to the 45.

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I need the difference between VH and VK rods. Length, size of end journals, etc.


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Raxephon
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slownslurious wrote:I need the difference between VH and VK rods. Length, size of end journals, etc.
Is this of any help?

slownslurious
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I mean the vk41de... off the later Q's... dont' they have slighly longer rods but the same crank journal diameter? thats what I need.

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Raxephon
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'89-'93 VH45DE Ring Gear fits perfectly on the N/A 300zx flywheel.

The ring gear just has to be heated to expand the metal enough to increase the inner diameter by 1.5 millimeters.

I did mine in the oven @ 475 DEG for 1.5 hours on the lowest rack.(It has to be heated evenly)

Ring gear thickness's are different so you have to be careful when installing the q45 ring gear as it is not as thick as the 300zx and it must be flush with the back of the fly wheel. (If you are using the VH starter and bellhousing)

Removal of the old 300zx ring gear is simply a matter of surgery with a dremel and a reinforced cutting disc.

I measured the thickness of the welds on the VH ring gear and ground off just enough to fill the gap left from the thicker 300zx ring gear.

slownslurious
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slownslurious wrote:I mean the vk41de... off the later Q's... dont' they have slighly longer rods but the same crank journal diameter? thats what I need.
since this is the faq I should add here that I have since learned that the 45 and 41 rods are the same length.

If that helps anyone.

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Raxephon
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Also wanted to add that SR20DET RWD Flywheel-to-Crankshaft bolts fit perfectly in the VH45DE Crank.


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twoeightythreez
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Low resistance fuel inj=3-5 ohms high resistance fuel inj =12-15 ohmsYou're thinking in terms of gearing, dude cool thread anyway though

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i think that since this is the ultimate vh faq it should say which vehicles were equipped with the vh45/41de engines. also, because this seems to be a global subforum, where these vehicles are readily available.

obviously, the usdm 90-96 infiniti q45 was equipped with the vh45de.

others?

leonphelpss11
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I'm interested in throwing a vh45de into a s13. My question is, I heard that some vh's were made of cast iron and others were made of aluminum? Is this true? If it is, which ones were made with iron and others with aluminum. Thanks

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elwesso
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DeXteR wrote:i think that since this is the ultimate vh faq it should say which vehicles were equipped with the vh45/41de engines. also, because this seems to be a global subforum, where these vehicles are readily available.

obviously, the usdm 90-96 infiniti q45 was equipped with the vh45de.

others?
You dont want a 96 VH45DE. It didnt have VVT, used OBDII and is overall not a good thing to use, unless of course youre going with something wild, like a carburetor setup or something where using EFI and VVT isnt a big deal.

Anyway, theres basically 3 VH motors.

VH45DEUS VH41DEJDM VH41DE

The VH45DE was the same in the following cars.90-95 Infiniti Q4589-01 Nissan President

The US VH41, which I'll call UVH41DE is not a motor you want. Its ALMOST different enough to be a different motor than a VH. Apparently, it uses weaker internals, less efficient intake and exhaust manifolds, not to mention using OBDII which is a pain to deal with. Overall they arent worth getting

The JDM VH41DE, which I'll call the JVH41 is basically the exact same motor as the VH45DE except with a shorter stroke (which I believe is from the crank). Similar exhaust manifolds, nearly identical plenum, but a slightly different accessory drive setup. On the VH45, the alternator is mounted sort of on the side on the bottom. On the JVH41, its mounted in a much nicer location (for swaps) right on top above the water pump. it also uses a duplex timing chain setup, whereas the VH45 uses a single one.

I dont know if in practice this timing chain difference matters but I thought I'd throw it out. VH45 timing chain setups are not considered weak so I almost consider it a level upgrade.... not really an upgrade, but something different, personal preference if you will..

The JVH41DE was not available in any US vehicles, but pretty much any Y32 or Y33 chassis car you can get a JVH41 in. This includes, but not limited to, the cima, gloria, J.Ferie, and so on. Its important to note that VH41's were offered with AWD, so if someone wanted to do an AWD VH swap thatd be the place to go, however those cars are pretty rare.

in my opinion, the "ultimate" VH swap would be a JVH41 with VH45 internals (which swaps directly over). Not sure if its worth going to all that trouble, but thats my opinion.

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elwesso
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leonphelpss11 wrote:I'm interested in throwing a vh45de into a s13. My question is, I heard that some vh's were made of cast iron and others were made of aluminum? Is this true? If it is, which ones were made with iron and others with aluminum. Thanks
435254243527982% NOT TRUE. No "contemporary" Nissan V8 is made of iron.

you must be thinking about Z32/Skyline brake calipers...

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Thanks for the quick reply. Quick questions though, how much power do you think the vh45de's can hold on stock internals? I also read about how weak the timing chain or something along the lines of that is. Is it a must to replace? How much does a new/better one cost?


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