engine mods

Post by **Doomburger** » Wed Mar 22, 2006 5:55 pm

I wanna swap a vh45 with VK heads into my z31, but I can't find anybody that makes aftermarket parts for this engine. What do you guys do for performance? Cams, pistons, oversized parts, etc. ?

Post by **Raxephon** » Wed Mar 22, 2006 6:18 pm

Time to start doing some reading

Step#1: Start here--> zeroforum?id=177

Step#2: Scroll to the bottom, select "all" in "Date Range", Read until your eyes bleed

Step#3: Once the blood dries enough to see again,Go here--> zeroforum?id=24

Step#4: Repeat step #2

If you go by the abbreviated version, you'll miss out on a lot of good stuff, take your time and enjoy the wealth that is NICO.

Post by **elwesso** » Wed Mar 22, 2006 6:40 pm

Allow me to be the devils advocate: Why would you want to put VK45 heads on your VH45?

Post by **Raxephon** » Wed Mar 22, 2006 6:49 pm

elwesso wrote:Allow me to be the devils advocate: Why would you want to put VK45 heads on your VH45?

(Sorry, I've been dying to use that icon )

Post by **maxnix** » Thu Mar 23, 2006 3:28 am

elwesso wrote:Allow me to be the devils advocate: Why would you want to put VK45 heads on your VH45?

Especially since the camshaft drives are totally different.

Lack of research here.

Post by **Doomburger** » Thu Mar 23, 2006 8:55 am

Well,I heard that it's a mod that people are doing. supposedly that, combined with headers and a decent intake should produce close to 400bhp

Post by **elwesso** » Thu Mar 23, 2006 9:04 am

id like to see some more information about this...

Post by **RobertsnewQ** » Thu Mar 23, 2006 10:05 am

I heard this from a local race shop, too. THey said their engine builder built a VH45 block with VK56 heads for a land speed car.

I didn't believe it, but it's the second (and this is the third) time I've heard it.

Wish I had a VK head to play with...

Post by **maxnix** » Thu Mar 23, 2006 10:34 am

Compare valve area. But the VH45DE is larger.

VH45DE: Intake: 38mm Exhaust: 33mmVK45DE: Intake: 36mm Exhaust: 31.2mm

Intuitively, it seems silly to put a head designed for an open deck block on a closed deck block. Then there are the drive chain laybout.

Urban myth? Let's see the data.

Post by **Falkdesigns** » Thu Mar 23, 2006 11:29 am

I know in the land of Honda, it's very common to do head swaps, like a B16a head on a GSR bottom end. Totally different, but the same concept.

Post by **elwesso** » Thu Mar 23, 2006 12:48 pm

now VK56 head would be COMPLETELY different than a Vk45!

Post by **Q_SHIP** » Thu Mar 23, 2006 12:52 pm

Falkdesigns wrote:I know in the land of Honda, it's very common to do head swaps, like a B16a head on a GSR bottom end. Totally different, but the same concept.

Yeah, even the old Pontiac Big block guys used to do it. 400 heads on a 455.

Post by **defrag010** » Thu Mar 23, 2006 3:10 pm

or like bolting some 305 chevy heads on a 350 for higher compression....

Post by **Q45tech** » Thu Mar 23, 2006 3:44 pm

The last American V8 that had much in common with a Q45 [until the 90's] was the 1964-67..... 273 Dodge Dart GT V8 engine and that was in displacement only.

Heads don't swap in V8 Japanese engines [Toyota nor Nissan].

Post by **elwesso** » Thu Mar 23, 2006 3:56 pm

What about the northstar?

Post by **maxnix** » Fri Mar 24, 2006 5:15 am

elwesso wrote:now VK56 head would be COMPLETELY different than a Vk45!

Don't think so as a VK56 is just basically a stroked VK45. Why rpm peak drops so precipitously.

I would be real surprised if cooling passages matched between an open deck and closed deck design.

It's rather discouraging board non-Australian speedboating members don't recognize what an exceptional engine the VH series is, especially the VH45DE.

The American and Honda blocks are all basically the same design, with the same top mating surfaces. Ancient cam in blocks with pushhrods or OHC cam actuation via belts make adaptation easy compared to adapting chain driven camshafts of differing designs.
Modified by maxnix at 10:09 AM 4/11/2006

Post by **maxnix** » Fri Mar 24, 2006 5:25 am

elwesso wrote:What about the northstar?

What about it? Good attempt, but block is fragile compared to most German and Japanese designs.

Post by **Doomburger** » Fri Mar 24, 2006 6:36 am

alot of people on automotiveforums.com are talking about vk head swaps, but I don't think that website's very reliable.

Post by **elwesso** » Fri Mar 24, 2006 7:36 am

maxnix wrote:Don't think so as a VK56 is just basically a stroked VK45. Why rpm peak drops so precipitally.

I would be real surprised if cooling passages matched between an open deck and closed deck design.

It's rather discouraging board non-Australian speedboating members don't recognize what an exceptional engine the VH series is, especially the VH45DE.

The American and Honda blocks are all basically the same design, with the same top mating surfaces. Ancient cam in blocks with pushhrods or OHC cam actuation via belts make adaptation easy compared to adapting chain driven camshafts of differing designs.

I was just stating (not that I think its a good idea by any stretch of the imagination) that if you had to chose, the 56 would be the way to go... I agre with you though, why try and change a piece of engineering masterpiece with a thing that is much inferior!

The later northstars arent really "fragile" at all.. The redesign in 1998 and 2000 really helped any issues with the HG... other than that, its a strong engine... I sitll agree though, that it will not be able to handle increased power and RPM like the VH45 et.al.

Post by **Rex** » Fri Mar 24, 2006 9:13 am

Doomburger wrote:alot of people on automotiveforums.com are talking about vk head swaps, but I don't think that website's very reliable.

I wonder if all this "talk" is really about VK45 & VK56's not VH45 & VK56's?

Just a thought.

Post by **Doomburger** » Fri Mar 24, 2006 5:31 pm

That's what it's about, vh45's with vk series heads, I'm not quite sure weather it's vk45 or vk56 heads, but I'm pretty sure they're both the same.

Post by **one ton garage** » Sat Mar 25, 2006 3:47 pm

Even if such a head swap was possible, i can't help but think that the costs and time and effort involved in relation to the benefits gained would be minimal compared to just investing in some other add-on mods on a stock motor... even something as simple as NOS

Post by **sijoko** » Sun Mar 26, 2006 9:59 am

maxnix wrote:
Intuitively, it seems silly to put a head designed for an open deck block on a closed deck block.

Can anyone guess if this is an open-deck design or a closed-deck?

Post by **sijoko** » Sun Mar 26, 2006 10:05 am

An interesting note about the VK engines: They do not have hydraulic lifters such as on the VH45DE. They use shims to adjust for valve lash.

The VK45 doesn't rev as high as the VH45. So why the change?

Is there any good reason to get rid of the hydraulic lifters? Seems to me that Nissan is trying to save money again.

Post by **Q45tech** » Sun Mar 26, 2006 12:28 pm

http://www.planetsoarer.com/ca....html

SC/LS400 shims.............precision is the name of the game.

Post by **TgduMg** » Tue Apr 11, 2006 5:58 am

sijoko wrote:An interesting note about the VK engines: They do not have hydraulic lifters such as on the VH45DE. They use shims to adjust for valve lash.

The VK45 doesn't rev as high as the VH45. So why the change?

The VK45 has hollow camshafts

The VH45 camshafts are ?

Danisiti 1

engine mods

engine mods

Re: engine mods (Doomburger)

Re: engine mods (anlasak)

Re: engine mods (elwesso)

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Re: engine mods (maxnix)

Re: engine mods (Doomburger)

Re: engine mods (Doomburger)

Re: (Falkdesigns)

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Re: (defrag010)

Re: (Q45tech)

Re: (elwesso)

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Re: (maxnix)

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Re: (Doomburger)

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Re: engine mods (maxnix)

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