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Author Topic: Vq/vg Option Swaps Only  (Read 30485 times)

Offline nismologist

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Vq/vg Option Swaps Only
« Reply #60 on: 02:25:14 PM / 29-Dec-08 »
hell yeah.im going to try and reproduce the v6 rally car.

YOU THOUGHT SO, BUT I KNOW SO.
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Offline EightySix200SX

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« Reply #61 on: 02:34:42 PM / 03-Feb-09 »
i was on ur blog dude. shit u were in hollywood. i club up there alot with mah bois at the avalon dude. we coulda met up. anyway im prolly gonna roll up north with hung dude. so when the time comes ill prolly meet. anyway i didnt want shit, just 2 say whats up. oh by the way killer pics dude! keep it up.

p.s that cat pic is sweet dude...............
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Offline nismologist

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« Reply #62 on: 06:54:11 PM / 03-Feb-09 »
i wasnt in hollywood?

YOU THOUGHT SO, BUT I KNOW SO.
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Offline Wolf Dilworth

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« Reply #63 on: 02:17:15 AM / 28-Apr-10 »
Quote from: brewster240
vg34 was not a typo, thats why i typed it twice.
its a 33 bored out with 45 pistons.

there used to be a great article on one built for a pathfinder, but the site is down.

Yeah I was going to do the VG-34E for my 510 project till I settled on the VG-30DE.

The -33E block has more meat around the cylinders so you can bore over far enough to get the Q45 pistons in.  Basically you use the block and heads from a VG-33E and crank from the -30E... Here is a spliced e-mail I made several years back.  It may be a little hard to follow but it gives you the figures (recipe) for the -34E.

VG30 block displacement increase query
Date: Fri, 1 Nov 2002 02:17:35 -0800

OK here's my situation,
    I need to send my VG block to the machine shop.  I was thinking while my engine was apart, if there's any way to increase the power? Displacement increase, bore, stroke, compression ratio increase?  If so, what pistons should I use (p/n if you have it) How much can I safely overbore a VG, are there any cranks I can use for a “Stroker” motor? other suggestions?
I'm already porting the heads and I'm using a .430"/264 camshaft. Thanks again...

-Troy "power hungry" Siahaan


Troy, Tom, and list,
    VGs are very much like L-series in that you can mix and match lots of parts.  ALL North American VG’s have the same stroke and they all have the same size bearing journals.  The VG30E block cannot be bored to use VG33 pistons, the cylinder walls are too thin. The magic formula to build a VG34 is this: Bore a VG33 block .060 over. Use *stock* 1995 Infiniti Q45 pistons, rings, and wrist pins. Use VG30ET rods with custom, larger I.D. small end bushings as the Q45 wrist pins are 1mm larger. You can use any SOHC VG crank (they are ALL cast), but there are differences in front snouts and related accessories so use one you've got all the parts for. Avoid any SOHC VG crank that's been run with a serpentine accessory belt as these tend to break off the crank snout! The above VG34 combination is the one used in the off road trucks. If I remember right this bottom end comes out to 10.5:1 compression, perfect for a street motor. Sly said a VG34 with "good" cams and stock heads will make 250hp on 93 octane in street-trim. With port work and the "right" cams and intake a VG34 can make 300hp on pump gas. Sly says that no matter what you do they won't make power over 6500rpm as the displacement is too big for the head design. The question I've never heard answered is what happens when you turbo a VG34? I don't know anyone that's done it so I don't know what the limit is. I'm guessing the crank will come apart first. I've been told by many that SOHC VG cranks are short lived when 350hp is exceeded. It is possible to use the forged DOHC crank in a SOHC block but it requires a custom flywheel and messing around with a few things to make it go together. It's relatively painless but I've only done one so far. If you are thinking about building any VG be warned that they are difficult and expensive just to rebuild stock. Many automotive machine shops cannot hold the tolerances necessary to make a VG live, especially if it's warmed-over. Rebuild parts are also expensive, but then they should last 200k miles.

-David Carroll,
Experimental Engineering, www.vg30.com


    In my case, I started with the VG33 block (vintage 97).  It was bore 0.060 over not because it needed it but because I planned to pump up the CR and new JE pistons where going to be ordered anyhow.  So why not grab another 100cc's. So now it is 3.4 liters (roughly).  The stroke and rod length between the VG30 and VG33 was working from were alike.  The reason I mention this is because the only difference between my two blocks was bore.  So, using rough calculations, you would have to punch the VG30 0.180" to get the 3.3 liter displacement.  Once you got there you could use VG33 pistons.  However, the ones that came in my VG33 were dished and the VG30 pistons were "near" flat tops so CR could be a problem.  But here again, if you’re going to pay for the machining, and have to run out to the junkyard to get the VG33 pistons, why not just get the VG33 short block and bolt your modified heads to it?  At the same time I have seen conflicting reports on the interchangeability of the VG30 and VG33 heads (back and forth).  There are some subtle water jacket passages when I last inspected them side by side, the real question here which I haven't answered is; how much meat you have to work with in the VG30 block.  I would call the Nissan Motor-Sports guys and see if they can provide you the data.  Sly is the best guy to talk to.  But once you know the limit you will likely have to buy custom pistons.

-Tom


   Well vg33 were also in 96+ Pathifinders, Frontiers/Xterras and 97+ Quest got them.  As far as the VG34 hybrid….for an extra 100cc I don’t think it’s worth it at all other than to say you have it. If you plan on raising the compression ratio then it makes sense, but pump gas isn’t getting any better in some places so that’s another factor to think about.  9:1 is fine for street use, hell I’m running a VG30 in my car and it put 191hp to the rear wheels, with headers, cam gears and pathfinder intake…..all on a motor with 330,00kms and 9:1 compression. Add 10% for the VG33 and a gain of around 15-20hp and your up to 210-ish to the wheels…..cams, port/polish, balance/blueprint, ECU tuning and 300hp is a real possibility. All that work for 100cc seems like a waste when you can invest that better elsewhere.

"Denis"




Offline Xano

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« Reply #64 on: 04:07:37 AM / 28-Apr-10 »
dead thread ftl   over a year old!  its ok though, I forgive you.
~xano


Offline Maxpow

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« Reply #65 on: 05:36:07 AM / 28-Apr-10 »
Quote from: Xano
dead thread ftl   over a year old!  its ok though, I forgive you.


But now when someone thinks about posting another "lawl I am gunna swap(but not really cause I know nothing about cars)" thread they will see this and get some knowledge.
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Offline a tin pan alley

Vq/vg Option Swaps Only
« Reply #66 on: 07:41:24 AM / 28-Apr-10 »
no they won't. they'll just post what they were going to anyway. ha

Offline Wolf Dilworth

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« Reply #67 on: 06:23:07 PM / 28-Apr-10 »
Quote from: nismologist
looking to swap motors again.new v6 type.vq35 to be exact.but im open to any suggestions on v6 nissan engines.

Well, here is a VQ-35 in a Dime.

If that can be done... How much money and time do you have.  

Money being to the inverse of time.



Peace, Wolf

Offline jphillips

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« Reply #68 on: 01:50:55 PM / 30-Jul-10 »
holy necrothread batman!

Quote
lol weve got a vq35de and 6spd tranny sitting in my buddys garage..... no harness though just motor and tranny
still have?  I need!  already have the 6speed, just need the longblock.  B15 needs a beefy mill.  

That dime is lustworthy
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Offline bluke1

Re: Vq/vg Option Swaps Only
« Reply #69 on: 11:51:01 PM / 14-May-11 »
yes, i am intentionally dragging this old post out because it contains info. i found in my search. i plan to put a fresh vg into my se in the near future. i read recently that if you bore out a vg30e to fit the vg33 pistons that the wall thickness was the same as a stock vg33e. this post contradicts that. i want to overbore by 0.040 with higher compression but if the vg33 pistons fit then why not? my budget is not an issue. i do not intend to build  a high strung race motor, just want to squeak out a little more power that can run on pump gas. turbo is not an option on my se, as i want to keep it close to stock. i have other s12s that might wind up with boost. so does anyone have other references or even better, personal experience with the vg33  pistons?
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Offline BoostedVG

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Re: Vq/vg Option Swaps Only
« Reply #70 on: 08:41:57 AM / 04-Oct-11 »
 z31performance.com Yes terribly old post I'm dragging out due to boredom 
« Last Edit: 08:45:48 AM / 04-Oct-11 by BoostedVG »


Anyone interested in turbocharging their vg? Shoot me a PM. Buck Ofama