JClaw

iTrader: (17)

Okay, make of this whatever you want, I've never heard of this particular idea before:

http://forums.nasioc.com/forums/arch...p/t-45132.html

"How about this for exquisite machinery...300 naturally aspirated horsepower!
Some new info for you guys about this particular swap. A VQ30 gets its 3.0 liters from a big 93-mm bore and a tiny 73.3-mm stroke, the older VG30 uses a smaller 87.1-mm bore and a much longer 83.1-mm stroke. So putting a VG crank in a VQ would give you a still undersquare 93 x 83.1-mm, resulting in a 3,387 cc engine. A VQ34DE would inevitably end up making quite a bit more power than a VQ30 (about 300hp, and may I remind you that it's still an NA engine.)

Normally adding 10 mm to the stroke would screw up the rod/stroke ratio, causing increased side loads on the pistons, more violent piston acceleration, and higher piston speeds, not to mention changes in ideal cam and ignition timing. The VQ30 starts with a rod ratio of nearly 2:1, however, which is extraordinarily high (and part of why that engine is so smooth) Adding a VG30 crank drops the rod/stroke ratio to around 1.7:1, which is pretty close to ideal!

I went to www.freshalloy.com (http://www.freshalloy.com) to pitch my crazy engine swap idea to some nissan enthusiasts when i was pleasantly surprised that "nissan people" are very similar to us. It's a pretty cool board with a minimal amound of "kill stories" Anywhoo...They're also talking about the new WRX. Many want to buy one since an S15 coming over here doesn't seem very likley."

January 2001... probably means it didn't work, otherwise we woulda heard of it by now.

SR20DEN

iTrader: (7)

Will you please do a little more research before posting crap like this?


The VG30 is 87 x 83 not 87.1 x 83.1

The VG crank will NOT fit in the VQ.

TILLEYS99

iTrader: (4)

I told him that it wouldnt work the other day. I was waiting for you to tell him.

JClaw

iTrader: (17)

Yeah especially considering this is the first time I post anything about the VG.

SR20DEN

iTrader: (7)

I have seen you post tech data for the VQ30 in another thread. Don't you have the same data for the VG?

JClaw

iTrader: (17)

No I don't have it. Only VQ30DE, and I might have found it for VQ35DE but I'm not sure about those numbers yet.

It really sucks that I live in Canada otherwise I would've paid someone to do the swap for me and call it a day. All we have around here are 5.0 experts (although there is this guy with a turbo 350z, but when I talked to him he suggested supercharging instead, which is out of the league since my engine's getting tired and that's part of the reason I'm considering a swap right now. I want NA reliability).

Tatanko

iTrader: (34)

If you ever want engine specs, please please please just go to PoweredByNissan.com. SR20DEN and I worked pretty hard on that, so please put it to good use instead of posting false stuff.

JClaw

iTrader: (17)

Actually, your VQ30DE specs confirm the ones I had (93.0 X 73.3). Thanks for the VQ35 and VQ40 ones however. Didn't know the VQ35 and VQ40 had the same pistons though. I'm assuming a VQ40 crank wouldn't fit in a VQ35 however, I heard the block was larger - love the torque numbers on that one.

Tatanko

iTrader: (34)

I didn't say your VQ30DE specs were wrong, I was more referring to the VG stuff. And your assumptions about the VQ40 crank would be correct.

JClaw

iTrader: (17)

There really isn't any way of knowing how much hp a 3.5 with 3.0 heads until I dyno, right? I'm aware it won't push 255hp at the crank without the 3.5 heads/timing...