Want to build a destroked VG30, advice and info needed

[Still_Good]

So for a long time, I'd wanted to built a low displacement super high revving V8.Unfortunately any economically viable V8 doesn't have a good enough valve train, even fully built. (And for the record I'm an import guy and like cool technology, not retarded displacement)

What I'd like to know is if any companies make destroked cranks for the VG30, and is so, at what displacements. My goal is to build a motor that can rev to 12,500. I am aware this will require a fully built valvetrain etc.

I'd like a crank with a stroke length of about 68. The VG20 has a 69.5mm stroke, but I don't think that crank will mate to a VG30, so I suppose I'd need a custom one made. If it were to work, the 2.3L would have the same piston speed at 11,000rpm as the VG30 has at 9k. My goal of 12.5k has the equivalent speed of 10k in a VG30.

I think using aluminum pistons would would allow a significant enough reduction in stress to make it possible. Given how much less aluminum pistons weigh (isn't it like 30% of cast iron?) with a forged crank and good rods, I think it just might work.

In addition to the massively decreased stroke, would it be possible to go with longer (custom, obviously) rods too? That would increase torque overall, and decrease the wear from high rpm operation.

Thanks in advance,Zak

Modified by Still_Good at 5:29 AM 6/6/2008

Modified by Still_Good at 6:19 AM 6/6/2008
Modified by Still_Good at 10:45 AM 6/6/2008

[mtcookson]

That would definitely have to be something custom as even finding a stroker crank for the VG is difficult. You may actually look into the VG20 a bit more, you could probably work that one over to get it where you want it.

I can't find specific info, but from what I can find... it almost seems as though the VG20 might just have the same block as the VG30's just a smaller bore and shorter stroke. It could actually be possible to use the VG20 crank in a VG30... but only way to know for sure would be to find some measurements or get a VG20.

The VG's have aluminum pistons stock with forged rods... but with the revs you're looking for custom will be an absolute must. Revs can actually be harder on an engine than power so it will be need to definitely be built strong.

As far as the rods, if I'm right about the VG20 having the same block it should have longer rods to begin with but I can't find any specifics. It would be interesting to see its stock rod/stroke ratio to see what kind of revs it could potentially do. I bet it could do pretty good.

Definitely keep us up to date on this... I'm very interested to see the results of your project!!