I thought the VG33 (maxima/pathfinder) engine was just a bored out version of the VG30. It uses the same stroke of 83mm but has a bore of 91.5mm.
Max RPMs I recall from distant past studies that there are limits to piston speed in the bore with regard to efficiency. Less mass of moving components is important to rev and to rev quickly but a longer stroke means the piston is travelling further for every rev and heat and bore sealing become factors of greater significance. You would need to do calculations for the maximum piston speed and then look at the manufactures technical specifications of the pistons and rings to see if the setup meets your requirements.
Re: Max RPMs From what ive seen the VG doesnt rev all the hard any way but a 1/4 and inch is a fair increase but standard rev limit shouldnt be in issue....if u were revving to 10000 rpms it might be....but you would only stroke if u wanted big midrange on a circuit/street car...youve also got to think about head/manifold efficency because a bigger capacity means more exhaust gas is generated aswell as more air needs to get in....i would put my money towards custom plenums/exhaust manifolds and get the most outta the big (for a jap car) capacity the z already has.
Re: what about using the VG33ER 3.3L Supercharged because that engine makes almost no horsepower. they are a truck engine, even with the blower they dont make as much power or torque as a vg30dett i dont think. and yes the vg33 is the same stroke but has a bigger bore, from what i have read the block has thicker walls to handle 91.5mm, as a vg30 block wouldnt handle that much overbore. i habve heard of some z31 guys using a vg33 block on their vg30et engines. but cannot find any info on people using the block with a vg30gett. are their any differences between the 'et' and the 'dett' blocks?
