The valve train on the 3.3 V6 and the 3.8 V6 in the Azera are the same. The valve sizes are identical. I think this explains the reason why the 3.3 delivers more HP per liter than the 3.8. It also explains the 300+ HP being developed by the Genesis 3.8 V6. New valve train actually made for the 3.8. Not sure if different cams are being used. Yes, I know it's spelled Genesis.

Fixed ~ madderhatter :thumbsup:

This post has been edited by madderhatter: Jul 11 2008, 07:43 PM

Are the bore and stroke the same on both engines? If so, the heads would be the only area left to make 3.8L of volume compared to the 3.3L. You could easily be correct, because manufacturers often use different heads to create different swirl patterns in the air-fuel mixture. The more active the swirl pattern, the more power that is extracted from the fuel. Just making the bore and stroke produce more volume doesn't necessarily create more power per cubic unit volume. There are lots of variables involved. Even placement of spark plugs has a noticeable effect on power output.

Joe

The 3.8L V6 in the Genesis pumps 290HP, not 300+. It's a complete brand new engine setup, and is in no way shape or form anything like the 3.8L in the Azera's and Veracruz. Same displacement, completely different engine.

Is there a question in there?

The 3.8 L in the Genesis Coupe running on premium gas is supposed to be 300 +HP, I think. Regardless, whether it's 290 or 300, the output is still +10% over the 3.8L inb the Azera.

Where did you get the information that the 3.8 L in the Genesis is "completely" different than the 3.8L in the Azera? I find that very hard to believe.

I do know that the 3.3L and the 3.8L V6 in the Azera share the same valve sizes. I believe it explains the diffence in output per liter for the two engines.

I too don't believe that it's a brand new engine (too expensive to develop) it could be the same as the Azera with a rebore and a different head, but if the same displacement it's most likely only a different head.

It's probably got a re tuned computer.

Wfranklin is correct, it is not the same engine.

It's very close to the Azera, Veracruz, and Entourage but very few parts are interchangable with the Genesis 3.8. The block was redesigned to strengthen areas for longitudinal mounting, and for changes to the cylinder heads. Most of the changes were made in the cylinder head. The new heads have CVVT on intake and exhaust cams, as opposed to only in the intake cams on the previous 3.8. Coolant passages in block, but mainly in the cylinder head have been reworked. Intake manifold and exhaust are obviously not the same due to the N/S engine mounting. These changes along with PCM tuning account for the increased HP.

Different valve timing = different outputs. Also might have a less restrictive intake and exhaust.

If the valve sizes are the same in the 3.3 and 3.8, then the bore is the same but the stroke is different. Both can't be the same, because displacement is calculated from bore and stroke. Changing the heads can change the compression ratio and combustion chamber volume, but not the displacement.