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.

 

Originally posted by Sleasy@Jul 3 2008, 09:11 PM
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.

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Is there a question in there?

 

Originally posted by wfranklin@Jul 9 2008, 08:15 PM
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.

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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.

 

QUOTE (mkaresh @ Aug 7 2008, 11:25 AM) index.php?act=findpost&pid=181450

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.

I know I am digging this one out of the grave!
Well the Genesis and Azera 3.8L are both lambda motors and the HP change comes from the heads and the ECU. The new heads have valve timing on both intake and exhaust sides. How doe s a lil Sonata owner know this? I have been reserching the diffrences between these motors for th epast few months. Why? Lets just say I have grown out of the 3.3L and need something new

 

I had my Azera service yesteday at Columbia Hyundai here in Cincinnati, and for the first time I saw the Genesis in the showroom. I was amazed how big the car appeared. It looked wider than the Azera and even longer. Yet the cockpit was beautiful. More plush than the Azrea so I had to take out a demo for a spin.

I must say the Genesis is much quieter than the Azera in the ride and engine noise, The motor was the 3.8L and the sales guy said it can run on regular fuel. My Azera is just over 2 years old but I would consider trading my Azera in with only 16,000 miles to buy or lease the Genesis. I could get a demo for 31,000 but could work the price down some I'm sure. Nobody buying or even looking at cars yesterday.

Don't get me wrong I still enjoy my Azera a great car with a few clunks but the Genesis is truly an awesome automobile no matter what kind of engine it has in it.

 

All your answers in one place on bore, stroke, horsepower, and torque.

http://en.wikipedia.org/wiki/Hyundai_Lambda_engine

The engine block is the same and so is the displacement. The differences in output must be in the fuel map, variable valve timing design, and possibly the camshaft lobe profile.

Byron

 

QUOTE (byronguidry3732 @ Jan 13 2009, 10:27 AM) index.php?act=findpost&pid=209083

All your answers in one place on bore, stroke, horsepower, and torque.

http://en.wikipedia.org/wiki/Hyundai_Lambda_engine

The engine block is the same and so is the displacement. The differences in output must be in the fuel map, variable valve timing design, and possibly the camshaft lobe profile.

Byron

Another possibility for more HP. I don't know about this for sure, just guesssing.

The Azera does not have a true dual exhaust system. I think the Genesis does.

David <><