Why does this tread title say this?

I thought the LS2 was the 6.0 L and the 6.2L the LS3

Why does this tread title say this?

I thought the LS2 was the 6.0 L and the 6.2L the LS3

G8 utilizes an LS2-based engine called the L76. Not quite the same, close, but not much. There are many threads about the differences already so I won't get into it.

Why does this tread title say this?

I thought the LS2 was the 6.0 L and the 6.2L the LS3

Yeah, I am pretty sure the l76 is the the same as the ls2, except it has AFM (active fuel management) that shuts down to 4 cylinders when your on the highway.

Yeah, I am pretty sure the l76 is the the same as the ls2, except it has AFM (active fuel management) that shuts down to 4 cylinders when your on the highway.

NOT THE SAME...

Please refer to the following:

EDIT: Ok... link was less helpful than I thought. Only thing it has in common with the LS2 is the block, IIRC. Everything else is different. Don't you think if it was the "same" as the LS2 it would output the same 400 hp/400 ft-lbs torque?

wikipedia hold the answers you seek

http://en.wikipedia.org/wiki/L76
http://en.wikipedia.org/wiki/Chevrolet_Small-Block_engine
http://en.wikipedia.org/wiki/Chevrolet_Big-Block_engine

use the force, my padawan
and I'm sure there is more.

It will be interesting to see how the L76 hold up with high mileage. Will the 4 cyls that run all the time wear out more than the other 4?

Do you drive on the freeway at cruise most of the time?

It will be interesting to see how the L76 hold up with high mileage. Will the 4 cyls that run all the time wear out more than the other 4?

All 8 cylinders always turn. The only difference in wear might be to the valve springs.

All 8 might turn but combustion is happening in only half of the cylinders, which might be expected to wear at a higher rate.

It will be interesting to see how the L76 hold up with high mileage. Will the 4 cyls that run all the time wear out more than the other 4?

all 8 pistons are continously moving when the motor runs so i doubt there'd be much difference in ring wear. maybe some extra wear on the valves/stems/seals on the cylinders that are always active. BUT, the L76 is rated to a minimum life expectancy of 200k, so i wouldn't worry too much about it...

Of course they always turn but the heat in the 4 active cyls will add to the wear. the rod bearings will wear more from thrust and the spark plugs will have a different life span. It will be interesting to watch how it plays out over time.

is it always the same 4 cylinders that shut down?

is it always the same 4 cylinders that shut down?

yes...

Of course they always turn but the heat in the 4 active cyls will add to the wear. the rod bearings will wear more from thrust and the spark plugs will have a different life span. It will be interesting to watch how it plays out over time.

i know when chrysler introduced their DOD type system on the hemi...an engineer was asked about longevity. he said that after 150k miles there was only a very slight difference in wear between the active/occasionally inactive cylinders/valves...fwiw.

GM and Dodge have a similar system. Both engines turn off the same 4 cylinders. Fancy German cars like Mercedes Benz actually can individually turn off cylinders, so they alternate every other revolution. Each cylinder only fires every other time.

GM and Dodge have a similar system. Both engines turn off the same 4 cylinders. Fancy German cars like Mercedes Benz actually can individually turn off cylinders, so they alternate every other revolution. Each cylinder only fires every other time.

So it effectively becomes an eight stroke engine.... interesting.

It will be interesting to see how the L76 hold up with high mileage. Will the 4 cyls that run all the time wear out more than the other 4?

Which is one of the reasons why I would have cylinder deactivation deleted by a tune.

If you've read this magazine for any measurable length of time, you've undoubtedly heard us bantering about the L76 intake paired with L92 cylinder heads. Oddly enough, up until now we didn't even have a vehicle in the United States that used this particular manifold. The good news is that not only do we finally get this mystical intake, we also get cylinder heads that fit the smaller bore-but with the same benefits of the L92-style heads, including the rectangular LS7-style intake ports.

In basic terms, the L76 is a natural extension of the LS2. They share a similar bore (101.6mm LS2, 101.3mm L76), and the same 92mm stroke, but there are also many differences that should be noted. First up is the addition of "Active Fuel Management," or Displacement on Demand, as it was originally termed. This system allows the deactivation of four specially provisioned cylinders through the use of particular lifters, oil channels, and tolerances on the camshaft lobes of those four cylinders. The L76 can thus transition from a V-8 to a V-4 and back again, with nearly seamless precision all but unnoticed by the driver. Additionally, this system increases fuel economy under low-load, low-throttle situations such as highway driving, but doesn't play a large role in city fuel economy.

http://www.gmhightechperformance.com/features/0707gm_pontiac_g8/index.html

the L76 is 6.0 litre Vortec truck based not LS2 based. The active fuel management also was a big waste of $$$ as it does not work enough to really save much $$ and it'll become a problem on cars that get modded much past 350 whp.