GM to revive LT5 name

[GOLDCYLON]

Originally Posted by Kevin

there's only a handful of people who know what the lt5 is. lt1 lt4 l88, which gm recently trademarked again, zl1 these are known.

Its generational. A lot of corvette fans know of the LT5 and the ZR-1 espicially if they were in the teens and twenties in the late 80s and 90s.

Prob the same number of people who knew what a Nickey, Grumpy, Yenko Camaro were back in the day and yes the ZL1

Younger folks not so much....

[Kevin]

yenko is a honda dealer now. makes me suicidal every time i see a yenko honda plate frame. Friend of mine used to work for yenko chevy, she had some awesome stories

[Hog]

One good thing about GM's use of cylinder deactivation (DOD then AFM) is that it forces the displacement of a V8 engine to stay higher.
That is one of the reasons why the C7 Vette's GEN 5 engine is 6.2 liters and not 5.5 liters. The smaller displacement V8 did not meet GM's criteria for torque while in 4 cylinder mode.
GM re-arranging the cylinder head port orientation has allowed the use of conventional rocker arms instead of the offest rocker arms which are used in the LS7,LSA,LS9,LS3,L99,L92 and the rest of the GEN 4 engines.

GM's new truck V6(LV3) is still 4.3 liters in displacement and will feature DI, VVT and AFM. But instead of dropping from 6 tp 3 cylinders while the Adjustable Fuel Management is engaged, it will drop down to V4 mode. This will provided enough hot exhaust gasses for proper catalyst function on BOTH exhaust banks. Dropping to 3 cylinders would not.

Honda has a V6 that has a 6 cylinder, 4 cylinder AND 3 cylinder mode. The V6 switches between 3 or 4 cylinders in order to keep both cats hot.
The 2014 GM trucks retain the 6.2(L86) and 5.3(L83) liter engine as well as the 4.3 engine, but will drop the 4.8 size. So it appears that GM's GEN V engines will use the letter "L" across the board in the cars and trucks.

peace
Hog

[mgg]

I have read form multiple sources that L88 is being kicked around a lot lately. It would certainley be a historical nameplate to resurect and I am confident that if chosen the car would be deserving. As far as cylinder deactivation goes, I have it on my Suburban and it works great. That huge vehicle is averageing about 17 mpg and on the highway with five people and luggage is getting around 20 mpg doing 75 mph. Quite impressive if you ask me. As far as Gm developing anothe double overhead cam motor with a high level of performance, I think that is out of the question. Packaging, weight, would be two huge reasons that will never happen. Yesterday, I sat down are re read a large portion of " The Heart of the Beast". I hope they never do try this again. I just think it is just incredible what was accomplished. I get the warm and fuzzies reading this book and know what a significant historical car the ZR-1 really is. It is unquestionably the greatest developemental story of any Corvette and the passion and drive it took to deliver this car is unmatched. Makes me feel VERY lucky to own one of the remarkable cars and to be able to drive and enjoy a peice of automotive history

[USAFPILOT]

My Pontiac G8 GT has the 6.0L L76 engine with the DoD tech. It drops to 4 cylinders and gets about 27MPG using 87 Octane on the freeway. It is 4000lb car too. It still makes 361HP, which gets the job done on a daily driver and has not had one hiccup since I bought it new. The reliability of cylinder deactivation is there now. It is also in most of the trucks GM produces now.

I saw the new Chevy SS will get the LS3, but in order for me to trade in the G8 it will need to eventually get the LS1 with the 450HO and gas saving technology. When you drive 110 miles a day it is nice to be in a fast comfortable car, but also one that can sip fuel.

[XfireZ51]

Really like the G8!

[Paul Workman]

Originally Posted by Hib Halverson

I can't help but to think that speaks volumes about Coyote-powered Mustangs.

Ummmm.... Not sure its not apples and oranges.

The Coyote is a 5.0L making 412 peak net pulling a 3723# Mustang GT

The C6 LS3 is a 6.2L making 430 peak net pulling a 3208# car.

Now for some very interesting numbers check out the 4.5L Farrari in the 458, and then let's talk about engine architecture...

P.

[USAFPILOT]

I wonder why Ferrari engines get such terrible fuel economy, when a 662HP Ford can get in the mid 20's with a heavier car.

[Fully Vetted]

Originally Posted by LancePearson

...The cylinder deactivation technology sounds good but not to be a wet blanket....when they had it in Caddy's it didn't last and wasn't that great.

Originally Posted by Hog

One good thing about GM's use of cylinder deactivation (DOD then AFM) is that it forces the displacement of a V8 engine to stay higher.
That is one of the reasons why the C7 Vette's GEN 5 engine is 6.2 liters and not 5.5 liters. The smaller displacement V8 did not meet GM's criteria for torque while in 4 cylinder mode.
GM re-arranging the cylinder head port orientation has allowed the use of conventional rocker arms instead of the offest rocker arms which are used in the LS7,LSA,LS9,LS3,L99,L92 and the rest of the GEN 4 engines.

GM's new truck V6(LV3) is still 4.3 liters in displacement and will feature DI, VVT and AFM. But instead of dropping from 6 tp 3 cylinders while the Adjustable Fuel Management is engaged, it will drop down to V4 mode. This will provided enough hot exhaust gasses for proper catalyst function on BOTH exhaust banks. Dropping to 3 cylinders would not.

Honda has a V6 that has a 6 cylinder, 4 cylinder AND 3 cylinder mode. The V6 switches between 3 or 4 cylinders in order to keep both cats hot.
The 2014 GM trucks retain the 6.2(L86) and 5.3(L83) liter engine as well as the 4.3 engine, but will drop the 4.8 size. So it appears that GM's GEN V engines will use the letter "L" across the board in the cars and trucks.

peace
Hog

Originally Posted by mgg

...As far as cylinder deactivation goes, I have it on my Suburban and it works great. That huge vehicle is averageing about 17 mpg and on the highway with five people and luggage is getting around 20 mpg doing 75 mph. Quite impressive if you ask me.

Originally Posted by USAFPILOT

My Pontiac G8 GT has the 6.0L L76 engine with the DoD tech. It drops to 4 cylinders and gets about 27MPG using 87 Octane on the freeway. It is 4000lb car too. It still makes 361HP, which gets the job done on a daily driver and has not had one hiccup since I bought it new. The reliability of cylinder deactivation is there now. It is also in most of the trucks GM produces now.

Yeah, this is is not the old 4-6-8 of the old Caddy's. That was a great idea followed by a horrible execution. I'm sure they learned a lot from that fiasco which is probably why they now have it pretty much figured out.

[Fully Vetted]

Originally Posted by Paul Workman

...Now for some very interesting numbers check out the 4.5L Farrari in the 458, and then let's talk about engine architecture...

Another very close match for the 458 engine is the Lexus LFA V10.


Displacement –

LFA – 4.8L V10
458 – 4.5L V8


HP –

LFA - 562 @ 8700 rpm
458 - 562 @ 9000 rpm

Following info taken from LeftLanenews.com and Automobile-Catalog.com:

LFA –

4.8-liter V10 developed exclusively for use in the high-dollar supercar. Power is rated at 562 horsepower and 354 lb-ft of torque. Although maximum twist doesn't come on until the needle sweeps past the 6,800rpm mark, Toyota says that 90 percent of the LFA's torque is available between 3,700rpm and the screaming 9,000rpm redline.



458 –

4.5-liter V8 cranks out 562 horsepower at 9,000 rpm (125 horsepower per liter, a record for naturally-aspirated piston engines). Torque is rated at 398 lb-ft at 6,000 rpm, 80 percent of which is available from 3,250 rpm.

Across the board it still looks like the 458 engine wins in all aspects but it is very close. And you would not believe the screaming wail that comes out of the LFA's V10. It absolutely sounds just like an F1 car. The LFA revs so fast they had to use a digital tach because a conventional one would not sweep fast enough. It revs from idle to redline at 9000 rpm in astonishing .67 secs!

I think these are two of the greatest engines on the planet.