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Old 09-16-2021, 09:32 PM   #1
SHE'Z 18
 
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Talking So Long LT-5

Hot off the press…

https://www.google.com/amp/s/www.mot...scontinued/amp

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Old 09-16-2021, 09:50 PM   #2
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Is the only difference between the LT4 and LT5 is the supercharger (and I think dry sump vs wet sump)?
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Old 09-16-2021, 10:12 PM   #3
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Originally Posted by willzilla View Post
Is the only difference between the LT4 and LT5 is the supercharger (and I think dry sump vs wet sump)?
I don't know what the actual term is called but it uses a direct and port injection fuel system too.
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Old 09-17-2021, 02:10 AM   #4
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https://gmauthority.com/blog/gm/gm-engines/lt5/


Overview
The LT5 debuted with the 2019 Chevrolet Corvette ZR1, as the powerplant advanced the Corvette’s supercharging legacy, which began with the 2009 sixth-generation ZR1 and continued with the 2015 seventh-generation Z06. The LT5 still delivers the highest output ever for a Chevrolet production vehicle, thanks in part to a more-efficient supercharger system that offers 52 percent more displacement than the Z06’s LT4 supercharger. Since the unit is larger, it can produce more boost while spinning less, which means less heat under the hood. While the blower is intercooled, heat soak can still sap performance in harsh conditions.

GM’s first dual-fuel-injection system, which employs primary direct injection and supplemental port injection, also helps the LT5 achieve its record output of 755 horsepower and 715 pound-feet of torque, though the official Chevy Corvette intake added up 17 horsepower.

Prior to GM’s official announcement of the 2019 Corvette ZR1 and the LT5, we had the following information about the LT5.

General Motors first filed for the LT5 trademark with the United States Patent and Trademark Office on April 2013 in the goods and services category as “engines for automobiles, sport utility vehicles, trucks and vans”.
GM subsequently filed a second filing citing the same goods and services category in September 2016.
Specifications
Type: 6.2L Supercharged V-8
GM RPO Code: LT5
Displacement: 6.2-liters
Configuration & Cylinders: V8
Vehicle Engine Orientation: Longitudinal
Aspiration: Supercharged
Compression Ratio: 11.5:1
Valve Configuration: Overhead Valve (OHV)
Valves Per Cylinder:
Assembly Site: GM Tonawanda plant, New York, USA
Valve Lifters:
Firing Order: 1 – 8 – 7 – 2 – 6 – 5 – 4 – 3
Bore & Stroke (in / mm): 4.06 x 3.62 / 103.25 x 92
Valvetrain: Overhead valve, 2 valves per cylinder
Fuel delivery: Dual – Direct and Port Injection
Aspiration: Supercharged
Maximum Engine Speed: 6,500 RPM
Drive Belt Rib Count: 11
Materials
Block Material: Cast Aluminum
Cylinder Head Material: Cast Aluminum
Main bearing caps: Tri-Metal
Crankshaft: Forged Alloy Steel
Camshaft: Billet Steel
Connecting rods: Forged Powder Metal
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Old 09-17-2021, 05:45 AM   #5
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Rumor is that this is the replacement for the LT5 motor...



Notice it comes with a retrofit kit so you can slide it into many different types of vehicles.
THANKS gm!
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Old 09-17-2021, 07:15 AM   #6
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From what I've read, it was installed in less than 3000 2019 ZR1 Corvettes and that is the only year of the only vehicle it was ever put into. So, anyone with one of those specific Corvettes could potentially thank GM for making their car worth quite a bit of money by ensuring it will remain incredibly rare.
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Old 09-17-2021, 07:56 AM   #7
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~$19,000 for the motor may not be such a bad deal.
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Old 09-17-2021, 07:57 AM   #8
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Quote:
Originally Posted by 95 imp View Post
Rumor is that this is the replacement for the LT5 motor...



Notice it comes with a retrofit kit so you can slide it into many different types of vehicles.
THANKS gm!
Hilarious.. Yet, so true..
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Old 09-17-2021, 08:02 AM   #9
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What a waste. All that development cost, and to just throw it away. That engine would have been a real asset to so many GM vehicles with a little forethought.
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Old 09-17-2021, 08:52 AM   #10
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What a waste. All that development cost, and to just throw it away. That engine would have been a real asset to so many GM vehicles with a little forethought.
Blackwing checks into the chat
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Old 09-17-2021, 09:07 AM   #11
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Quote:
Originally Posted by willzilla View Post
Is the only difference between the LT4 and LT5 is the supercharger (and I think dry sump vs wet sump)?
No there are quite a few differences and the LT5 is even stronger. It also is the only engine in the LT line up that has a traditional hydraulic cam/lifter setup with no DOD/AFM hardware internally.
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Old 09-17-2021, 09:26 AM   #12
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I don't see why you are excited about this.

I would kill for an LT-5 powered 6th gen.
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Old 09-17-2021, 10:01 AM   #13
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Can you trust an article that leaves it as the LT4 in the ZL1 is "the big stick" in GM's arsenal? No because that is not true. The CT5 V Blackwing has an additional 18 HP (rumored to be heading to the ZL1).

This is why the LT5 is a $30,000 plus engine premium. Everyone Poo Poos me when I ask do you want a $100,000 Camaro? Probably a bit South of that but not by much. And what GM charges for the LT5 has ZERO to do with what Ford charges for the GT500. GM set this engine up to BE low volume. It was never intended to go into other products (unlike the Cadillac Blackwing that died with Omega). 3,000 units x $30,000 is $90,000,000 which likely covered the develpment costs, tooling and the extra piece cost for this engine. So GM likely didn't lose much on this swan song for the C7.

Speaking of swan songs, maybe GM tucks a few of these away for a farewell to ICE powered Camaros in a year or so. Fingers crossed......but it won't be cheap.
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Old 09-17-2021, 10:43 AM   #14
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Quote:
Originally Posted by Number 3 View Post
Can you trust an article that leaves it as the LT4 in the ZL1 is "the big stick" in GM's arsenal? No because that is not true. The CT5 V Blackwing has an additional 18 HP (rumored to be heading to the ZL1).

This is why the LT5 is a $30,000 plus engine premium. Everyone Poo Poos me when I ask do you want a $100,000 Camaro? Probably a bit South of that but not by much. And what GM charges for the LT5 has ZERO to do with what Ford charges for the GT500. GM set this engine up to BE low volume. It was never intended to go into other products (unlike the Cadillac Blackwing that died with Omega). 3,000 units x $30,000 is $90,000,000 which likely covered the develpment costs, tooling and the extra piece cost for this engine. So GM likely didn't lose much on this swan song for the C7.

Speaking of swan songs, maybe GM tucks a few of these away for a farewell to ICE powered Camaros in a year or so. Fingers crossed......but it won't be cheap.
Still doesn't explain why it's more prudent to cancel it instead of selling another 5-10k units, making pure profit having development costs already recouped.
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