A comprehensive look at the direct-injected heart of the 2014 Corvette [GMHTP]
11-03-2012, 09:55 PM
#41
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I am wondering why they are only showing 20 HP over the Ls3 after all the expense of development? The torque is nice but I would have expected 500 HP plus out of this motor. The new locked ECM is going to suck because even though DI is great for boost you won't be able to tune for it.
11-04-2012, 12:47 PM
#42
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I think I was right next to you while you were taking these pictures. I got a chance to talk to one of the engineers and boy this engine is technical.
11-12-2012, 02:29 PM
#44
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I'm excited about the possibilities from GM naming this new engine the LT1. The engine is high tech and trick yet very under-stressed.
The LT1 has never been a name that really cast fear into the hearts of the competition, this is the base performance V8 street car engine.
That leaves room for variants such as a Gen 5 LS7, LS9 or ZR1 - names that do command respect. A 427 version with direct injection, variable valve timing, titanium rods and more breathing will be really something.
Add on a pair of remote (to get the heat out of the engine bay and allow better plumbing to reduce back pressure and pressure drop) mounted low boost turbos and you'd have a very clean burning monster that will out perform the current ZR1 everywhere yet achieve incredible mpg at cruise. With no parasitic power loss off the crank a high compression/low boost set up could easily achieve mid 30's mpg highway yet make 800hp and pass emissions. Yee Haa!!
The LT1 has never been a name that really cast fear into the hearts of the competition, this is the base performance V8 street car engine.
That leaves room for variants such as a Gen 5 LS7, LS9 or ZR1 - names that do command respect. A 427 version with direct injection, variable valve timing, titanium rods and more breathing will be really something.
Add on a pair of remote (to get the heat out of the engine bay and allow better plumbing to reduce back pressure and pressure drop) mounted low boost turbos and you'd have a very clean burning monster that will out perform the current ZR1 everywhere yet achieve incredible mpg at cruise. With no parasitic power loss off the crank a high compression/low boost set up could easily achieve mid 30's mpg highway yet make 800hp and pass emissions. Yee Haa!!
11-12-2012, 02:31 PM
#45
TECH Apprentice
I'm excited about the possibilities from GM naming this new engine the LT1. The engine is high tech and trick yet very under-stressed.
The LT1 has never been a name that really cast fear into the hearts of the competition, this is the base performance V8 street car engine.
That leaves room for variants such as a Gen 5 LS7, LS9 or ZR1 - names that do command respect. A 427 version with direct injection, variable valve timing, titanium rods and more breathing will be really something.
Add on a pair of remote (to get the heat out of the engine bay and allow better plumbing to reduce back pressure and pressure drop) mounted low boost turbos and you'd have a very clean burning monster that will out perform the current ZR1 everywhere yet achieve incredible mpg at cruise. With no parasitic power loss off the crank a high compression/low boost set up could easily achieve mid 30's mpg highway yet make 800hp and pass emissions. Add water injection to reduce Nox and allow better timing.... Yee Haa!!
The LT1 has never been a name that really cast fear into the hearts of the competition, this is the base performance V8 street car engine.
That leaves room for variants such as a Gen 5 LS7, LS9 or ZR1 - names that do command respect. A 427 version with direct injection, variable valve timing, titanium rods and more breathing will be really something.
Add on a pair of remote (to get the heat out of the engine bay and allow better plumbing to reduce back pressure and pressure drop) mounted low boost turbos and you'd have a very clean burning monster that will out perform the current ZR1 everywhere yet achieve incredible mpg at cruise. With no parasitic power loss off the crank a high compression/low boost set up could easily achieve mid 30's mpg highway yet make 800hp and pass emissions. Add water injection to reduce Nox and allow better timing.... Yee Haa!!
11-12-2012, 02:41 PM
#46
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I'm glad to see GM decided to go with DI on its flagship hotrod engine. If the power gains from port injection to DI on a gas motor, are anything similar to the gains the diesels seen by going from IDI to DI, it will be an epic improvement.
Also glad to see a splayed valve arrangement as well, valve shrouding becomes less and less the higher the valve goes.
I just don't understand why they chose to run a presumable diaphragm style high pressure pump off the cam lobe instead of a rotary style pump like the cp3 and cp4 that the current HPCR diesels are running.
At any rate, DI, and splayed valve angles, along with the jump in compression is a major step forward. I wouldn't be surprised if these things arent making 450hp to the tire.
Also glad to see a splayed valve arrangement as well, valve shrouding becomes less and less the higher the valve goes.
I just don't understand why they chose to run a presumable diaphragm style high pressure pump off the cam lobe instead of a rotary style pump like the cp3 and cp4 that the current HPCR diesels are running.
At any rate, DI, and splayed valve angles, along with the jump in compression is a major step forward. I wouldn't be surprised if these things arent making 450hp to the tire.
11-12-2012, 03:29 PM
#47
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I'm glad to see GM decided to go with DI on its flagship hotrod engine. If the power gains from port injection to DI on a gas motor, are anything similar to the gains the diesels seen by going from IDI to DI, it will be an epic improvement.
Also glad to see a splayed valve arrangement as well, valve shrouding becomes less and less the higher the valve goes.
I just don't understand why they chose to run a presumable diaphragm style high pressure pump off the cam lobe instead of a rotary style pump like the cp3 and cp4 that the current HPCR diesels are running.
At any rate, DI, and splayed valve angles, along with the jump in compression is a major step forward. I wouldn't be surprised if these things arent making 450hp to the tire.
Also glad to see a splayed valve arrangement as well, valve shrouding becomes less and less the higher the valve goes.
I just don't understand why they chose to run a presumable diaphragm style high pressure pump off the cam lobe instead of a rotary style pump like the cp3 and cp4 that the current HPCR diesels are running.
At any rate, DI, and splayed valve angles, along with the jump in compression is a major step forward. I wouldn't be surprised if these things arent making 450hp to the tire.
they probably went with the diaphragm version because the rotary is HUGE as welll as heavy.
11-16-2012, 01:57 AM
#50
I'm excited about the possibilities from GM naming this new engine the LT1. The engine is high tech and trick yet very under-stressed.
The LT1 has never been a name that really cast fear into the hearts of the competition, this is the base performance V8 street car engine.
That leaves room for variants such as a Gen 5 LS7, LS9 or ZR1 - names that do command respect. A 427 version with direct injection, variable valve timing, titanium rods and more breathing will be really something.
Add on a pair of remote (to get the heat out of the engine bay and allow better plumbing to reduce back pressure and pressure drop) mounted low boost turbos and you'd have a very clean burning monster that will out perform the current ZR1 everywhere yet achieve incredible mpg at cruise. With no parasitic power loss off the crank a high compression/low boost set up could easily achieve mid 30's mpg highway yet make 800hp and pass emissions. Add water injection to reduce Nox and allow better timing.... Yee Haa!!
The LT1 has never been a name that really cast fear into the hearts of the competition, this is the base performance V8 street car engine.
That leaves room for variants such as a Gen 5 LS7, LS9 or ZR1 - names that do command respect. A 427 version with direct injection, variable valve timing, titanium rods and more breathing will be really something.
Add on a pair of remote (to get the heat out of the engine bay and allow better plumbing to reduce back pressure and pressure drop) mounted low boost turbos and you'd have a very clean burning monster that will out perform the current ZR1 everywhere yet achieve incredible mpg at cruise. With no parasitic power loss off the crank a high compression/low boost set up could easily achieve mid 30's mpg highway yet make 800hp and pass emissions. Add water injection to reduce Nox and allow better timing.... Yee Haa!!
12-02-2012, 11:26 PM
#51
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12-12-2012, 10:27 PM
#54
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I am very excited for this engine, and cannot wait to get my hands on one.
I only have one concern that I've seen in the past with direct injection. With the fuel being introduced at the beginning of the intake chamber on the head in traditional fuel injection, the fuel would act as a cleaning agent and keep the intake chambers clean.
With direct injection, fuel bypasses the intake chamber of the head. Intake valves are one of my biggest concerns with serious build up over time. Has GM seen this issue on the V6? I don't have much experience outside of the LS1-7, or Ford 4.6, 5.4, but its a problem I've seen talking to people I know who deal with it directly.
Thanks!
I only have one concern that I've seen in the past with direct injection. With the fuel being introduced at the beginning of the intake chamber on the head in traditional fuel injection, the fuel would act as a cleaning agent and keep the intake chambers clean.
With direct injection, fuel bypasses the intake chamber of the head. Intake valves are one of my biggest concerns with serious build up over time. Has GM seen this issue on the V6? I don't have much experience outside of the LS1-7, or Ford 4.6, 5.4, but its a problem I've seen talking to people I know who deal with it directly.
Thanks!
12-13-2012, 01:14 PM
#58
An intake charge contaminated with engine oil builds carbon on valves. With the direct injection being implemented and thus no fuel detergents contacting the valves, GM had to radically alter our familiar PCV setup. The result is the new style valve covers.
01-15-2013, 10:54 PM
#60
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Very nice stuff, love how Gm has managed to keep the single cam dual valve V8 engines alive and kicking dual overhead cam 4 valve engines buds let and right.
I for one have no anxiety about the new 6.2 litters LT1 nor will go back to the future with the new stuff.
I'm happy with my 440 CI lsx block ls7 simple and easy to work on, making 740 crankshaft HP N-A on E85 which burs clean and don't stink as gasoline does, in my street car.
I for one have no anxiety about the new 6.2 litters LT1 nor will go back to the future with the new stuff.
I'm happy with my 440 CI lsx block ls7 simple and easy to work on, making 740 crankshaft HP N-A on E85 which burs clean and don't stink as gasoline does, in my street car.