NemesisC5

I haven't seen anything posted regarding components / changes contributing to the power increase over LT1. The new exhaust headers, intake manifold, air cleaner assembly along with more precise (aggressive) tuning could accomplish an increase from 460 hp to 490 hp (495 HP with Z51 specific exhaust). Is the LT2 engine block Corvette specific to accomodate ME layout OR is the 6.2 block shared with LT1? Has GM shared any information on the LT2 beyond HP & TQ?

If I missed a post addressing this info please advise.

captain vette

You did not miss anything, the answer will come soon for sure.

JMB

They also changed the cam to add a few degrees to the exhaust.....these changes combined with what you have are it.

NemesisC5

Thanks gentlemen. it seemed like not much more was required however to hit the numbers however thought I’d ask. Subtle but interesting point on the cam.

MitchAlsup

The straighter intake runners are about all that would be necessary to make "that" much more HP.

Remember the height limitations of the C7 bonnet, well, those are gone with the engine behind the driver.
So instead of folding the runners under the bonnet, you just stick them straight up and the air flow faster and straighter.

PRE-Z06

https://www.caranddriver.com/news/a2...c8-lt2-engine/

84 4+3

We ever learn what the second timing chain was for?

and yes, straighter runners = more power. Look at what they were doing with the old cross rams, straightest shot possible.

t56mike

The second chain is for another scavenge pump for the oil system located in the v according to Car and Driver. Tadge stated during the reveal that there were 3 scavenge pumps on the system.

Quinten33

Could that second chain be a part of the relocated dry-sump system?

Michael A

I was surprised that after six years, they didn't do more to the LT1 to make it an LT2. More exhaust lift, better flowing intake and exhaust, and they called it a day. I think their goal was 495 HP, and they weren't going to spend a dime more than they had to to get there.

I was expecting they would go well over 500 HP with new heads, new pistons, new cam, and a bump in the redline. Certainly with new CFD software, they could get more flow through the heads.

K-TownMike

Ay what point are they just chasing bigger numbers? If the performance is there, why do they need 550 hp out of the base vehicle? There will likely be two further models with higher horsepower if that's what you need. As it is it is the second quickest corvette of all time in some respects.

Michael A

Seems like your are jumping the gun a bit. We've only been told the 0-60 time is under 3 seconds for the Z51. That's it. Unlike Porsche, GM is often optimistic, too.

I'm just saying that I believe their goal was 495 at the cheapest possible cost.

K-TownMike

I would say you are jumping the gun and assuming the performance won't be there with 495hp, even though the one metric we have been given is outstanding.

Zjoe6

And don't forget the under 60k metric. The engine is the most expensive part of a car. They saved a lot with the LT2 with only minor changes.

84 4+3

Thanks.

CPhelps

A coworker read an article that said they basically approached it as repackaging the LT1 in the new ME car, and along the way they were able to do some of the changes such as the new intake manifold that resulted in more power, so I think you're right that they didn't actively try to go for max power. I'm still trying to find that article myself but haven't read the C&D article linked above yet.

That said, if they were happy with the performance already, then the ROI may not have been there to go for more in the base car in order to keep development costs down. The LT1 heads may not have much low hanging fruit that's feasible for mass production, since it was also designed using advanced cfd tools not that long ago.

NemesisC5

https://www.corvetteonline.com/news/...8s-powerhouse/

SBC_and_a_stick

This is how they got the base car just under $60k, they basically reused the engine. Given the weight increase I think the power to weight is similar to C7. From 30 mph up it will probably accelerate the same.

68roadster

Agree. The # was not that important to them, vs the performance. And, It gives them something to improve on in later years to try to entice people to trade up for a newer version with X amount more power in the base car. This is an old formula from the big 3. I don't care about bragging rights. I am not a guy who would buy a muscle car with more horsepower. I want that awesome ME Corvette with 495 hp.

PRE-Z06

You don’t think it’ll run like a bolt-on C7 since it essentially has better intake/exhaust? Anyone heard cd numbers yet or how the frontal area compares?