[FalconerOneSeven]

Cool read for people like me that always wondered about the differences between both engines.

I learned notably that the manual ZL1 doesn't have the AFM (cylinder deactivation).

https://www.hotrod.com/articles/grit...20of%203.1%3A1.

[KingLT1]

Originally Posted by FalconerOneSeven

Cool read for people like me that always wondered about the differences between both engines.

I learned notably that the manual ZL1 doesn't have the AFM (cylinder deactivation).

https://www.hotrod.com/articles/grit...20of%203.1%3A1.

The LT5 is the only gen 5 LT engine that has 16 standard hydraulic lifters in the engine with no AFM hardware. All of the other LT engines L83,L86,LT1, LT4 have AFM internals but it isn't active on some models.

[EvilZL]

Nice read!!

My 2018 ZL1 A10 does not have the AFM either!

[Flowtie1]

I'm told only the m6 zl1 is without a f m . The A10 has it. Another reason not to get stab and steer ��

[6spdhyperblue]

Your zl1s have afm hardware in the motor it’s just turned off electronically

The lt5 does not have the hardware as king stated

[Idaho2018GTPremium]

Thanks for posting this. As a mechanical engineer, I really enjoy the technical details that Hotrod gets into with their articles. They also had a nice write-up on the development of the LT4: https://www.hotrod.com/articles/the-...e-z06s-lt4-v8/

There's a lot of carryover from the LT4 to the LT5 (obviously); for example: the heads, valves, and pistons (I'm pretty sure I read this in another article), are the same.

Has anyone found any articles about GM's LT4 torture testing? I think it was HotRod that had a nice article detailing what Ford did with the Coyote engines -- in a nutshell: the torture testing Ford put the Coyote engine through was brutal.

[EvilZL]

Originally Posted by 6spdhyperblue

Your zl1s have afm hardware in the motor it’s just turned off electronically

The lt5 does not have the hardware as king stated

yep, I already looked into this last summer before I even bought my 18 ZL1 A10

[Bangkok_ZL1]

That HR article was nice to read.... But you know, I have to laugh when reading the history back in 1990. Cause HR certainly isn't telling the story about why Chevy got their act together. If there is one thing that Chrysler does well, it's innovate. There not good at making a good thing better usually, but they innovate. In 1990 chevy was truly scrambling trying to match the new upcoming Viper, which had already been in the motorshows for about a year, but hadn't hit the streets yet. A 400hp vehicle, no door handles, no top initially. just a bare bones, nice body lined V-10. I'm so glad Dodge did this because it made Chevy, who was just kicking back enjoying it's status, get off their butts and get to work. And it took a while as the viper certainly stayed ahead of the vette for a while. Yet during that time that "magnet" of trying to catch the Viper kept Chevy working to make their product better. But as almost always, Chrysler, who certainly had the edge through the 90's and into the 2000's couldn't keep their mojo going. And now look what's happened to the Vette, a reasonably priced, mid engine, true supercar capabilities coming that will be worldwide mass produced.... now all they need is an Italian interior decorator.... Can't wait to see them here in Thailand. We'll get a Chevy car club here, and maybe Chevy will return to Thailand. It's so sad that Chevy let Ford win Thailand, Mustangs everywhere. But I guess that's for another thread.....

[Idaho2018GTPremium]

Originally Posted by Bangkok_ZL1

That HR article was nice to read.... But you know, I have to laugh when reading the history back in 1990. Cause HR certainly isn't telling the story about why Chevy got their act together. If there is one thing that Chrysler does well, it's innovate. There not good at making a good thing better usually, but they innovate. In 1990 chevy was truly scrambling trying to match the new upcoming Viper, which had already been in the motorshows for about a year, but hadn't hit the streets yet. A 400hp vehicle, no door handles, no top initially. just a bare bones, nice body lined V-10. I'm so glad Dodge did this because it made Chevy, who was just kicking back enjoying it's status, get off their butts and get to work. And it took a while as the viper certainly stayed ahead of the vette for a while. Yet during that time that "magnet" of trying to catch the Viper kept Chevy working to make their product better. But as almost always, Chrysler, who certainly had the edge through the 90's and into the 2000's couldn't keep their mojo going. And now look what's happened to the Vette, a reasonably priced, mid engine, true supercar capabilities coming that will be worldwide mass produced.... now all they need is an Italian interior decorator.... Can't wait to see them here in Thailand. We'll get a Chevy car club here, and maybe Chevy will return to Thailand. It's so sad that Chevy let Ford win Thailand, Mustangs everywhere. But I guess that's for another thread.....

GM released the 375 hp ZR-1 for sale in early 1990. I'm curious how that's GM scrambling to match a Viper that wouldn't go on sale until Jan. 1992? I would think the Viper was in response to GM's ZR-1, but I don't recall exactly since I was a kid less than 1 decade old (a kid that was really into cars).

All I know is I loved both of those cars back then.

[gtfoxy]

I hate to say it, but I’m actually considering going with an LT5 crate motor at some point in the future. The added strength of the bottom end is tempting. Sell the LT5 SC & slap on a 3.1 Magnuson. Same manifold pressure should equate to 800+HP with plenty of fueling & a rare beast that was never built factory, but should have by ‘19.

If it peaks at 6400rpm that would equate to roughly a 7kRPM shift point, from a crate engine. Dual fuel injection right off the bat! Throw in an E tune... Oh my.


https://www.jegs.com/i/Chevrolet+Per...RoC-MwQAvD_BwE

[KingLT1]

The LT5 has a different crank and rods then the LT4 but I believe they still have the shitty thrust bearing design like the rest of the LT engines? Either way they seem to handle a lot of power with no issue.

I think you could put a Maggie 3100 on your LT4 with ToohighPSI port injection system and hit your 800 goal without opening up the LT4.

[gtfoxy]

Originally Posted by KingLT1

The LT5 has a different crank and rods then the LT4 but I believe they still have the shitty thrust bearing design like the rest of the LT engines? Either way they seem to handle a lot of power with no issue.

I think you could put a Maggie 3100 on your LT4 with ToohighPSI port injection system and hit your 800 goal without opening up the LT4.

I’m sure I could, easily.

It’s a pipe dream without the pipe. LOL

$18K doesn’t even include the management side, which who knows how that could be incorporated. Even selling the blower is largely non-realistic. That ECM controlled bypass would be a deal breaker for 99.9% of people that would remotely want it.

Those factory manifolds might be something to look into though. They don’t appear to be near as restrictive at the collector as the LT4 ones. Would need a little fabrication work, but that’s no different than LT’s providing they aren’t dumping into a frame piece or something right there...

[KingLT1]

Yea for sure...it would be a badass swap if it could be more easily integrated.

[Bangkok_ZL1]

Originally Posted by Idaho2018GTPremium

GM released the 375 hp ZR-1 for sale in early 1990. I'm curious how that's GM scrambling to match a Viper that wouldn't go on sale until Jan. 1992? I would think the Viper was in response to GM's ZR-1, but I don't recall exactly since I was a kid less than 1 decade old (a kid that was really into cars).

All I know is I loved both of those cars back then.

Since I'm almost 60, I do remember. And like all cars, including the C-8 now. Word had been out amongst car lovers even before the motor shows in 1989 when the Prototype Viper hit the audience and the magazines. So when Dodge came out of nowhere and hit the general public of America with a base model exotic looking car with a 400 horse V-10 that sported serious lines and 275/335 tires. Yes, Chevy took note and got off their butts and started working. And that war started the best comeback for performance cars in the USA. Because up till then the Vettes only "competition" was from a Mustang that had a few hundred horses at the most and looked God awful with the worst body lines ever drawn on paper, a freakin AMC Pacer had better body lines (OK, maybe that one's a tie). And as GM tried to keep up with the Viper, and it was always GM trying to keep up with the viper IN THE POWER DEPARTMENT, performance of all cars got better and better. The car industry realized that power sells. Then Ford started to get their stuff together, with a GT coming out also. And as each kept trying to make their flagship car better, the general public kept getting better performance cars. Literally, I just bought a new car that has exactly twice the HP as when I was selling Toyota's Flagship Supra back in 93 (and that was considered a badass car back then), and almost 3 times the Hp as when I sold camaros in 95 (If my memory serves me correctly the 1LE packed camaro had 275hp). That's my perspective of how it all unfolded. When the Viper came out, the performance world from the manufacturers changed drastically. But Chrysler couldn't capitalize and follow through. They didn't evolutionize like the Vette, so they became like the dinosaurs, extinct. And look at the Vette now, poised to take on the exotics at 1/3rd the price.

By the way, I used to live in Boise. Absolutely love it there; America's best kept secret.