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Old 03-17-2013, 03:57 PM   #29
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Different times...in '08 we weren't staring 35.5 mpg mandate in the face, and now we are.

400 hp L99/3900 Curb Weight = 9.75 lb/hp
426 hp LS3/3900 Curb Weight = 9.15 lb/hp
375 hp 5.3/3600 Curb Weight = 9.60 lb/hp
385 hp 5.3/3600 Curb Weight = 9.35 lb/hp...and a "sport-tuned" DI 5.3 can readily (and warrantably) make this number.
385 hp 5.3/3500 Curb Weight = 9.09 lb/hp

As to cost, a current 4.8 V8 truck motor costs how much less to build than a current 5.3 truck motor? But how much MORE is the 5.3? And a current 6.2 truck engine probably costs only a few bucks more to manufacture, but "retails" for considerably more, "because we can"...

As women all over the world will confirm, "size isn't everything"...but it seems that the bigger the engine, the more 'spensive it is. It is known that the 3.6 DOES cost more to make than a (current) 4.8/5.3 BEFORE a turbo or two, yet prices for less...hmmm. And those are the only two ways to get mid/upper 3's, hp-wise, for what needs to be a current-world-sensitive mid-horse Gen-6...

IMVHO

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Old 03-17-2013, 06:49 PM   #30
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..
My only problem with this concept of a base model 5.3L is cost...it won't be any cheaper to produce a 5.3L than the LT1...not if we're assuming it uses all the same tech.
I don't think it would be much cheaper either. I just feel that if the 5.3 becomes the "standard" V8 we can expect it to perform very well and have peak power numbers much better than the truck version.

There is no way in hell the lighter next gen Camaro will be slower....so no matter what engine they decide to use I'm sure it will perform great.
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Old 03-17-2013, 07:41 PM   #31
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The LT1 has been announced as making "450+ hp". A 5.3 = .85 of the 6.2's displacement. Simple (?!) math would say a 5.3 built/tuned similarly to the LT1 "should" make at least 385+...perhaps more...with undoubtedly better mpg. considering the coming trannies that will be available, combined with lighter Curb Weight and improved aero considerations.
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Old 03-17-2013, 10:30 PM   #32
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Remember GM engineers stated that the choice for a 6.2 liter V8 instead of a 5.3 liter V8, was due to cylinder deactivation staying engaged longer with the larger V8 and getting better fuel economy as opposed to the smaller V8 engines that was tested. So, if it's truly the best choice for the Corvette, it must still hold true for Camaro with its higher curb weight.
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Old 03-18-2013, 12:55 AM   #33
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I find it entertaing how alot of guys in here think even the ls 5.3 is a peice of garbage in comparison to the ls3, yeah it might not make as much hp and torque stock but really how many guys keep there engines stock? Dont underestimate its potential. I come from a performance trucks background, theres lots of guys getting retarded amounts of hp and tq reliably from the 5.3 that alot of guys could only dream of getting out of there 6.2's, dont get me wrong saying the 6.2 is an inferior engine because thats not the case, the saying "theres no replacement for displacement" stands true even here. But if anything you guys should be excited about the thoughts/plans/rumours of a LT1 5.3 making its way into the 6th gen camaro, because like the ls5.3 Im sure itll have crazy potential! I know I am excited for it!
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Old 03-18-2013, 01:10 AM   #34
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Unless Ford downsizes the 5.0 (which will likely add direct injection and other small improvements for 2015) to something smaller, I don't see the Camaro SS ending up with a 5.3L engine instead of the 6.2. I'd predict anything with less than the current LS3's 426hp is going to be DOA in the planning room for the 6th-gen SS...unless some kind of low cost "stripper" SS becomes available at a lower price point than the current 1SS, which seems unlikely.
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Old 03-18-2013, 07:57 AM   #35
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Quote:
Originally Posted by KMPrenger View Post
Are you serious?

There are 4 cylinder cars that don't get twice the highway mileage of the SS and especially the Vette. Gas mileage doesn't directly correlate to the size of the engine. If you feel it does you have much learning to do my friend.

As for the talk of this 5.3...I don't understand some of the comments here.

First off let me say that I'm not at all convinced the 5.3 will make its way into the Vette OR Camaro.

But lets say it does. Take a look at the Ford 5.0 V8. In truck form, the 2011 model made 360 HP, and that same year it made 412HP in the Mustang. So if Chevy does the same, I don't see why we couldn't have a 375 horse truck version and a 420HP version in the next gen Camaro. It uses much of the same direct injection tech that the current V6 uses, and the LT1 uses, and they both have nice flat wide torque curves....so I'm guessing the 5.3 does as well.

I'd love to see the LT1 in the next Camaro, but I have no doubts that a properly factory tuned 5.3 in the ligher next gen Camaro couldn't stomp on the current 6.2 in this gen.
Thank you you made my point perfectly.
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Old 03-18-2013, 08:09 AM   #36
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Its going to be difficult for the domestic car makers (or any car manufacturer selling cars in the US) to maintain any number of engines that go against the upcoming fleet average of 35 mpg. For the cars that do not meet the requirement, a company will have to buffer them with the majority of the fleet that can meet or exceed the 35mpg benchmark. This fact will dictate that all engine offerings will need to be more fuel efficient, and as the mpg requirement becomes more stringent (by the next decade), IMO it is almost a certainty that the engines will have to be smaller and more fuel efficient. In a nutshell......the future v8s that are left may be smaller than what's being offered now.
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Old 03-18-2013, 08:24 AM   #37
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Think of this, with direct injection there is no potential for detonation, a diesel engine has no spark plugs, it uses high compression to produce heat high enough to burn diesel fuel. You can throw a match in a bucket of diesel and it will go out. Gas explodes. So a high compression gas engine with direct injection could possibly do away with spark plugs. Superchargers and turbos are the future, and so are Over Head Cam engines GM needs to step it up a notch or 2 and get rid of the dinosaur pushrod engines.
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Old 03-18-2013, 09:42 AM   #38
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Dinosaur pushrod engines? Dear god... Go buy a BMW or get educated...
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Old 03-18-2013, 09:54 AM   #39
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Quote:
Originally Posted by CAP'N B View Post
Think of this, with direct injection there is no potential for detonation, a diesel engine has no spark plugs, it uses high compression to produce heat high enough to burn diesel fuel. You can throw a match in a bucket of diesel and it will go out. Gas explodes. So a high compression gas engine with direct injection could possibly do away with spark plugs. Superchargers and turbos are the future, and so are Over Head Cam engines GM needs to step it up a notch or 2 and get rid of the dinosaur pushrod engines.
Dinosaur pushrod engine? you really have no clue what amazing things gm is accomplishing with the pushrod v8 do you? With overhead cam engine you have to rev them out to get any performance at all. Overhead cam engines are actually an older design then a pushrod v8.

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Dinosaur pushrod engines? Dear god... Go buy a BMW or get educated...
Couldnt have said it better
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Old 03-18-2013, 11:34 AM   #40
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(QUOTE) You really have no clue what amazing things gm is accomplishing with the pushrod v8 do you? (A) Yes I do, I was born in 1961, I think I came before the V8.

(QUOTE) With overhead cam engine you have to rev them out to get any performance at all. (A)This makes absolutely no sense whatsoever, it's the same thing as a cam in block. The cam HAS to turn in conjunction with the crankshaft. The placement and the amount of cams is different, the drive is the same. Just a bit more expensive.

(Quote)Go buy a BMW or get educated... (A) Not only foreign cars have OHC I'm, sure there are a few floating around GM, FORD, DODGE already. I need to get educated???? 1 of you is 24 and the other is 26, I was taking apart gas and diesel engines when you were still a lump in your dad's pants.

Ok maybe not a dinosaur, I was born before the V8 so I may be considered a dinosaur LOL.

The pushrod is a weak link, the lifters are a weak link and the valve train instability probably cause more total engine failures than probably any other failure. The OHC engine lends itself to better valve train stability and higher performance, higher revving engines. OHC design is a bit more expensive. But you spend money anyway to make your engines more powerful.

What about the possibility of doing away with spark plugs. Nothing at all was commented on that.

People feel the same about carburetors and fuel injection. Some embrace different technology some don't.
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Old 03-18-2013, 02:50 PM   #41
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The pushrod is a weak link, the lifters are a weak link and the valve train instability probably cause more total engine failures than probably any other failure. The OHC engine lends itself to better valve train stability and higher performance, higher revving engines. OHC design is a bit more expensive. But you spend money anyway to make your engines more powerful.
Sure, they are capable of much higher revs, but what's the point? LS small blocks are already revving to 6500 to 7000 RPM reliably in stock form. Going beyond that to the stratospheric RPM levels that would absolutely necessitate OHC is not practical, and produces driveability problems for daily driver road cars. An engine that runs really well at 8000-9000 RPM is going to be a pig in the RPM range street engines spend the vast majority of their time in.

And what makes a pushrod engine inherently less reliable. I could give you a long list of engines from GM, Ford, and Chrysler, current and historical, that are damn near bullet proof.

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Think of this, with direct injection there is no potential for detonation, a diesel engine has no spark plugs, it uses high compression to produce heat high enough to burn diesel fuel. You can throw a match in a bucket of diesel and it will go out. Gas explodes. So a high compression gas engine with direct injection could possibly do away with spark plugs.
Quote:
Originally Posted by CAP'N B View Post
What about the possibility of doing away with spark plugs. Nothing at all was commented on that.
Exactly how would you do it? Gas and diesel have unique characteristics that make each not suitable to running like the other. Direct injection engines still have to deal with the potential of detonation. They can just run a little higher compression ratio without it happening. Both fuel and air are in the cylinder during the compression stroke. The timing is still determined by a spark plug, unlike a diesel, where only air is in the cylinder during compression, and the injection of the fuel is the timing. Setting up a gas engine to detonate at precisely the right time every time regardless of variables like temperature, load, fuel quality, etc, would be about impossible.

Alternatively, running gas off detonation by timing it like a diesel would have problems, too. Gasoline requires a fairly narrow fuel/air ratio range, while diesel does not. Hence, a diesel runs without a throttle, providing the necessary heat and pressure to run off detonation even at an idle. I think a throttled gas engine idling or under a very light load (basically with a lot of vacuum) would have a difficult time producing enough compression to cause detonation.
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Old 03-18-2013, 03:21 PM   #42
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Maybe I got the concept wrong, as far as I know direct injection is fuel that is injected directly into the cylinder, not the intake port, therefore there is no fuel in the incoming air charge until the injector sprays it into the cylinder. The same way a cam sensor tells the coils when to fire so it could tell the injector when to fire causing the heated by compression air charge to explode. We already use a throttle sensor and electronics to control the air/fuel ratio, the only thing a diesel has different than a gas engine is a governor. Diesels do have throttles. LOL
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