V-6 horrible fuel mileage

[LTeddy]

Yep. Modern V6s are delivering power we used to get from small V8s.

I'm glad there's people out there that see that my buddy still claims that the v6 doesn't do that and gm just says it does

[Brian S.]

I've been driving GM half tons since the 1970s.

 

https://en.wikipedia.org/wiki/Chevrolet_C/K

 

Check out the 1987 5.7l 350cu in V8 power specs: 210hp, 280ft lbs torque. Compare that to the 285hp, 305ft lbs torque the new 4.3l makes.

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The best the 5.7l ever did was 255hp/330ft lbs in 2000, is 30hp less and 25ft lbs more a big difference? (especially when you consider the new 4.3l can make 297hp/330ft lbs on E85 and get about the same mpg as that 5.7l)

 

It's not GM "saying i​t" and scamming people, it's the tested power and performance of the 4.3l.

 

I "think" the technology of the new 4.3l and 5.3l is the same as I had in my 2004 Yamaha 150hp VMAX, High Pressure Direct Injection boat motor.

 

Higher compression in cylinders ​coupled with injecting the fuel in a fine high pressure mist yields more complete burn, lower emissions, higher power for engine size. Someone correct me if I am wrong, but I think these motors are using the tech Mercury Optimax, Yamaha VMAX, and Evinrude ETECs have been using for years to make smaller, lighter engines.

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[ember1205]

Here's something else to consider with regard to HP ratings...

 

SAE Net calcuations / ratings were updated about a decade ago to reflect more accurate ways to measure the numbers. These changes resulted in a number of motors that had not been changed at all between model years to show up with LOWER numbers for the 2006 model year compared to the 2005 model year (or similar one year differences). Additionally, some manufacturers used to measure HP off of the motor and now measure at the wheels. And, the numbers at the wheels are lower.

 

So, in a nutshell, it's entirely possible that a motor that measure 300HP ten years ago was measured at the motor. And, by today's measure (and being measured at the wheels) it might actually post a number somewhere around 240HP. So, you can compare numbers all you want. Unless the results were obtained in exactly the same way, using the exact same ratings standards, you aren't comparing like numbers anyhow. If you corrected the older numbers, you'd actually see the the output of today's motors is actually SUBSTANTIALLY higher than those of the past.

[Brian S.]

 

So, in a nutshell, it's entirely possible that a motor that measure 300HP ten years ago was measured at the motor. And, by today's measure (and being measured at the wheels) it might actually post a number somewhere around 240HP. So, you can compare numbers all you want. Unless the results were obtained in exactly the same way, using the exact same ratings standards, you aren't comparing like numbers anyhow

 

Wow, based on Ember's post the 4.3l is actually crushing old small blocks.

[ember1205]

 

Wow, based on Ember's post the 4.3l is actually crushing old small blocks.

 

There's a good chance that, using "normalized numbers", they are. But, the requirements of what it has to be able to do have gone up as well. Trucks are heavier, pull more, carry more cargo, etc.