2021 Silverado 2.7 WT

[Art Gregory]

I forgot, My trip average with trailer unloaded and loaded for

224 miles was 15.6 mpg Very impressed with low end power !

 

[the wanderer]

2 hours ago, Art Gregory said:

I forgot, My trip average with trailer unloaded and loaded for

224 miles was 15.6 mpg Very impressed with low end power !

 

 

I asked this before but nobody has given me an answer yet   

What are the RPMs sitting at if you are towing at, say, 65 MPH?

[Art Gregory]

Before you buy the 4.3 Did you know it has no trans cooler

and you cant get one I bought a new 4.3 in 2015 Pulled my trailer ok

transmission was always hot this 2.7 is crazy it pulls my car trailer

every week loaded around 7-8 k total weight as good as my 2019 eco diesel

I sold when I bought this my regular cab 2.7 is the best tool in my tool box

Time will tell if its any good I'm going to find out !

[Art Gregory]

In tow haul mode that is 7th gear 1900 rpm @70

[Art Gregory]

The 2.7 engine has a standard engine oil and transmission cooler 

Never over 210 trans temp loaded.

[Grumpy Bear]

On 4/5/2021 at 9:16 AM, the wanderer said:

 

 

When you're truck is running at 3000 rpms, it's not making 285 HP, it's making far less, about 170 HP. 

 

 

Actually it's only making about 50 hp. It only makes what it needs to overcome the load applied. A little thing called throttling. A dyno graph is made at WOT. Do you drive at WOT? No...so it matters not day in and day out. It's when you hook a load. And when you do guys with big motors are crying MORE HORSPPOWER because speed pulling to them is more important than absolute torque and guys with little motors are crying MORE TORQUE because ability to even pull the load matters more. 

 

It's dizzy how you guys swap back and forth to argue a point that is pointless. You can tow whatever the truck will tow with a 60 hp flathead Ford or a Stovebolt SIX. The world was built with such motors. Wars were fought using Cadillac flathead V8's in tanks during WWII and beyond. 

 

So guys with a 6.2 say YEA I can tow 10,000 at 70 mph up the IKE and guys with little motors say I can tow up the IKE. Both get over the pass and so will a LV3.

 

It isn't about 'better' or 'worse'...it's about appropriate matching of ability to need. 

 

So whatever floats your boat kids. Keep drinking the GM Kool-Aid. 

 

 

[Grumpy Bear]

2 hours ago, Art Gregory said:

Before you buy the 4.3 Did you know it has no trans cooler

and you cant get one I bought a new 4.3 in 2015 Pulled my trailer ok

transmission was always hot this 2.7 is crazy it pulls my car trailer

every week loaded around 7-8 k total weight as good as my 2019 eco diesel

I sold when I bought this my regular cab 2.7 is the best tool in my tool box

Time will tell if its any good I'm going to find out !

 

You didn't look very hard. I have a 4.3 and it indeed has a cooler. Right in the radiator cold side like automatic transmissions have since about 1960. Yes they ran hot. Some moron decides to put a thermostat in them. I flipped the pill and she runs like they did since 1960. Cool as the other side of the pillow

 

2 hours ago, Art Gregory said:

The 2.7 engine has a standard engine oil and transmission cooler 

Never over 210 trans temp loaded.

 

That should concern you. When pulling heavy the converter is unlocked and flashing about 75-100 F higher. Not so when just motoring with the converter locked up. Call SONNAX or Circle D and PATC and ask what the maximum pan temperature should be. I'll bet you get the same answer from all of them. 180 F. They are tying to keep it alive. The OEM is trying to get MPG. 

[Asiafish]

The 2.7 in an SLE or Elevation 4X4 is probably my next truck.  I had a 5.3L 2014 and test drove the 2020 2.7 and except in raw acceleration the 2.7 just felt more powerful in most normal driving situations.  It could be the engine, could be the 8-speed vs 6-speed transmission, but most likely its how both work together.

 

[Trevor Towers]

On 3/26/2021 at 7:32 AM, Grumpy Bear said:

Actually I don't. I'm old my friend. First truck motors of my experience were all Straight sixes with a smattering of flat head Fords. Fact is the countries infrastructure and commercial trucking were built with the straight six and flat four.

 

Real men don't use a chainsaw to cut down a tree. They chew it off at the root. 

 

On a more serious note, the fact it is a four means nothing. The fact that the BMEP needed to make those numbers on 93 octane fuels puts them a few misfires from the scrap heap. 210 BMEP is Formula 1 territory and that on race gas. The blown hair driers are 50% over that. If they put the much effort into the 4.3...oh man.....and the mileage it would get. Lord....

 

But hey, people are in a hurry so sure lets do this....I'll wait and see  

BMEP is a simple measure of torque per liter. BMEP is high because we have a really small engine producing a lot of torque thanks to long stroke/forced induction/moderate compression/high VE. This isn’t a new concept, the 2.7L is not walking on a tight rope of potentially grenading at any second. You are being misleading, and I’m not sure if it’s intentional or not. Without writing a thesis, I can tell you that when you benchmark this engine. It sits right between a Toyota Tacoma and Mustang GT and well below previous and current gen F1 engines in terms of BMEP. It’s like a mild-performance engine, which is still extremely easy to engineer to be reliable. 

[Grumpy Bear]

10 hours ago, Trevor Towers said:

BMEP is a simple measure of torque per liter. BMEP is high because we have a really small engine producing a lot of torque thanks to long stroke/forced induction/moderate compression/high VE. This isn’t a new concept, the 2.7L is not walking on a tight rope of potentially grenading at any second. You are being misleading, and I’m not sure if it’s intentional or not. Without writing a thesis, I can tell you that when you benchmark this engine. It sits right between a Toyota Tacoma and Mustang GT and well below previous and current gen F1 engines in terms of BMEP. It’s like a mild-performance engine, which is still extremely easy to engineer to be reliable. 

 

So.........."Everyone is doing it". That's the defense? 

 

You have read the control strategies for this motor, right? 

 

It's true! Everyone IS doing it. Enough so that oil blenders are pulling detergents from the oil that feeds them. Because?

What does detergent do?  Every motor, need it or not, gets to live with this oil. They are pulling antioxidant from the oil as well. What do these do? Every motor, need it or not, gets to live with this oil. 

 

IF this motor does not live on the razors edge requiring special chemistries to survive then I've lost site of the line. 

 

Really, a special brew to keep if from detonating itself to destruction.

LSPI 

 

And while we are pulling the chemistry from the oil we are telling people lies

Sealed for life fluids

Extended OCI motor oil

Special Licensing oils

A quart in 2K is "normal"

These fellas can't keep rings sealed in a motor, a transmission functioning, cams and lifter alive, vibration out of the driveline. And so bad at it they argue in court,

 

'We don't warranty poor design, just workmanship and materials". 

 

I bought the simplest thing in the toy box and it will remain that way

K.I.S.S.

 

I can not imagine the beating my dad would have given me for telling him,

"But dad, all the kids do it!

Jumping off that 30 foot cliff into two feet of water is perfectly safe"

 

 

 

But I'll tell ya what, do what ya got to do and we can agree to disagree. Okay?

Edited July 20, 2021 by Grumpy Bear

[f8l vnm]

And on que Grumpy is back!  ( into the 2019+ section , which he does not even own a T1) to derail another thread because he has to somehow convince us his mighty 4.3 is superior to everything.  The 4.3 was such a strong motor , GM discontinued it. Nuff Said" 

Look i got nothing against the 4.3 but the 2.7 is superior in everyway .