GM Planning larger gas engine than the 6.6L

[ksss]

This ought to be interesting.

http://gmauthority.com/blog/2019/02/gm-planning-new-engine-larger-than-new-6-6l-v8-l8t/

Well over 8 liters, that is a lot of motor.

[Me_Again]

FishOnOne wrote:

gbopp wrote:
Is it because of the Ford 7.3 gas engine?

Probably not because of the 7.3, but for the same reason the 7.3 is supposed to be the optimal size for heavy duty use.

Looks like technology is catching up with big bore cylinders. Engines like the Ford 460 and 8.1 GM died back when because they were dirty(think polluting) engines.

V-10's came about because of extra smaller bore cylinders that were easier to control for pollution.

[FishOnOne]

gbopp wrote:
Is it because of the Ford 7.3 gas engine?

Probably not because of the 7.3, but for the same reason the 7.3 is supposed to be the optimal size for heavy duty use.

[Turtle_n_Peeps]

wnjj wrote:

Turtle n Peeps wrote:
As the owner of a 9.4 liter engine there is no way in hell I would have this engine in a truck or MH or whatever.

Just to give you guys an idea how much gas this thing can use:

Just to warm this engine up to 180 degrees for a run= 1 gallon of gas!

To make a 1/4 mile run with burnout and return= 1.25 gallons of gas!

Now I know my engine does not have CD; but still. You better have a fuel tanker in back of you if you plan to tow with this engine!

I'll stick with my old oil burner!

You usually have very spot-on technical comments but this time you're being a little silly. 😉

The amount of fuel burned is dependent upon the effort demanded plus any waste heat. Larger displacement engines doing the same work as smaller ones don't necessarily need to burn more fuel to do it.

If you used your 9.4L engine to tow you'd need one heck of a heavy trailer, a really steep hill or both to keep up that burn rate.

Yes, diesel has more BTU's so will always win the fuel economy debate. I could point you at some modified diesel pulling tractors that can chew through the fuel too.

Also, burning that much gas in a 1/4 mile sounds like a blast!

Point well taken....But:

My point was if you use a big engine for small power it's inefficient because of ring drag, bearing drag, cam drag and all of the rest of the stuff.

If you use a big engine for big power you are going to use a LOT of gasoline! Ask me how I know! LOL

My oil burner puts out 360 HP and with the trailer I pull (11K)I can go WOT on many, many mountains for minutes at a time. When I do this it uses a LOT of diesel! And that is with a diesel that gets 30% better mileage than a gasoline engine.

Now make that a gasoline engine that gets 30% less fuel mileage and then make that engine 425 HP or 475 HP or whatever. This thing is going to use more fuel than an F15 on after burner!

[BurbMan]

Wow a gas engine bigger than 8 liters? Oh wait, I already have one....

[wnjj]

Turtle n Peeps wrote:
As the owner of a 9.4 liter engine there is no way in hell I would have this engine in a truck or MH or whatever.

Just to give you guys an idea how much gas this thing can use:

Just to warm this engine up to 180 degrees for a run= 1 gallon of gas!

To make a 1/4 mile run with burnout and return= 1.25 gallons of gas!

Now I know my engine does not have CD; but still. You better have a fuel tanker in back of you if you plan to tow with this engine!

I'll stick with my old oil burner!

You usually have very spot-on technical comments but this time you're being a little silly. 😉

The amount of fuel burned is dependent upon the effort demanded plus any waste heat. Larger displacement engines doing the same work as smaller ones don't necessarily need to burn more fuel to do it.

If you used your 9.4L engine to tow you'd need one heck of a heavy trailer, a really steep hill or both to keep up that burn rate.

Yes, diesel has more BTU's so will always win the fuel economy debate. I could point you at some modified diesel pulling tractors that can chew through the fuel too.

Also, burning that much gas in a 1/4 mile sounds like a blast!

[Turtle_n_Peeps]

As the owner of a 9.4 liter engine there is no way in hell I would have this engine in a truck or MH or whatever.

Just to give you guys an idea how much gas this thing can use:

Just to warm this engine up to 180 degrees for a run= 1 gallon of gas!

To make a 1/4 mile run with burnout and return= 1.25 gallons of gas!

Now I know my engine does not have CD; but still. You better have a fuel tanker in back of you if you plan to tow with this engine!

I'll stick with my old oil burner!

[Farmerkev]

With the IMO 2020 hitting and expected diesel price hikes coming Janurary next year gas will probably be the winner in low cost per mile even in larger engines.

[kw_00]

Well that’s cool! I’m looking forward in seeing how the 6.6 will do. I’m interested in that truck in the future. I’m sure the big block will be used commercially in the 4500 series and above, plus RV motor coaches as well. Like all the LS series engines it will be a good one.

[gbopp]

Is it because of the Ford 7.3 gas engine?

[FishOnOne]

Makes a lot of sense as we are seeing commercial vehicles transition from diesel to gas.

[ksss]

I think in the mid2000's when the 8.1 was available the take rate was low. However now that diesels have gotten more complex, expensive and due to that complexity less reliable, the gas options is more appealing then it used to be.

[ramyankee]

ParkCountry wrote:
Wasn't it about 20 years ago that GM had an 8.1 Gas engine that they put in their pickups? A guy I worked with bought one for hauling his 5th Wheel and he really liked it. For some reason, though, GM discontinued it. Might've been the poor fuel economy.

I have a 2002 with the 8.1... LOVE IT...

[ParkCountry]

Wasn't it about 20 years ago that GM had an 8.1 Gas engine that they put in their pickups? A guy I worked with bought one for hauling his 5th Wheel and he really liked it. For some reason, though, GM discontinued it. Might've been the poor fuel economy.

[Groover]

Big GM V8, clicky of link above

It seems like it is aimed at Class 7 trucks. My guess more specifically garbage trucks and delivery trucks used in big cities and using CNG for fuel. You lose about 20% of your power with CNG so the bigger engine is needed.