Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine - Page 3

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Poll: New 4500/5500/6500 Medium Duty Gasoline Engine Options

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Thread: Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine

  1. #31
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    Re: Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine

    Quote Originally Posted by Sierra12 View Post
    Ford has wanted to get rid of the 6.8L V-10 for some time because it's an expensive engine to produce. Very high parts count (30 valves as an example). It's also quite large and pretty much it the limit of it's displacement and power. I have never been a fan of the 3 valve Mods, and I got good at replacing them if you know what I mean! The only thing that saved the V-10 from being as bad as the 5.4L 3 valve was that the V-10 didn't have cam phasers.
    208,467 Hard Life kms on my 5.4L 3 Valve. No Cam Phaser Issues, No Spark Plug Issues, No Exhaust Manifold Stud Issues, The only issue was 1 Fuel Pump Driver and that it is Thirsty, but not as the 6.0L GM is. I sold my 5.7L Vortec at 210,xxx and had the Intake Gaskets done twice, Fuel Pump 3 times.

    Regularly Maintained is a MUST for a 5.4L to survive. Also switching from 5W20 to 5W30 above 100,000 kms helps Life Span but hurts Fuel Mileage.
    Last edited by InCogKneeToe; 11-05-2018 at 07:44 AM.

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  3. #32
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    Re: Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine

    Quote Originally Posted by serpico View Post
    450 lb ft of tq is the expected output....BRAVO GM ! Welcome to 2005 ! when Ford`s HD engine put out 457 ft. pounds,

    Disappointing, if this is all we get, especially for a 6500.
    450 is a lot better than 380!

    I think if the Ford V-10 is currently putting out 460lbs and that is adequate to move a 650/750, than GM is fine. There is probably a *lot* more focus on fuel economy and longevity for this engine class than outright power.

    From a competition and marketing point of view, the only concern is the kind of power Ford's new 7.3L gas V8 will be pumping out. Presumably it will eclipse the V10's output.
    2005 GMC Sierra 3500 4x4 C/C Dump 6.0L
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  4. #33
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    Re: Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine

    People are forgetting that CAFE and GHG regulations will soon be affecting medium duty trucks.

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  6. #34
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    Re: Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine

    brothers e350 ford van with the 5.4 has 544,000 miles , few coils,starters,waterpumps and a complete rebuild of the cam drive
    still going

  7. #35
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    Re: Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine

    Quote Originally Posted by Sierra12 View Post
    Know what? I used to drive a 1987 GMC C-6500 with a 366 gas V-8 in it. Truck was loaded to about 80% GVW most of the time (26,000 lbs.). It had about 190 h.p. and 305 ft. lbs. of torque. Did just fine with a 5 speed transmission and a 2 speed axle. Went on the freeway and everything.

    Everyone has become used to these largely fake (due to torque management) output figure of these new diesels in heavy duty pickups.

    That having been said, I am sure whatever gas engine GM eventually offer in the Silverado medium duty trucks will be not only up to the job, but substantially more powerful than that old 366 I used to drive!

    My guess is it will be an all new engine, probably based a bit on the iron block LS with larger displacement and DI.
    Oh yes! Most of the trucks I worked on in the 70's-80's had that 366 big block. They were used for farm, lumber, concrete forms, propane, wrecker, and box trucks. They did the job back then!!!!

  8. #36
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    Re: Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine

    Quote Originally Posted by troverman View Post
    450 is a lot better than 380!

    I think if the Ford V-10 is currently putting out 460lbs and that is adequate to move a 650/750, than GM is fine. There is probably a *lot* more focus on fuel economy and longevity for this engine class than outright power.

    From a competition and marketing point of view, the only concern is the kind of power Ford's new 7.3L gas V8 will be pumping out. Presumably it will eclipse the V10's output.
    Ive been thinking about this and although I think GM had a real opportunity to bring back the large displacement greatness it had with with former 8.1/Allison combo it offered in the early 2000`s I think the extra 75-100 HP will be enough to push trucks like the 4500 LCF and other medium duties to a place where they can be used for more vocational purposes such as AAA flatbed car haulers.

    What I was hoping for was something like a 454, big block power with the modern technology of LS architecture, combo port-direct injection fuel systems like the vette has and Dynamic Skip Fire would edge the efficiency of such a engine to levels never possible with the old gen 7 big block.

    If initial reports are correct it looks like the new engine will use direct injection, this is a good sign as this will make the engine more efficient and make things like natural gas and propane autogas conversions more efficient for govt and fleet use. My 2015 OEM Bi-Fuel (CNG) 2500HD looses 59 horsepower when operating on natural gas, in part because the engine has a base compression of 9.7:1, because it has to be able to operate on 87 octane, if the base compression was closer to 11:1 the HP loss when using CNG wouldn't be so dramatic. I deal with the drawbacks because my fuel cost is only .65 cents per gallon, which certainly beats 3.40 per gallon as of 12/18 here in So-Cal, I also got a 15,000$ discount on my truck when I purchased it new from the dealer as it was a cancelled fleet order that had been sitting on the lot for about 8 months.

    I did tow a 6 person travel trailer from Idaho Falls to Yellowstone and back and although the full 360 HP of the L96 would of been nice it was able to tow the trailer on CNG even through the mountains. Truck was loaded with gear and 4 people so it did surprisingly well under the circumstances. if this 6.6 turns out to be a winner i may look at upgrading, unless i decide to drop in a LSX 454 crate engine, they do come in a 13:1 compression variety, perfect for natural gas at 120-130 octane....hmmmm
    Last edited by serpico; 12-24-2018 at 10:38 PM.

  9. #37
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    Re: Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine

    Latest rumor is that an 8+L is in the works! Might not be available in pickups, all speculation at this point.

  10. #38
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    Re: Chevrolet 4500/5500/6500 Medium Duty Gasoline Engine

    Quote Originally Posted by Sierra12 View Post
    Latest rumor is that an 8+L is in the works! Might not be available in pickups, all speculation at this point.
    Redline in truck application will probably be 4500 RPM

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