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Hybrid Vehicles Chevrolet Tahoe and GMC Yukon Hybrid Chevy Tahoe/GMC Yukon Hybrid
301 messages, Last post on Nov 23, 2009 at 10:58 AM
You are in the Chevrolet Tahoe and GMC Yukon Hybrid Forum. Your Host is pf_flyer
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Replying to: JBaumgart (Nov 02, 2007 7:46 am)
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Replying to: kylechoffman (Nov 02, 2007 11:35 am) The Prius also came with a low MSRP but the DEALERS were gouging customers with large markups.
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Replying to: larsb (Nov 02, 2007 1:46 pm) |
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Replying to: JBaumgart (Nov 02, 2007 7:46 am) I talked to a local dealer he said the same thing. I haven't heard anything official from GM. GM has a product brochure for the hybrid. As for the price, it sounds encouraging. This one is at the top of my list.
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Replying to: galvang (Nov 03, 2007 11:13 pm) |
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I haven't read all the posts on this new tahoe, but I want to say something about the mechanical aspect of an 8 cylinder motor that shuts off 2 or 4 cylinders at any point during it's running time or it's heat cycle. Any internal combustion engine creates a lot of heat. All the parts of an engine go through a heat cycle where they expand and contract. A part that is round at room temperature is not round at 300 degrees. The reason I say this, is this; the cylinder bore that the piston goes up and down in is supposed to be round;;it's machined that way. The way it stays round is this,,there is holes drilled around the round cylinder which pass coolant or antifreeze through, thus evenly cooling the round cylinder bore that the piston lives in. In the chevy v8 the cylinders are set up in two rows of four. If you shut off 2 or 4 of these cylinders these cylinders will become unround or oval shape because of the heat that will be transfored from the cylinders that are working and creating a lot of heat. If you think the intake gasket leak problem on all chevy tahoes was bad wait until you see entire motors failing. I will say it will take about 50,000 or 60,000 miles and you will see severe engine damage and catistrofic engine failure....This motor is destined for the discovery channels'show "engineering failures"
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Replying to: pear69 (Nov 07, 2007 10:26 pm) I think your analysis has some good theory behind it. This is not a new way of trying to save gas. Honda has a V6 in their Odyssey and not sure what else with VCM. I have not read of any early failures yet. I am a keep it simple kind of guy so I would probably not be interested in such an engine. |
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Replying to: pear69 (Nov 07, 2007 10:26 pm) I don't think this will be a problem. The cylinders deactivate and reactivate continuously. I suppose in theory if one was going down a VERY long slope the cylinders might shut down for a few minutes, but in general the problem most people have always had with variable cylinder usage is that they don't shut down frequently enough to really help MPG. The moment extra power is required, even momentarily, the cylinders come back on line. However, this marks the first use in hybrid applications, so maybe they will shut down more. But considering the heavy weight of the Tahoe, it is very likely that all cylinders will be active much of the time. Also, we don't know how Chevy programmed the engine. It may well be that it is not the SAME cylinders shutting down - they may alternate, which spreads the heat around.
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Replying to: stevedebi (Nov 08, 2007 12:11 pm) I agree above, “Cylinder deactivation” is only on when the engine is in very light loading conditions (going down hill, cruising on the highway. etc). So heat being generated is pretty minimal. If the vehicle is towing or if the vehicle is accelerating, the internal engine software will activate all of the cylinders and the heat distribution in the engine will be some what even. . To this day I have not heard any latent catastrophic failures with the 5.3LV8 engines. I checked NHTSA and their defects website and it shows nothing. Also GM has a 100K mile powertrain warranty which covers the engine for that length of mileage. They wouldn’t guaranty the life the engine if they had some real test data that didn’t support it. If the engine fails you could always have it replaced. So I wouldn’t worry about it. I received official notice that GM has pushed out the Hybrid Yukon till early next year. Must be having some sort of problem. 
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Replying to: galvang (Nov 08, 2007 6:49 pm) (The GMC site doesn't list the weight of the Yukon, but I'm guessing it is 5500 lbs or maybe more...) I actually wonder if the "problem" isn't that this class of vehicle is too heavy for hybridization to provide a real benefit, other than shutting down the engine when stopped. That is what happened to the hybrid pickup - no real MPG savings. Of course the pickup had the 110v electric capability which may have been useful to some owners. Dual mode doesn't provide as much benefit to a large and heavy vehicle; the electric motors deplete very quickly due to the large amount of weight that has to be accelerated. With heavy vehicles the situation degrades to the point that it would take too much battery to provide enough boost, and then one has to remember that the battery adds weight and takes up room as well. AND hybrid components are complex and expensive. Some people assume that LiIon batteries will be the answer, but I'm not convinced that the recharging/heat problems of this technology will be overcome any time soon. |
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