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Wagons Volvo V70 Volvo V70 Maintenance & Repair Volvo V70 Engine Issues
79 messages, Last post on Oct 07, 2009 at 7:34 AM
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Having a problem under the hood of your V70? Post your questions and solutions here.
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My 99 Volvo V70 station wagon with 89,000 miles would not start last week and was towed to the dealership. They advised me that the belt tensioner had broken and subsequintly bent one of the cylinder heads. I am looking at very expensive repairs and was not sure of my options. Has anyone experienced this problem?
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Replying to: tread1 (Oct 26, 2005 11:33 am) Whats youe location. |
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Replying to: tread1 (Oct 26, 2005 11:33 am)
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Replying to: navy98 (Dec 01, 2005 5:59 pm) I would say something is up and they must be seeing early failures. Of course, Volvo would never recall? |
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I'm trying to figure out if there are significant drawbacks to using regular gasoline with the 2006 Volvo 2.4 I5 engines (non turbo). My understanding is that the turbos do require premium. Correct? Currently have an 04' S60 2.4 that we fill up with regular and it seems to be doing ok. Now that we're looking at getting the V70, the question of engine type has come up and the associated gas requirements. Do the volvo engines burn one grade of gas cleaner then the other? Any input or direction would be appreciated. Cheers.
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Replying to: va4lvrs (Mar 08, 2006 6:08 pm) |
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Replying to: va4lvrs (Mar 08, 2006 6:08 pm) |
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Replying to: jrkont (Mar 09, 2006 4:29 pm) If the octane requirements are determined by the CR, the the non-turbo enigine has the highest octane requirement. (I understand that the effective compression ratio can be different from the nominal one depending on the valve timing, but I'm assuming this is not in effect here. Page 84 of the manual states that, "Volvo engines are designed for optimum performance on unleaded premium gasoline with octane rating AKI 91. . . . The minimum octane requirement is AKI 87 (RON91)." I believe the AKI octane number is what is given on the pumps. So Volvo is not rulling out the use of regular unleaded. What I get from this is that these cars can be driven hard with AKI 91 fuel and probably the knock sensor would not detect any knocking which would initiate retardation of the timing. Even if you used AKI 87 and drove it hard the knock sensor should protect the engins from knock damage, but you might not get full horsepower or as high a mpg. My dealer however, recommends premium which in the Dallas area is AKI 93 octane, which costs 20 cents a gallon more than AKI 87. AKI 91 is not sold here, but 89 is. Probably our V70 would run fine on 89 or even 87, but we use 93 to "be safe". The extra money is not worth the worry. The next trip I may mix 93 ande 89 to get 91 and see if the highway mpg is different. With 93 we get 30 to 31.5 mpg on the highway at 70 to 75 mph with the a/c on. |
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Replying to: jim314 (Mar 15, 2006 9:44 am) From Wikipedia: "The Atkinson cycle engine is a type of Internal combustion engine invented by James Atkinson in 1882. The Atkinson cycle is designed to provide efficiency at the expense of power. The Atkinson cycle allows the intake, compression, power, and exhaust strokes of the four-stroke cycle to occur in a single turn of the crankshaft. Owing to the linkage, the expansion ratio is greater than the compression ratio, leading to greater efficiency than with engines using the alternative Otto cycle. The Atkinson cycle may also refer to a four stroke engine in which the intake valve is held open longer than normal to allow a reverse flow of intake air into the intake manifold. This reduces the effective compression ratio and, when combined with an increased stroke and/or reduced combustion chamber volume, allows the expansion ratio to exceed the compression ratio while retaining a normal compression pressure. This is desirable for improved fuel economy because the compression ratio in a spark ignition engine is limited by the octane rating of the fuel used. A high expansion ratio delivers a longer power stroke, allowing more expansion of the combustion gases and reducing the amount of heat wasted in the exhaust. This makes for a more efficient engine. The disadvantage of the four-stroke Atkinson cycle engine versus the more common Otto cycle engine is reduced power density. Because a smaller portion of the intake stroke is devoted to compressing the intake air, an Atkinson cycle engine does not intake as much air as would a similarly-designed and sized Otto cycle engine. Four stroke engines of this type with this same type of intake valve motion but with forced induction (supercharging) are known as Miller cycle engines. Multiple production vehicles use Atkinson cycle engines: Toyota Prius hybrid electric (front-wheel-drive) Ford Escape hybrid electric (front- and four-wheel drive) Toyota Highlander hybrid electric (front- and four-wheel drive) Lexus RX400h hybrid electric (front- and four-wheel drive) In all of these vehicles, the lower power level of the Atkinson cycle engine is compensated for through the use of electric motors in a hybrid electric drive train. These electric motors can be used independent of, or in combination with, the Atkinson cycle engine." |
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