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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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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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I just purchased a 1998 volvo V70 wagon. Word to the wise make sure someone checks the starter or electrical system. I am new to the Volvo family. My purchase is only a week old and this morning my car would not start. AAA provided a jump-start. My altenator and battery both checked out fine. It was been on a electrical digital reading device to come out as pass. I did not leave any lights on inside. After the jump my car was just fine. Until I took it out again things was going status quo. It has been at least one hour before starting the car up again and it almost did not start again. Someone suggested a starter problem. This is costing more money then I expected. Any suggestions out there??? 
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Replying to: tamula (Mar 23, 2006 7:35 pm) |
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Replying to: tamula (Mar 23, 2006 7:35 pm) On the way home I stopped and then it wouldn't start. The shop paid for the tow back to their facility. They kept it some more and then announced that it was another module and charged $$ for that. I picked up the car and it started perfectly. I drove it around the block and back to the shop, where I shut it off. It wouldn't start. This time they found that wiggling the ground wire set from the battery while I was trying to start it made the starter go on, and they supposedly repaired a wire. That was a year ago and it had worked ever since. It could have just been a loose connection all the time or it could have been a damaged wire. This is a 92 Plymouth Voyager driven in a hot climate and very poorly maintained by this relative. I had tried to jump across the starter in my diagnosis of the problem, but the starter was buried under the intake manifold on the back side of the engine. I don't know where the starter is on the v70, but you can probably get an aftermarket repair manual and try jumping at the starter relay or starter, or even better across the proper contacts under the steering wheel with the key in the ignition swiched to the run position. But if the problem is intermittant it is hard for an amateur to draw conclusions. On my 91 Spirit the problem was the ignition switch, and on our 96 Volvo 850 wgn it was the starter itself. A shop put in a rebuilt Volvo starter for some serious $$$ and the problem was fixed. My wife later totalled the 850 wgn and got an '04 V70 2.4L base model. Before I changed the ign switch I drove my 91 Spirit for a short while as follows: insert key in the ignition and make sure tranny is in neutral; get out and open hood and using a piece of 12 ga copper house wire momentarily jump across the appropriate contacts on the starter relay, activating starter; shut hood and drive off. If I had killed the engine in stop-and-go traffic it would have been a dangerous situation. Having a car that will not start reliably is an unsafe condition. My nephew had an intermittant non-starting problem with his 2001 Jeep Grqand Cherokee and as I understand it it was nothing more than corroded battery connections, though the dealer charged $280 for towing, diagnosis, a new battery and perhaps new "cable terminations" (?! I wasn't there to get the story from the repair shop.) |
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Replying to: tamula (Mar 23, 2006 7:35 pm) |
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Replying to: jim314 (Mar 24, 2006 12:30 pm) 
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Replying to: tamula (Mar 25, 2006 12:38 pm) I'm now wondering about the supposed bad starter on our 1996 850 wgn. |
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Replying to: jim314 (Mar 15, 2006 9:44 am)
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Replying to: tamula (Mar 25, 2006 12:38 pm)
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Replying to: blckislandguy (Dec 21, 2006 7:34 pm) 
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