Talk:Volvo 850

How to abbreviate United States

The Wikipedia:Manual of Style states:

"When abbreviating United States, please use "U.S."; that is the more common style in that country. When referring to the United States in a long abbreviation (USA, USN, USAF), periods should not be used. When including the United States in a list of countries, do not abbreviate the "United States" (for example, "France and the United States", not "France and the U.S.")."

So, that is what I'll do. -- Charles Gaudette 18:18, 5 June 2006 (UTC)

Trims (US)

Is this part of the article really necissary?--Dahlis 13:47, 31 August 2006 (UTC)

850R Engine tech detail

I got some info off the VADIS at work on the 1996 850R engine. The info is a direct copy and is unedited :)

Engine block:

1.Cylinder sleeves 2.Piston 3.Gudgeon pin 4.Sodium cooled exhaust valve 5.Camshafts 6.Intake port 7.Piston cooling nozzle 8.Piston cooling cover

The engine block has been modified in the following areas compared to the B5254S: -Cylinder diameter is reduced (from 83 to 81 mm) to increase the cylinder sleeve thickness (1). -The reinforced pistons (2) have a smaller diameter and a more concave crown to reduce the compression ratio. The bottom of the pistons have a cut out for the piston cooling nozzles. -The gudgeon pins (3) are reinforced, with for example a smaller center hole. -Exhaust valves (4) are sodium cooled, because if the high temperatures. -Camshafts (5) have lower lift. This gives better idling quality and comfort without reducing the power. -Intake ports (6) are also modified because of the absence of the variable intake manifold. -Outlets in the cylinder block for the piston cooling nozzles (7) and relief valves. These have three covers (8) on the outside of the block. The special spark plugs can tolerate very high temperature and pressure and retain the old service interval. The crankshaft and thrust bearing have been modified to meet the higher loads on the crank mechanism in the turbo engine which also affect other 5 and 6 cylinder engines: -The grooves in the lower bearing are eliminated, raising the oil pressure and providing a better oil film. -The material quality in the big end bearing has been improved, the lead-bronze alloy has been replaced by a more heat resistant aluminum alloy. [1]

Cylinder head

The whole engine is manufactured of aluminum and is divided into five components, where the cylinder head consists of two components and the cylinder block of three components. The seal between the cylinder head and cylinder block is a conventional cylinder head gasket, while the seals between other gasket faces are liquid gasket. There is a cover over the spark plug wells to protect them from dirt and water. The two camshafts are installed in six bearing caps integral to the two halves of the cylinder head. The upper half functions as a combination valve cover and camshaft cover. It has cast oilways on the underside which guarantee good oil supply to the camshafts and the hydraulic tappets. The maintenance free hydraulic tappets, valve springs and valves are in the lower half. The compact "pent-roof" construction combustion chamber together with the V configured valves provide optimal charging and direct (cross-flow) scavenging of the combustion chamber. The combustion chamber squish surfaces and central spark plug give optimum charge combustion, low knock susceptibility and low stable exhaust emissions.

Crankshaft

The crankshaft has six main bearings, of which the 5th bearing is a thrust bearing. At the front end of the crankshaft there are two spline joints of which the inner drives the oil pump. The outer joint carries the timing belt pulley and vibration damper. A dummy spline locates and guides the pulley. The connecting rods are forged and the sawtooth joint between connecting rod and cap locates the cap exactly. B 5254, B 5252 and B5234T are equipped with forged crankshafts which give maximum strength and also contribute to a low noise level. On the B5252 a cast crankshaft will be introduced successively throughout 1993 due to the low power output. The B 5204 has a shorter stroke which means that the crankshaft is more compact. The compact cast crankshaft still retains the strength of the crankshaft in engine B 5254.

Lubricating system

Lubrication system The oil passes from the oil pump to the oil filter which is of the full-flow type. The filter is located directly ahead under the oil pump and seals against the oil sump which is part of the lubricating system.

From the filter the oil is pumped through an oilway in the intermediate section to the main bearings. The oil is then pumped through drilled channels in the crankshaft to the big ends. The camshafts and the hydraulic tappets are lubricated via a drilled channel in the front left edge of the block. The oilway continues through the cylinder head discharging into the underside of the upper half of the cylinder head. From here the oil is pumped via an oilway to the left camshaft bearing and tappets (intake side). The right side camshaft bearing and tappets (exhaust side) are supplied via a cast transverse oilway in the front edge of the upper half. The oil then returns from the cylinder head and the crankshaft bearings to the oil sump via the drains in the block.

Timing belt

A conventional single toothed belt drives both camshafts and the coolant pump. The camshaft timing gear pulley is secured with three screws in each camshaft. The screw holes are oval to ensure the correct location of the camshafts. The timing belt tension is achieved using an automatic belt tensioner. The timing belt tensioner presses on the belt via a lever mounted pulley. The idler pulley on the other side of the belt prevents the belt from oscillating.

Not all trim levels included in this article

Someone please look over them --- The trim section is by far the MOST IMPORTANT section of this article. It should not be overlooked

Mistake in the current trim level description

No Volvo 850's with a turbo came with a manual transmission. The trans axle that came with the car couldn't take the torque from a turbo, and thus only the four speed automatic was available with a turbo. —Preceding unsigned comment added by Computertreker (talk • contribs) 04:19, 6 June 2008 (UTC)

I am sorry that I didn´t register yet, but I have to add: I am driving a 850 T5 which obviously has a turbo and it has a manual transmission. Over here in Europe you will be hard pressed to find 850R versions without automatic transmission, there are very few manuals. The manual transmissions can handle more torque than the automatic, that's why on the T5-R model the manual version has 330nm and the automatic 300 (with overboost).

Concerning the T5-R, there is also a slight mistake in the article. The T5-R was a special version of the T5, adding a 30 second overboost which could be activated by the push of a button, powering the car to 240bhp. The later R models had 250bhp all the time, without any additional overboost features. When carried over to the V70, the R and other turbo models got a remapped turbo response time from the control unit and different turbochargers, so they would be more controllable from a standstill. This leads to higher 0-60 times though and a less sporty feeling. —Preceding unsigned comment added by 217.226.207.134 (talk) 07:49, 3 March 2009 (UTC)

engines?

far from a comprehensive list. i know more articles are basically written for the us market but there are WAY more than 2 engine options. my own owner´s manual will yield 3 that are not here.--Lotsofmagnets (talk) 06:42, 13 April 2010 (UTC)

green T5-R

why is there no mention of it?--Lotsofmagnets (talk) 06:42, 13 April 2010 (UTC)

Fastest wagon 1995?

Wasn't the Audi RS2 also in production during this time? (1994-1995) —Preceding unsigned comment added by 58.69.6.11 (talk) 12:53, 14 September 2010 (UTC)

Volvo 850s built in Canada.

A handful of 850s were built in Canada at the Volvo Halifax Assembly plant from kits. I added the links. Nfjb (talk) 05:30, 18 February 2011 (UTC)

T5-R or T-5R?

What one is right? My guess is T-5R but I am not so sure about that. 85.191.27.236 (talk) 07:47, 19 February 2014 (UTC)

It's T-5R, which is how the badge is presented, and how it appeared in Volvo marketing literature Jamesinc87 (talk) 00:17, 1 February 2018 (UTC)

confusion over times

in the article it lists times of 5.8~6 seconds 0~60 depending on transmission yet in the engine list it's 7.8. This is quite a difference. Which is it? 60.241.11.213 (talk) 16:52, 25 May 2021 (UTC)