What spark plugs are you running?

[Sweep]

As above, I've done a bit of searching and people seem to prefer standard Volvo plugs at various stages of tune?

[M-R-P]

Yep - OE plugs for me and it runs much better than with the Iridium things that were in it before.

[V70 Graham]

+1 for the OE plugs, never had a problem with mine either.

[p fandango]

not sure i've ever changed mine

[jamesy12345]

NGK coppers in mine, on a budget here

edit

see post #107 in my S70 thread

http://www.vpcuk.org/forums/showthread.php?51112-S70-cd-1997/page6

it's a bit boring sorry :)

[abdul]

Standard

[RollingThunder]

I fitted new Bosch Platinum plugs in my V70R (pretty much the same engine as 850R) when I bought it back in Feb, and I've always had an intermittent misfire in this car, regardless of fuel. I put some new Volvo plugs in last weekend, and I have to say its been misfire free since then - but I've probably only done around 300 miles. Not exactly a scientific test, especially given the intermittent nature of the misfire and the limited mileage travelled since, but I think I'll be sticking to Volvo plugs from now on.

[Plodmonkey]

Volvo are the best ones

[Sweep]

Cheers chaps, where do you get them from? Direct from Volvo?

[M-R-P]

Partsforvolvosonline mate.

[stribo]

I run NGK Iridiums, these ones in fact:
http://www.ebay.co.uk/itm/181102633553?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

Hope I can keep them in the engine this time. :D

[Toolbah]

Partsforvolvosonline mate.

Try your main dealer, they can give you a good discount if you press them, I do LOL and cheaper than PFV!!!

[LeeT5]

Fact: Genuine Volvo plugs for model R vehicles are Iridium not Platinum.

Heat Range Explanation

Typically the heat range for NGK Spark Plugs varies from 2-11. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or whether it provides resistance to heating up (cold).

Generally, low power engines such as lawn mowers don’t produce a large amount of heat, hence use a low heat range (or hot) spark plug such as a 4 heat range. This means the spark plug will heat up easily and reach its optimal operating temperature. High performance engines on the other hand produce a large amount of heat, hence a high heat range (or cold) spark plug such as a 10 heat range needs to be used to resist the heat developed by the engine.

Several factors influence the heat range of a spark plug, although typically the insulator nose design provides an indication of the heat range of a spark plug.

When a spark plug absorbs heat produced from combustion, the heat is transferred through the centre electrode and insulator nose to the metal shell, which then transfers the heat into the engine casing and circulating coolant.

A low heat range (or hot) spark plug typically has a long thin insulator nose which will heat up easily however will not dissipate readily to the metal shell (above left). Conversely, a high heat range (or cold) spark plug has a short thick insulator nose which will dissipate heat much easier (above right).

When the heat rating is too high:

The spark plug temperature remains too low and causes deposits to build up on the firing end; the deposits offer an electrical leakage path that gives rise to loss of sparks.

When the heat rating is too low:

The spark plug temperature rises too high and induces abnormal combustion (pre-ignition): this leads to melting of the spark plug electrodes as well as piston seizure and erosion.

NGK Spark Plugs pioneered the use of a copper cored electrode in 1958, which enables a spark plug to heat up quickly and also dissipate heat quickly giving an ultra wide heat range. It is essential to use a spark plug that fits a specific engine and its conditions of use.

As spark plugs are positioned in the head of an engine, their analysis can give a good indication of how your engine is operating.



I use genuine plugs only, for obvious reasons. They tend to also be cheaper than buying from other motor factors or the net.

[960kg]

If one wants to understand Heat Ranges of spark plugs it is nice to know that although NGK heat ranges go from Hotter 2 to Colder 12 and not 2 to 11.....But Bosch go from Hotter 10 to Colder 2 .......the opposite to most plugs.

[jamesy12345]

If one wants to understand Heat Ranges of spark plugs it is nice to know that although NGK heat ranges go from Hotter 2 to Colder 12 and not 2 to 11.....But Bosch go from Hotter 10 to Colder 2 .......the opposite to most plugs.

what he said^^^

25666