20V Spark Plug info

[Argon]

Car has had fuelling problems of late and it is going to be necessary to change sparkplugs for a bit of "extra for experts" type of fussiness once the problem is fixed on friday as they have are now really black as a result of obviously being caked in fuel and fouling. The plugs in the car are NGK-R, Iridium electrode type plugs with what seems to be a big gap setting.

Question is, what is the factory plug gap setting for a Silvertop 20V?

Who here is a big fan of iridium or platinum plugs? I know they last longer, but the price of them dictates that they should. I think I'd as sooner have cheaper generic (good ol' Champion Gold) plugs and be inclined to check and replace more often.

What heat range plugs are people tending to be running with generic 96 Octane fuel??

Any information on this stuff would be cool, save time and money pissing around with useless combinations.

[matt dunn]

Dont run Champion plugs in a japanese DOHC as they will not give good results.

Thats what I have found anyway.

I have a 20V turbo with around 300hp and run 20 psi and run the exact plug the NGK book list's for the engine, minus the -11 suffix on the end which is 1.1mm gap, as I run the 0.8mm which has no suffix.

The Platnium plugs are self cleaning so foul less often and on engines where the plugs are hard to get to it helps.
I dont believe that the champion range is wide enough,
as quite often there are about 10 or 15 different NGK plugs that will all cross over to 1 champion plug.

I have heard of good engine tuners who swear by the exact opposite of what I believe, and I dont believe there is a right or wrong, but that's my view.

Matt

[Argon]

Cool Matt, not saying that Champion Golds are at all good, but a pretty good example of a plug that has stayed exactly the same for 25+ years and is reliable at a cheap price. Turbo setups are a different kettle of fish though when it comes to ignition spark and are a bit more demanding than the operating conditions of an N/A engine, so I guess that it's probably a good idea to go for something good there.

[Mr Revhead]

well on a stock 20v the stock plugs are the best i reckon...
denso pk20r11 or ngk bkr6ep11
they are platinums with 1.1mm gap.
unless youv made semi serious mods i see no reason to run anything else

[TrouserFxGt]

going to keep the car long enough to out last a set of normal plugs?

If not get normal plugs.

If so get the platinum plugs.

[20vpsi]

you need to run something thats going to handly the heat range that the engine is putting out