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Which spark plugs to use

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karmannghia60 Karmann Ghia Sucker

1,459 posts · joined Aug 2002 ·

#828706
My engine is a twin port 1880 with a single 34PICT cabry
It is running W8AC plugs but someone also mentioned that I could use W6BC plugs which is slightly longer reach. Any benefit of using W6BC or will it just run hotter?
Raf

ian.mezz I never said, I could write or spell

3,913 posts · joined Sep 2004 ·

#828743
if the w8ac running a bit black , try w10ac and drive your car more.😂
😂🤪😂🤪😂
car forums. where a lot of peoples good intentions end up taking a good old car off the road forever never ever to see the road again. 🥲

grumble Son of Jim - Creator of Good

2,672 posts · joined Jun 2008 ·

#828770
karmannghia60 wrote:My engine is a twin port 1880 with a single 34PICT cabry
It is running W8AC plugs but someone also mentioned that I could use W6BC plugs which is slightly longer reach. Any benefit of using W6BC or will it just run hotter?
Raf
Watch out for any plug with a longer reach,we had a lot of trouble over the years with threads protruding into the combustion chamber,carbon builds up on the protrusion and you are in trouble,stick with Ian's suggestion.

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 ·

#828861
what is the difference between the W8 and the W10AC plugs?

I've always run W8's and have always had them come out a bit black

Cheers

Shaun
BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

Sides Veteran Volks Folk

2,220 posts · joined May 2007 ·

#828874
The number is the heat range... with Bosch a higher number means a hotter plug, while NGK it's the other way around (lower number means hotter plug).

Hotter plugs draw more heat away from the combustion chamber... so the tip of the plug itself is hotter, which makes it less prone to fouling.

It's not just a case of running real hot plugs tho... the hotter a plug runs, the more prone it is to pre-ignition.

The trick is all about finding the right plug for a given engine and usage.

👍

A few of the guys I race with carry 3 heat ranges of plugs in their spares box... basically shorter events (like hillclimbs with lower engine temps and more risk of fouling) they run hotter plugs than say sprints or multi-lap races where the engine comes more up to temp (and so a greater risk of pinging)

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grumble Son of Jim - Creator of Good

2,672 posts · joined Jun 2008 ·

#828875
sander288 wrote:what is the difference between the W8 and the W10AC plugs?

I've always run W8's and have always had them come out a bit black

Cheers

Shaun
In the days of leaded fuel the ideal colour was grey,this showed a good fuel/air mix,with unleaded fuels black is the colour with experience you come to know the extent of the black colouring.The heat range has a lot of control over this.

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 ·

#828949
karmannghia60 wrote:My engine is a twin port 1880 with a single 34PICT cabry
It is running W8AC plugs but someone also mentioned that I could use W6BC plugs which is slightly longer reach. Any benefit of using W6BC or will it just run hotter?
Raf

I'd stick with the W8AC plugs....

Millions of them have been used...

many people say NGK plugs are better than Bosch... ??

I've always used German Bosch or BERU plugs... in VWs..

its difficult to get a nice clean plug unless you are driving long distances...

and You can't get a nice grey plug now as all the Lead has been removed... was easy in the olden days...
😂
LEE



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