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Spark Plugs?

 
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Wed Sep 22, 2010 11:27 pm    Post subject: Spark Plugs? Reply with quote

What sparkers are people running?

I have found the following plugs recommended:

Bosch
W3DP / W3DP0

Denso
W24EPU / IW24

NGK
B8EVX

Champion
N2C / N6YC

Any thoughts?

Mine are probably wrong (dunno what's fitted) and I suspect they are causing my pinking problems.
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1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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924aussie  



Joined: 02 Feb 2006
Posts: 1009
Location: Chinchilla Queensland Australia

PostPosted: Wed Sep 22, 2010 11:35 pm    Post subject: Reply with quote

My Haynes book says

non turbo

Bosch ---- WR 6 DS .7mm gap
Beru ------ RS 37 .7mm gap

Turbo

Bosch ---- WR 6 DS .7mm gap
Champion -- N 7 GY .6 mm gap

My Porsche drivers manual '80 says
non turbo


Bosch ---- W 5 D .7mm gap
Beru ------ 14 - 5D .7mm gap

Turbo

Bosch ---- W 3 DP .7mm gap
Bosch ---- WR 4 CS .7mm gap

MY ORIGINAL never used 924 Carrera GT Drivers Manual '81 says

Bosch ---- W 3 DP .7mm gap
Bosch ---- WR 4 CS .7mm gap
Beru ------ 14-4 CS 1 .7mm gap
Champion -- N 3 G .6 mm gap



Alan
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green 924 .. 1980 rego 924PSH
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2003 Challenger / Montery 4WD
1995 Hyundai Scoupe ... sold
1998 Nissan Silvia ... sons back from OS he has taken it
BIG BLOODY MOTORHOME 300zx Sold
1980 Fire truck Sold


Last edited by 924aussie on Thu Sep 23, 2010 12:18 am; edited 3 times in total
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Wed Sep 22, 2010 11:38 pm    Post subject: Reply with quote

Apparently UK spec cars have W3DP plugs listed which seems very odd, much cooler plugs than expected.... I haven't checked under the bonnet yet...
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1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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924aussie  



Joined: 02 Feb 2006
Posts: 1009
Location: Chinchilla Queensland Australia

PostPosted: Wed Sep 22, 2010 11:56 pm    Post subject: Reply with quote

Just added some more above
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green 924 .. 1980 rego 924PSH
1998 Mopar Neon ... sick
2003 Challenger / Montery 4WD
1995 Hyundai Scoupe ... sold
1998 Nissan Silvia ... sons back from OS he has taken it
BIG BLOODY MOTORHOME 300zx Sold
1980 Fire truck Sold
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Thu Sep 23, 2010 12:07 am    Post subject: Reply with quote

Thanks

I'll see what I can find.
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1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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Smoothie  



Joined: 01 Jan 2003
Posts: 8030
Location: DE (the one near MD, PA, NJ)

PostPosted: Thu Sep 23, 2010 12:07 am    Post subject: Reply with quote

Another good question: Is anyone using platinum plugs long term and having any luck? (A few of us have tried them on various cars, and had no luck.)

Currently using WR6DS silver plugs - only because I caught a couple sets on sale some years back..
Also had good luck with copper.

Get yer plug charts here - http://www.924board.org/viewtopic.php?t=26893
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Thu Sep 23, 2010 12:20 am    Post subject: Reply with quote

sounds good.

any ideas why the UK cars haev very cool plugs specced though?
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CÚdric  



Joined: 27 Aug 2004
Posts: 1994
Location: Sweden

PostPosted: Thu Sep 23, 2010 2:06 am    Post subject: Reply with quote

If you want non bling racing plugs that really stands the heat try B8EGV, great for turbo cars...
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fiat22turbo  



Joined: 18 Jan 2006
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Location: Portland, OR

PostPosted: Thu Sep 23, 2010 4:41 am    Post subject: Reply with quote

On other turbo cars I've run, I've found that colder range plugs work better since the turbochargers tend to raise the combustion temps enough that the colder range helps prevent detonation (though at first start, the engine might be a little rougher and you need to let it warm up before getting on it)

For example, the stock plug call-out is RN12YC and I use RN11YC or even RN9YC. You do have to pay attention to the condition of the plugs to make sure you don't go too cold or too hot.

Platinum plugs have tended to shatter the plating off the electrode due to the higher combustion temps and/or slight pinging on the turbo motors I've run. At least the older ones did, not sure if there has been a change in the way the plugs are made to improve this or if the 924 would work better due to differences in combustion chamber design, etc.

Typically, buying good name brand plugs (NGK/Bosch/Champion) and trimming back the center electrode to expose more of the flame kernel and gapping the plugs as wide as possible (again, start small and work your way up until you get ignition problems at WOT) along with good quality wires tends to help a lot. Note: The quality and diameter of the wire and connectors is more important than the outside diameter of the wire itself. Make sure you know the diameter of the actual wire, not just the insulation around it

Indexing the plugs is another area that can help, but requires some fiddling to get right. Basically, you use washers or shims to set the electrode of the plugs to all point in the same direction in the combustion chambers, preferably with the open portion of the plug oriented to maximize the spark's contact with the air/fuel mixture.
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1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Thu Sep 23, 2010 5:33 am    Post subject: Reply with quote

Cheers guys, got myself a couple of different brands I'm going to try out.

Champion N6YC and NGK B8EVX

See how I get on.

Cheers
Rich
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1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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peterld  



Joined: 10 Dec 2006
Posts: 783
Location: Noosa Heads QLD Australia

PostPosted: Thu Sep 23, 2010 1:15 pm    Post subject: Reply with quote

+1 to Cedric, or for tamer driving, try NGK B8EV series.
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Carrera  



Joined: 13 Nov 2009
Posts: 143
Location: Helsinki, Finland

PostPosted: Thu Sep 23, 2010 4:08 pm    Post subject: Reply with quote

I have an orange 924/924 Turbo Service Information booklet.
For the RoW cars the original Bosch plug is W3DP.
The booklet lists WR4CS as an alternative.

I have used the WR4CS as it is cheaper and at least over here readily available. The W3DP is a factory order item...
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Smoothie  



Joined: 01 Jan 2003
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Location: DE (the one near MD, PA, NJ)

PostPosted: Thu Sep 23, 2010 8:58 pm    Post subject: Reply with quote

Rich H wrote:
Apparently UK spec cars have W3DP plugs listed which seems very odd, much cooler plugs than expected.... I haven't checked under the bonnet yet...

S2 comp ratio (8.5:1 Euro-RoW vs. 8.0:1 USA-Can-Japn) could account for your cooler plug spec. -Or are UK cars specifically spec'd cooler than other Euro-RoW cars?..
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Thu Sep 23, 2010 9:27 pm    Post subject: Reply with quote

W3DP are specific UK spec apparently...

I'll see how the Chap and NGK jobbies fair.

I plan on changing leads, dizzy cap adn rotor too.

If that doesn't help I'll turn the fuel up a touch but Id rather not!
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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