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Rich H
Joined: 10 Jun 2007 Posts: 2665 Location: Preston, Lancs, UK
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Posted: Wed Sep 22, 2010 11:27 pm Post subject: Spark Plugs? |
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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. _________________ 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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924aussie
Joined: 02 Feb 2006 Posts: 1009 Location: Chinchilla Queensland Australia
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Posted: Wed Sep 22, 2010 11:35 pm Post subject: |
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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 _________________ 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
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
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Posted: Wed Sep 22, 2010 11:38 pm Post subject: |
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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... _________________ 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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924aussie
Joined: 02 Feb 2006 Posts: 1009 Location: Chinchilla Queensland Australia
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Posted: Wed Sep 22, 2010 11:56 pm Post subject: |
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Just added some more above _________________ 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
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Posted: Thu Sep 23, 2010 12:07 am Post subject: |
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Thanks
I'll see what I can find. _________________ 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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Smoothie
Joined: 01 Jan 2003 Posts: 8032 Location: DE (the one near MD, PA, NJ)
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Posted: Thu Sep 23, 2010 12:07 am Post subject: |
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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 _________________ "..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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Rich H
Joined: 10 Jun 2007 Posts: 2665 Location: Preston, Lancs, UK
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Posted: Thu Sep 23, 2010 12:20 am Post subject: |
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sounds good.
any ideas why the UK cars haev very cool plugs specced though? _________________ 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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Cedric
Joined: 27 Aug 2004 Posts: 2600 Location: Sweden
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Posted: Thu Sep 23, 2010 2:06 am Post subject: |
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If you want non bling racing plugs that really stands the heat try B8EGV, great for turbo cars... _________________ 1980 924 Turbo
www.instagram.com/garagecedric/ |
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fiat22turbo
Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR
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Posted: Thu Sep 23, 2010 4:41 am Post subject: |
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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. _________________ Stefan
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
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Posted: Thu Sep 23, 2010 5:33 am Post subject: |
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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 _________________ 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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peterld
Joined: 10 Dec 2006 Posts: 946 Location: Noosa Heads QLD Australia
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Posted: Thu Sep 23, 2010 1:15 pm Post subject: |
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+1 to Cedric, or for tamer driving, try NGK B8EV series. _________________ 80/81 932/8 ROW |
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Carrera
Joined: 13 Nov 2009 Posts: 143 Location: Helsinki, Finland
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Posted: Thu Sep 23, 2010 4:08 pm Post subject: |
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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... _________________ 931 S2, 1981 |
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Smoothie
Joined: 01 Jan 2003 Posts: 8032 Location: DE (the one near MD, PA, NJ)
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Posted: Thu Sep 23, 2010 8:58 pm Post subject: |
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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?.. _________________ "..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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Rich H
Joined: 10 Jun 2007 Posts: 2665 Location: Preston, Lancs, UK
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Posted: Thu Sep 23, 2010 9:27 pm Post subject: |
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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! _________________ 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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