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plugs

anyone using the 12mm plugs for the second set of plugs?? I am going to order a set here pretty quick but curious what others run what they have found to work best Thanks
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Ben

Current project 73 914-6 Gt project rusteration 2.4
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Old 01-20-2007, 06:46 PM
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I just had all of mine changed. It had Bosch's in it, but they were too big and tough to get in and out due to clearence issues.

I think they are Bosch W4CS's to be honest. They are on the cool side.

Bill
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Old 01-20-2007, 08:02 PM
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My car is twin-plugged, but I have 14MM plugs all the way around. FWIW, I'm running Bosch Silver W4CSs in mine. They are slightly hotter than stock, which is W3DPO. So far so good. I've heard that Bosch plugs in the 3 heat range are too cold for our engines...on the street that is. A race car might require a colder plug, but even then I've heard of racers running the W4CS with good results. I think Craig911 runs W2CS (colder) in his race car.
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Last edited by sand_man; 01-21-2007 at 04:00 AM..
Old 01-21-2007, 03:56 AM
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A good discussion:
Spark plug & gap - yours?
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Old 01-21-2007, 03:58 AM
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I've always run W3DPO in my car (street only) and I find they are too cold and foul up too quickly. I'm about to go with W4CS and will see how they go. Geoffrey from Rennlist recommended them. He uses those in his track car and has for many years.
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Old 01-21-2007, 12:13 PM
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Merv,

The guys at Imagine Auto recommend them for my car as well, after they listened to what had been done.

Bill
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2003 996TT
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Old 01-21-2007, 12:50 PM
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I'm hoping the W4CS's will last significantly longer than the DPO's and provide better street performance... damn those DPO plugs are expensive
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 01-21-2007, 03:05 PM
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We have had good luck running plugs like NGK R5671A-(7,8,9,10)

its a 14mm plug with 5/8 hex for the wrench.. so you dont have the interference problem like when you try to use full size plugs for the lowers
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Old 01-21-2007, 04:42 PM
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I have also heard the NGK's are a good cheaper plug.

You do need a good plug if you want to run the larger plug gaps with an aftermarket CDI unit(s).
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 01-21-2007, 05:31 PM
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nonody is running 12mm??
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Current project 73 914-6 Gt project rusteration 2.4
Reproduction 914-6 oil tanks, 1-5/8" 914-6 heat exchangers source call 2623647426 or email mbconsulting21 @gmail.com
Old 01-21-2007, 06:08 PM
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We used to have the heads machined for 12mm...We decided 14mm was better because of more plugs available that fit
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who are those guys? <<< ( Butch Cassidy and the Sundance Kid)
Rent a GT3RS from us!! Call or e-mail.
Transportation and Track support
Rudtners Racing

'69 911 GT-5
'75 914 GT-3
Authorised Haltech seller and installer
Authorised Unichip installer
BBS wheels
Fikse wheels
Redline motors oils
Swepco
1500 hp chassis dyno
Old 01-21-2007, 07:01 PM
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My second plug is 12mm. I'm using NGK BPR8ES for the upper plugs and DPR8EA-9 for the lower plugs.
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Old 01-22-2007, 10:31 AM
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Quote:
Originally posted by 125shifter
My second plug is 12mm. I'm using NGK BPR8ES for the upper plugs and DPR8EA-9 for the lower plugs.
Why different plugs for upper and lower?
Old 01-22-2007, 11:01 AM
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The relief around the larger plug seamed rather large so I chose the smaller plug to minimize the material removed from the combustion chamber. I'm guessing it saved about 1cc.
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Old 01-22-2007, 01:30 PM
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Quote:
Originally Posted by TimT View Post
We have had good luck running plugs like NGK R5671A-(7,8,9,10)

its a 14mm plug with 5/8 hex for the wrench.. so you dont have the interference problem like when you try to use full size plugs for the lowers

Hi Tim,
I've been advised by my Tuner to get R5671A-8's. I'm running BP7ES presently because I was just tired of Black plugs over the years. What is your experience with the 8 heat range?

Les
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Old 01-02-2008, 06:52 AM
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