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914World.com _ 914World Garage _ Bosch sparkplugs in a 914/6GT

Posted by: tomburdge Aug 9 2006, 01:28 PM

I removed the plugs out of my GT (yes I am the proud owner of a real factory built one) and found Bosch plugs designated XR4CS. These are a strange breed to me.I think they are copper,resistor type,and fairly cold.But why the "X".Could it be because its twin plug, the projection into the combustion chamber must be limited or of special design?

If anyone has anyknowledge or thoughts please let me know.I'm not even sure if you can buy these anymore.Can anyone cross reference these over to another brand?

BTW for those of you who knew Gary Wigglesworth,I'm the guy who bought his GT.As most of you probably know by now,Gary passed away in February. I've vowed to remain a good steward of this piece of racing history for all to enjoy.

You can see the car at the "Zippo" at the Glen in September.If you attend please stop by and say hello.
Thanks
Tom B.

Posted by: Bleyseng Aug 9 2006, 02:03 PM

"Two choices available the standard X5DC replacement plug and a one step colder XR4CS plug. XR4CS recommended for track use or high output motors." from www.bimmerworld.com/html/bosch-spark-plugs.htm

www.rockauto.com has them listed.

Posted by: ChicagoPete Aug 10 2006, 10:47 AM

Hi Tom, Nice to see you on the board. Sorry I cannot help with your problem...but, was thinking that if you had any recent photos of your car you should email them off to Armando. Glad to know that another of these rare beauties is staying on the track.

Do you have any idea of what has become of Translog? I know that Gary also owned another 914/6 and a completely original dealer kit to build your own GT. At the time he was selling your car he was also offering the other one.

Posted by: tomburdge Aug 10 2006, 05:30 PM

Hi Chicagopete,Thanks for responding. Translog still exists and is being managed by a fella named Tony ? who was Garys right hand man.I think the business still belongs to the family.Armando does have pictures of my car on his site,but I should send him some of the historical ones I have gathered.I am trying my best to ensure the car remains as original as possible.She is not perfect ,but thats OK with me because I don't think a race car should look like a garage queen.It should look as it did when it was raced.Some people would disagree but thats OK.
I've had her out at several events,albeit very carefully.No need to drive 10/10ths and but the car at risk.
Thanks again for your interest.
Tom B.

Posted by: Jeroen Aug 10 2006, 05:40 PM

can you post some pics of your car here
(or post a link to the pics of your car on Armando's site)

Posted by: Eddie914 Aug 10 2006, 06:48 PM

Bosch X5DC?

My other 6 cylinder German car (1988 BMW M5) uses the X5DC.

Interesting spark plug.

X = M12x1.25 with 17.5mm (11/16") hex head
5 = Heat range
D = 19mm reach
C = Copper

Try to find an 11/16" spark plug socket at your local FLAPS ... or for that matter the X5DC.

Eddie

Posted by: Eric_Shea Aug 10 2006, 07:20 PM

Posted by: Flat VW Aug 10 2006, 07:42 PM

John

Posted by: Gustl Aug 10 2006, 10:39 PM

QUOTE(Jeroen @ Aug 11 2006, 01:40 AM)

can you post some pics of your car here
(or post a link to the pics of your car on Armando's site)

well, that's easy ... I thought an Admin could post a link

(sorry Jeroen)

http://www.pbase.com/9146gt/daytona_winning_9146_gt

Gustl

Posted by: TimT Aug 10 2006, 11:06 PM

Tom welcome to the club,

that sounds like a lower plug correct?

http://home.att.net/~ngkaz/wsb/Master_Cross_Reference_Charts4.xls

Ill have to look in the shop but we have a car that uses 12mm lower plugs.

We now advise all customers that want to twin plug to have the heads machined for 14 mm plugs.. we currently use NGK R5671A-8 as lower plugs

Posted by: ChicagoPete Aug 11 2006, 07:19 PM

QUOTE(TimT @ Aug 10 2006, 09:06 PM)

TimT...you are advising using 14mm lower plugs, but, don't you find you have clearance problems with the bigger plugs during removal and replacement?

Peter

Posted by: TimT Aug 11 2006, 07:51 PM

QUOTE

you are advising using 14mm lower plugs, but, don't you find you have clearance problems with the bigger plugs during removal and replacement?

The NGK plugs we use are 14mm thread, with 5/8 hex so there are no clearance problems. If you were to use a full sized plug 14mm with 13/16 hex you can run into clearance problems with the head nuts and socket.

We found its much easier to source 14mm peanut plugs that work, than to sesarch around for rare 12mm plugs

Posted by: Jake Raby Aug 11 2006, 08:51 PM

Nice to see you here, Tom!

Tom has another 914- MassIVe powreed 914-4 that competes in F production in the northeast...

Posted by: sixnotfour Aug 11 2006, 09:20 PM

12mm both holes , factory race head, would be interesting to know what you got there.
Gary Wigglesworth RIP, the pano article about buying the burned race car a classic.

Posted by: tomburdge Aug 13 2006, 01:44 PM

Thanks everyone for the "welcome aboard" plus your interest in my 'GT".

For those of you interested I will try to post some pic's of the GT both current and historic.Give me some time though as I am not very computer savy.I guess my "cut and paste" skills are no longer applicable in todays world.

Again the GT will be at the "Zippio"at the Glen and also at the PCA race in Daytona come Oct.Hope to see you there..

Tom B.

Posted by: So.Cal.914 Aug 13 2006, 02:51 PM

Congrat's on the car and welcome.

Posted by: tomburdge Aug 17 2006, 08:15 AM

QUOTE(sixnotfour @ Aug 11 2006, 07:20 PM)

12mm both holes , factory race head, would be interesting to know what you got there.
Gary Wigglesworth RIP, the pano article about buying the burned race car a classic.

What I have here is Carrera 6 motor used in the GT's. Twin plug, solid lifter puttung out 220hp at 8000 rpm.

Posted by: ptravnic Aug 17 2006, 08:30 AM

Good to see another Metro NY on the board. We have gained some momentum in the past 6 months or so. A few of us are even getting together the 26th to swap the heads on my 2056cc at a shop in Lyndhurst.

Take a look @ this thread for more background:
http://www.914world.com/bbs2/index.php?showtopic=57889

And,

-pt