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Jun 07, 2011 6:43 pm
Peter S30 Offline
Global Moderator
Registered since: Nov 27, 2007
Location: Germany


Subject: DB Lagonda spark plug caps
I am searching for a supplier for the straight spark plug caps for my DB 3ltr. They have to fit into the rubber covers so outer diameter should be 16-17mm or less, length 63mm, the ones I have (one is cracked and I want some spare) are 1kOhm suppressed and fit on the 4mm thread of the plug directly (not on the SAE 6.3mm screw on nut).
It is difficult to find something that fits. I also could machine down from 18 to 16mm (which I tested on an otherwise wrong cap)
Which 2.6 or 3ltr driver can help?
Yours
Peter
 

Jun 08, 2011 7:52 am
Julian Offline
Member
Registered since: Dec 04, 2007
Location: Belgium


Subject: Re: DB Lagonda spark plug caps
Morning Peter,

Try the bottom of this page!

http://www.holden.co.uk/...Name=Spark+Plug+Caps

Hope it helps,
Regards,
Julian
Julian Messent
 

Jun 08, 2011 5:57 pm
Peter S30 Offline
Global Moderator
Registered since: Nov 27, 2007
Location: Germany


Subject: Re: DB Lagonda spark plug caps
Thank you, Julian. I saw them too but thought the diameter looks to big. I phoned Holden today and diameter is fine but length 69mm, the inside length of my cap covers is 63mm. With my next order there I will get some of them and see if I can machine away a bit from the length.
 

Jun 30, 2011 7:04 am
Peter S30 Offline
Global Moderator
Registered since: Nov 27, 2007
Location: Germany


Subject: Re: DB Lagonda spark plug caps
I ordered the two versions available from Holden, one is black modern plastik and has no resistor, the other is brown classical hard resin and has 5kOhm. Both have the SAE 6.3mm connector to the spark plug. The brown classical one is produced by Bremi in Germany, part no 10249N5, Bremi also have other versions

The black one is 21mm diameter and 70mm long and does not fit into the rubber cap
The brown one is 19mm diameter and 62mm long. I ground it down on lathe to 17mm diameter to fit into my rubber caps

I think new rubber caps, also available from Holden, might have solved the problem more easily, the inner diameter looks larger on the Holden homepage.

Some more usefull parts suppliers for the DB Lagonda:

gsparkplug.com have (cheaper than others):
  • contact breaker Lucas - DSB122C 407050 costs 6 GBP
    condensor DCB121C 407044 484261 489244, costs 7.50 GBP
    Voltage regulator RB106 12V Screw - Replaces NCB100 costs 22 GBP
    spark plug NGK C6HSA or C7HSA 1.6 GBP
all prices +VAT

distributordoctor.com:
have rotor arm and distributor cap, a bit more expensive than Holden but claim to have better quality, might be also a good address for other distributors (even V12) and repair

Thumbnails of attached images:

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This post has been edited 1 times. Last edit on Jun 30, 2011 7:07 am by Peter Schirg.  

Jun 30, 2011 9:54 am
h14 Offline
Member
Registered since: Nov 30, 2008
Location: Chalandray, France


Subject: Re: DB Lagonda spark plug caps
Hi Peter,

Already asked Distributor Doctor re V12 distributors; unfortunately he only works on Lucas types.
Regarding the Voltage Regulators, my understanding is that pattern replacements have a pretty poor reliability record. The RB106 regulator comes up frequently as new old stock on ebay.
Likewise I'd avoid pattern rotor arms. My LG6 currently has 1 distributor & 1 coil. When I bought the car, the coil ignition wasn't working. Soon found the new "Park" rotor arm had burnt through. No worries, another new one made by Park amongst the spares. That lasted 500 miles. Fortunately the original, but very second-hand Lucas rotor arm was also with the spares. Still working fine.
Laurence

Laurence
 

Oct 02, 2012 6:56 pm
ray sherratt Offline
Member
Registered since: Jul 05, 2012
Location: wirral cheshire


Subject: Re: DB Lagonda spark plug caps
Peter.
Lock at http://www.Magnecor.com.uk they make 7 mm resistor lead sets. Phone and order
set for Aston DB2 side entry cap which I presume is fitted to your Lagonda.
All the Astons I build I fit these.
Ray Sherratt
 

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