HT Leads and Distributor Caps

Hello,

at the risk of boring everyone, I have here some information that might be of interest to those with engines requiring these things.

I was looking at the Magnecor HT leads and read all the info on their website, which seems to indicate they offer a good product. However, I wanted to see if there were any alternatives and well, there are:

BERU
http://www.beru.com/english/produkte/kabel.php

The first item in this web-link seems very similar to the Magnecor items, with the wound stainless-steel conductor. The winding of the conductor effectively introduces an internal resistance (for EMI supression) whose value is dependant on the length of the lead.

• Ferromagnetic silicon
• Stainless steal resistace wire with 5,6 kOhm resistance per metre,
  high voltage transmission up to 40,000
• Silicon inner isulation
• Glass febre mesk
• Silicon cover, durable and resistant to high temperatures
  (-60° C bis +250° C)

The third item is the original fitment, with copper cable and a suppression damping resistor fitted inside the plug connectors. In fact, it too seems of a comparatively high specification, with silicone outer sleeve and high temperature rating.

• High quality silicon ignition lead with copper core
• Silicon coating
• Damping resistor
• Original spark plug contacts
• Exposy resin carrier
• Distributor contact
• Damping resistor
• Silicon protective cover
• Original ignition cable terminating components
• Exposy resin carrier
• Metal shielding

I would argue that the original fitment is perhaps a better engineered solution than the Magnecor-type cable, since each lead will have exactly the same impedance (resistance). Added to which the plugs and connectors seem to be of a better quality. (At least from what I can make out of the pictures on the Magnacor site.)

As for the Distributor Caps, the original design for these ones appears to belong to Bosch, but both BERU and BREMI offer copies and generally BREMI is considered the best (stainless-steel fasteners etc) and was the brand fitted by BMW.

Complete BERU list:
http://www.beru.com/english/produkte/produktfinder.php?hersteller=BMW&modell=8+(E31)&typ=850+CSi&ktypnr=3843&action=step04

The BREMI items can be found here:

Rotor | 7004

System: bo
Material: Polyester
Resistor: 1.000
Connection:

Applicable for:
ALFA_ROMEO, BMW, CITROEN, LANCIA, PEUGEOT, RENAULT, ROLLS-ROYCE, VOLVO

http://www.en.bremi.de/produktdetail?artnbr=7004

Distributor Cap | 8069R

System: bo
Material: Polyester
Shield: Shield of conductive material

Connection: 4 mm snap on pin

Applicable for:
BMW, ROLLS-ROYCE

http://www.en.bremi.de/produktdetail?artnbr=8069R

Ignition Cable Set | 552L100

Cable: Copper_/_Silicone_7_mm

Material:
Connection: SAE connection sleeve , 4 mm snap on connection sleeve, 4 mm snap on connection sleeve

Applicable for:
BMW

http://www.en.bremi.de/produktdetail?artnbr=552L100
http://www.en.bremi.de/produktdetail?artnbr=552R100

Real OEM shows the Ignition Lead part number as follows, without mention of M73 version. Therefore there is some difference in the M73 part:-

• Part 12121733007 (Ignition harness with marten repeller) was found on the following E31 vehicles: E31 850Ci Coupe, M70, AUTO (EG23) : ignition wiring/sparkplug
  
  
  • E31 850Ci Coupe, M70, MANUAL (EG13) : ignition wiring/sparkplug
  • E31 850CSi Coupe, S70, MANUAL (EG93) : ignition wiring/sparkplug

  
  

I don't know what the differences are, but

• it could be to do with the plastic trunking enclosure that is included with the leads (you could re-use your existing part?)
• length of leads?
• Connector on Inductive spark sensor lead?

You can check here: http://www.en.bremi.de/

http://www.en.bremi.de/fl/resu…search=Modify+your+search

However, I could not find any part number listed for the M73, 5.4:

http://www.en.bremi.de/fl/resu….4:240:M73%20B54:26418:12

But for the M70 and S70, there is a part-number listed:

http://www.en.bremi.de/fl/resu…0-280:M73%20B50.56:538:12

You might try sending an email enquiry.