Beru connectors

bones · Jul 27, 2005

Does anyone know the reason for the resistors in the Beru plug caps? They provide about 3-4k ohms resistance. Today I learnt I could source 150 ohm resistance connectors to go with the Taylor wire I will be using on the harness I'm making. They are not there to provide RF protection , I'm sure of that but I'm starting to think they produce more bang from the coil , does anyone know if this is true, if it is I'll stick with the Beru connectors, that resistance is there for a reason because theoretically low resistance is the way to go.

Sundeep · Jul 29, 2005

I've always considered Beru as the less quality version of Bosch.. prob' why they have resistors in their plug caps, as their OEM 993 plugs are awful ! [

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bones · Jul 29, 2005

I'm informed the resistors are there in the caps of Beru connectors to pull more bang from the coil, I 'll have to do some more research on this as I'm making an new set of plug leads up soon.

Guest · Jul 30, 2005

Bones,

Try here for some extra info http://www.magnecor.com/magnecor1/frequent.htm questions 4 and 17 are relevant I think. Site has much about leads just takes for ever to find what you want.
Rats

Guest · Jul 30, 2005

I wouldn't use Bosch plugs on a lawnmower - they suck the almighty big one. NGK plugs Sundeep, only way to go [8D]

On the subject of resistors, it's worth remembering that the biggest resistance in your plug circuit comes from the plug gap itself. The resistors are there to back up the coil energy before it gets to the gap, but they are squeezing the energy, not dissipating it. Once there is enough energy to jump the plug gap, it all has to flow through the circuit. After passing through the plug cap resistors, the spark at the gap, though weaker, is also longer, and that is what those resistors will be doing IMO, giving you a longer spark duration.

There is a nice simple little piece about some enthusiast research into this here.

bones · Jul 30, 2005

Interesting reading John, the total resistance in a stock 911 ignition lead is 4-5k ohms. 1k at the dizzy and 3-4 at the Beru connector. I've spoken to a few people who run 911s in the National Race Championships this week and they all use stock leads, at least the connectors. I was advised to stick with the Beru connectors with the resistors (bad design idea IMHO) as they create the correct bang from the coil and it has little if anything to do with supressing RF. Taylors can supply the quality cable I need and new design connectors to give a low resistance of 150 ohms total, end to end! I'm reluctant to try this for fear of damaging the CDI box or coil, tempted as I am , I don't fear engine damage because worse case scenario would be a weak spark and wet plugs, easily remedied by ripping the new wires out and putting stock back in there. My engine is running great but those wires can't be healthy after 26 years, I think I'll do the misting test with water at night and see if I get a light show.