Misfire under load, then complete loss of spark from coil - V8

G`day Edward ,

hope it behaved on your trip last.

My days with 2 stroke motorcycles found NGK to be the ones to use above all else and the ones i use to this day in all when replacing .

People will quote heat ranges as the correct way to select a sparkplug but the correct way for a given engine is the colour of the sparkplug that has run in the engine . This was also learnt with 2 stroke motorcycle but carries forward to any .

https://dalhems.com/f/d/43799054945d...listalumme.pdf

I don`t know if the above link is of use but within it has a link to Luminition.com which will go to Autocar the makers of Lumenition .

Cheers

G'day Peter,

Thank you for your suggestions and the link. The more i read on the net the more i see people recommending NGK plugs. In the past i had been lucky to get 35,000 km from a set of NGK plugs before they started to misfire badly on LPG. I didn't think this was much so i thought i'd try the Bosch plugs. Since then i have met an engineer who used to work for an ignition parts company who said 30,000 km is about the life of a standard plug in a Rover V8 on LPG that runs at high revs on the highway (4 speed). He recommended replacing them every 25,000 km or so.

The truck didn't miss a beat on the trip thanks! (Well, apart from a snapped throttle cable in Coober Pedy. Nothing a bit of tie wire couldn't fix). Thanks again for all your help.

I hope all is well with you mate.

Edward :)

Just as an aside - if a RV8 still has its standard distributor never put an aftermarket rotor button in - always use the Lucas version. A few years back I had my D1 V8 serviced and as part of that the rotor button was replaced - about 3 months later I started to have running issues on a trip and pulled into a Landie parts supplier who indicated the possible issue - the aftermarket rotor button was replaced with a Lucas one and all was good.

Being sceptical despite the improvement (at the time Lucas $70, aftermarket $30) I researched on the web and found the parts supplier was spot on with lot s of reported problems where the aftermarket version starts to play up after 3 months.

Not your problem this time around but keep in mind for the future.

Garry

1. You can use a Bosch GB864 rotor button to suit a XF Falcon if you can't get a genuine Lucas one. Most Lucas boxed stuff is now Chinese junk, so watch out.

2. Bosch plugs are now made in Russia, not very reliable any more. I now use Brisk Silver plugs part number LR15YS and they seem to be much better on LPG than Bosch now is. Contact via the website:

Brisk Spark Plugs Australia

Quote:

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Originally Posted by bee utey

1. You can use a Bosch GB864 rotor button to suit a XF Falcon if you can't get a genuine Lucas one. Most Lucas boxed stuff is now Chinese junk, so watch out.

2. Bosch plugs are now made in Russia, not very reliable any more. I now use Brisk Silver plugs part number LR15YS and they seem to be much better on LPG than Bosch now is. Contact via the website:

Brisk Spark Plugs Australia

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We just bought 10 genuine Lucas rotors and all were junk, arcing through the shaft. Lucas has apparently recently outsourced these.

We’ve also found the genuine LR ones not much better. We’ve ordered some “Powermax Red Rotors” from Powerspark. Will test and report when they finally arrive.

Quote:

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Originally Posted by rayhyland

We just bought 10 genuine Lucas rotors and all were junk, arcing through the shaft. Lucas has apparently recently outsourced these.

We’ve also found the genuine LR ones not much better. We’ve ordered some “Powermax Red Rotors” from Powerspark. Will test and report when they finally arrive.

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I have recently bought the following. Not fitted yet, but they appear to be good quality:

Part No. TVR RD66B TVR Rotor Arm Rover V8 OE Spec

Part No. TVR 035E782A Distributor Cap TVR Rover V8 - Black

All this talk of using genuine Lucas rotors got me thinking. The truck had a minor misfire which i assumed were the old plugs which i put back in. Looking back at my logbook, it appeared that the plugs were only 18,000 km old. Shouldn't miss that early surely. I took out the 40,000 km old Facet rotor and put in an old (many years old and well over 100,000 km) Lucas rotor. The truck hasn't missed in days! The gauge of the brass section of the Facet rotor is much thinner than the Lucas (and the TVR rotor shown in the link above).

Edward :)