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MG Midget and Sprite Technical - 1500 Plugs

Hi All,

Thanks for all your's help so far its much appreciated. Progress made; a regular spark is happening on all leads and I get a 'kick' and a repeat kick when trying to start with old petrol and 10 year old plugs. (Oh for a pre engaged starter and an electric pump - maybe later).

Off to get some V power in a while (nearest fuel 7 miles away, my regular drive is a diesel so no luck there) but after ringing around this morning no one has N9Y plugs nearby. I have been offered a whole range of stuff so just want a bit of a guide to other makes equivalents.

Also after reading up a bit in the archive as the car has not been running for 12 years has anyone any advice re 'a better plug' to get it going. It does sound willing and I think it may just go with the normal plug but travelling = money where I live so if it doesn't cost loads its best to get what I need in one trip.

Nearest good factor is Parkers Car Parts in Grantham, (7 miles) - offered Denso - next nearest is Euro Car Parts in Nottingham (20 miles) offered Denso, Bosch and NGK - so advice is always good to have before the fetching and carrying begins.

Dave Squire - Notts

Simply buy the best plugs in the world NGK you will need NGK BP6ES or BPR6ES if you would like resistor plugs.
Robert (Bob) Midget Turbo

Thanks Bob, I have sourced some BPR6ES's from eurocarparts (helpful people) and when or if it stops rainin, I'm going out to have a go.
Dave Squire - Notts

The plugs coming out are NGK BP5ES's just interested in the difference between those and the 6's. Have gone with the 6ES ones anyways. Do you know the difference Bob? I quite like to know for future ref in my head.

Cheers, Dave
Dave Squire - Notts

Hi Dave

For some reason the direct comparison NGK to the original Champions for a lot of BMC cars comes out as a 5 rather than a 6 in the NGK range

The numbers refer to the heat range of the plug and if you get a higher number you will likely start to foul the plug because the plug will run cool to cold. A lower number may cause the plugs to run too hot and may cause deonation/pre ignition.

A lower number can help enormously with an older engine that burns oil, this can foul cooler plugs so a warmer plug will keep plugs free of oil.

However if you have a high compression engine then a cooler plug can help to prevent pre ignition

Whatever the amateur mechanic should not change plugs for anything lower than 5 or anything above a 7 and all should fit the average plug which is a 6 unless they have a very good reason not to!
Robert (Bob) Midget Turbo

Thats been really helpful Bob.

I may get around to having a go starting in a bit. Son, grandson (18 months) and weary Mondeo decended this morning and changed my nice lonesome organised day into a fix trak rod so he could get to evening shift.

Thanks very much. Dave
Dave Squire - Notts

this is a link to the NGK part number key (pdf) - http://www.ngksparkplugs.com/techinfo/spark_plugs/partnumberkey.pdf

as you've seen with these being listed as 5 instead of 6 whatever information you get from whatever source it's usually best to cross-reference the information with two other sources, lots of cataloges have typos and errors

if anyone wants any Champion RN9YC I have 12 NOS
Nigel Atkins

This thread was discussed between 07/07/2012 and 09/07/2012

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