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Spark Plugs Question

General Tech Talk

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Pep
Posts: 189
Joined: Fri Jun 16, 2006 7:39 am
Location: Caboolture, Qld

Spark Plugs Question

Post by Pep »

Hey All

Just wondering what is the difference between
NGK BPR6ES and
NGK BP5ES
as both of these will fit my 1.3 Sierra engine
Also what are if any the advantages in closing or opening the gap

Thanks Pep
Last edited by Pep on Wed Nov 07, 2007 8:34 am, edited 1 time in total.
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Post by Sic Lux »

i'd say one is a resitor plug and other is not i'll find out today.
plenty of parts on the bench
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Pep
Posts: 189
Joined: Fri Jun 16, 2006 7:39 am
Location: Caboolture, Qld

Post by Pep »

Sic Lux wrote:i'd say one is a resitor plug and other is not i'll find out today.
Thanks Sic Lux

I believe the number has something to do with heat, but i'm not sure
how that works.
What is better for an old engine

Pep
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Post by Harb »

As far as I am aware the number ie 5 or 6 is the heat range and the R is for resistor type plug.......

cheers
Harb

http://www.4wdmonthly.com.au/shed/index.php?id=2244&im=1
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Post by trains »

The 5 is a little hotter, the ceramic insulator is shorter in the inside of the plug body, and yes the R designates that its a resistor plug.

Opening the gap will increase the amount of voltage required to jump the gap, thus giving you a larger spark initially, however the duration of the spark will be reduced accordingly.

I think we all remember old worn out plugs with large gaps, and cars would just fail to run, or start because of it. Close them up and away you go.

Remember that as a plug wears, its gap opens, when points wear, the gap closes.

I cant remember the gap setting for that engine, but I assume its 0.8mm.
I would set them on .8 and leave it.
ngk are good plugs.

Trains
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