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 Post subject: BPR5ES or BPR6ES
PostPosted: Sun Sep 16, 2018 3:44 pm 
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848cc
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Joined: Sun May 02, 2010 7:49 pm
Posts: 131
Location: Canberra, ACT
I'm changing the spark plugs, engine is 1275 with twin 1.25 SUs and very mild cam, what is the consensus on the best spark plugs?


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Sun Sep 16, 2018 4:23 pm 
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848cc
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Joined: Sun Mar 16, 2014 11:01 am
Posts: 456
Location: TOWNSVILLE NQ
jme wrote:
I'm changing the spark plugs, engine is 1275 with twin 1.25 SUs and very mild cam, what is the consensus on the best spark plugs?


Champion N9Y or N9YC cooper core and you can still buy them.


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Sun Sep 16, 2018 5:07 pm 
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998cc
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Joined: Mon Jan 12, 2015 10:59 pm
Posts: 963
Location: Holt ACT
Stibbsy wrote:
jme wrote:
I'm changing the spark plugs, engine is 1275 with twin 1.25 SUs and very mild cam, what is the consensus on the best spark plugs?


Champion N9Y or N9YC cooper core and you can still buy them.


One two many "o"s and one too few "p"s?


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Sun Sep 16, 2018 8:03 pm 
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1275cc
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Joined: Fri Oct 20, 2006 5:03 pm
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Location: Out in the shed cleaning up my own mess.
Are these any good?

https://www.ebay.com/itm/CHAMPION-SPARK ... 2749.l2649

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1967 Cooper S - ready for reg.
1965 Cooper S shell - all painted up, ready for fit out.
1969 Cooper S Mk2. Engine reco WIP
1966 Deluxe- next rustoration!
Mk 2 & XJ6 Jags. Less said the better.


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Sun Sep 16, 2018 9:29 pm 
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religious status
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39621
Location: near Baulkham Hills, NSW
NGK BPR5ES these days.
Rumour has it resistor plugs give a hotter spark,
BP recommend 1 heat range hotter for unleaded fuel,
NGK plugs are made in Japan, not Mexico or elsewhere.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Sun Sep 16, 2018 10:01 pm 
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848cc
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Joined: Wed Jun 10, 2009 2:42 pm
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Location: In the shed until Rylstone!
NGK all the way, have used them in race cars for years. no probs.

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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Sun Sep 16, 2018 11:35 pm 
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848cc
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Joined: Thu Sep 26, 2013 10:48 pm
Posts: 177
Location: Adelaide
NGK BP5ES over here, 10:1cr 1275 with a cam.

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Sapphire Blue Deluxe spread across three parts cars, two sheds and a driveway...


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Mon Sep 17, 2018 9:23 am 
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Joined: Wed Sep 08, 2004 9:27 pm
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Location: Wodonga - Vic/NSW border
yeah, 5's are what you want

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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Mon Sep 17, 2018 12:43 pm 
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848cc
848cc

Joined: Sun May 02, 2010 7:49 pm
Posts: 131
Location: Canberra, ACT
I previously had problems with plug fouling in the queue for the motorkhana where it idles for ages (maybe 15-30 minutes) and only has a 30 second or less run before waiting another 15-30 minutes in the queue. Is it worth going one heat range hotter (i.e. BP6ES)?


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Mon Sep 17, 2018 12:51 pm 
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1275cc
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Joined: Fri May 02, 2008 3:07 pm
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5 is hotter than 6

Attachment:
ngk chart.jpg


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Mon Sep 17, 2018 1:06 pm 
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1275cc
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Joined: Fri Oct 20, 2006 5:03 pm
Posts: 2727
Location: Out in the shed cleaning up my own mess.
jme wrote:
it idles for ages (maybe 15-30 minutes) and only has a 30 second or less run before waiting another 15-30 minutes in the queue.


Not sure letting an A series idle for prolonged periods is such a good idea.
Less/insufficient splash lubrication for the bores/pistons at low engine speeds.
But waiting in a 'khan queue maybe no options, unless you push it along!

_________________
1967 Cooper S - ready for reg.
1965 Cooper S shell - all painted up, ready for fit out.
1969 Cooper S Mk2. Engine reco WIP
1966 Deluxe- next rustoration!
Mk 2 & XJ6 Jags. Less said the better.


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Thu Feb 28, 2019 3:27 pm 
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848cc
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Joined: Mon Sep 26, 2016 11:27 am
Posts: 349
Location: Mangilao, Guam
I was using a BP6ES and it fouls after idling for a while so now I am going to try a BPR4ES. My question is on my 1973 Clubman GT do I use 91 or 87 unleaded fuel or do I use a lead additive and which octane fuel rating? thanks

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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Thu Feb 28, 2019 3:35 pm 
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1275cc
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Joined: Fri May 02, 2008 3:07 pm
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GuamMini wrote:
I was using a BP6ES and it fouls after idling for a while so now I am going to try a BPR4ES. My question is on my 1973 Clubman GT do I use 91 or 87 unleaded fuel or do I use a lead additive and which octane fuel rating? thanks

Use 95 or 98 fuel. Why are you jumping BP5 and going straight to BP4?


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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Thu Feb 28, 2019 4:23 pm 
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1275cc
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Joined: Sun Apr 29, 2012 1:19 pm
Posts: 4336
Location: Wollongong, NSW
I think Guam would use the same octane rating as the US:
98 RON (AUS) is about the same as 93 AKI (US)
95 RON (AUS) is about the same as 91 AKI (US)

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 Post subject: Re: BPR5ES or BPR6ES
PostPosted: Thu Feb 28, 2019 4:51 pm 
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848cc
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Joined: Mon Sep 26, 2016 11:27 am
Posts: 349
Location: Mangilao, Guam
gtogreen1969 wrote:
GuamMini wrote:
I was using a BP6ES and it fouls after idling for a while so now I am going to try a BPR4ES. My question is on my 1973 Clubman GT do I use 91 or 87 unleaded fuel or do I use a lead additive and which octane fuel rating? thanks

Use 95 or 98 fuel. Why are you jumping BP5 and going straight to BP4?


I am tired of buying plugs so I thought 4 should be better. The 6 lasted for a few months. Yes we have 87 and 91 AKI. No 93. Do I need to add a lead substitute? I have not been using one.

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1973 Clubman GT
YG2S8 1637


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