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PostPosted: Wed Apr 19, 2017 10:04 pm 
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3 Deuce Webber

Joined: Tue Nov 06, 2012 4:30 am
Posts: 69
Location: LEBANON, MAINE
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After all the posts I have read one of the most recommended sparkplugs is the
NGK 3459 ZFR5N

Then all my research on boosted or nitrous says

mild boost 1 range cooler plug

Lot of boost 2 ranges cooler plug

I am not seeing a cooler plug listed for NGK ZFR5N so I contacted NGK Tech support and asked them what would be 1 cooler and 2 cooler plug starting at ZRF5N specs

1 cooler = NGK 4291 ZFR6F-11

2 cooler = NGK 5913 ZFR7F

And -11 is .043 gap and would need to be adjusted per ignition and boost

Any advise here as to ZFR5N with 7-8 lbs boost thanks

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PostPosted: Thu Apr 20, 2017 3:26 am 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 11576
Location: Blacksburg, VA
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I believe that is the extended reach plug. I would recommend NOT using that type of plug for a boosted application. Based on some experience with turbo cars (increased detonation and at least one blown head gasket and melted piston), these are not good with boost. I cannot say for sure as these (2) were not my cars, but I trust the folks who made the observations (Drakes and Sam Powell) and so that is enough for me to avoid them.

I would get one of the following (or compatible equivalent):

NGK GR6, GR7, BPR6ES
Autolite 63
Champion RN9YC

NGKs might be hard to find, but maybe their tech support could recommend a crossover? I like NGK plugs, but am running Autolite 63s in my turbo Dart now and they have been fine. That is what I could buy at a local parts store last time I wanted to try new plugs and was on the road. I have been running a 0.038-0.040" gap, but as I go up in boost I plan to close this up to 0.030-0.032".

Hope this helps,

Lou

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PostPosted: Thu Apr 20, 2017 6:24 pm 
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3 Deuce Webber

Joined: Tue Nov 06, 2012 4:30 am
Posts: 69
Location: LEBANON, MAINE
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Thanks I had no luck looked all over
Not seeing gr6 or gr7 any chance you know the full ngk# ?

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 Post subject: Yep...
PostPosted: Thu Apr 20, 2017 7:21 pm 
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Joined: Tue Oct 29, 2002 8:27 pm
Posts: 9225
Location: Salem, OR
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Quote:
Not seeing gr6 or gr7 any chance you know the full ngk# ?


Looks like NGK only has these in the platinum plugs now...

Quote:
BPR6ES


I know that these are sometimes used by guys running NA High Compression...


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PostPosted: Fri Apr 21, 2017 3:24 am 
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3 Deuce Webber

Joined: Tue Nov 06, 2012 4:30 am
Posts: 69
Location: LEBANON, MAINE
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Thank you guys

BPR6ES are on the way 😎😎

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1963 Plymouth Valiant Wagon


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 Post subject:
PostPosted: Wed Jun 21, 2017 12:46 pm 
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EFI Slant 6

Joined: Thu Jun 24, 2010 12:30 pm
Posts: 265
Location: GYMPIE,QLD,AUSTRALIA
Car Model*:
Would these plug recommendations apply to a supercharged slant running low PSI ?
I am currently running the NGK ZFR5N plugs with a gap of 0.04" and HEI .

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 Post subject:
PostPosted: Sat Aug 05, 2017 11:04 am 
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Turbo EFI

Joined: Tue May 17, 2005 4:26 pm
Posts: 1080
Location: CBS Newfoundland Canada
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I have ran bpr7es lot # 5534 now I am using bpr9es lot #7788, I think they cross reference to champion rn63y and rn65y race plugs. with 10 to 14 psi I gap them at .025". seems too work.


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