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FHP plugs

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Griff

Posts: 18

Joined: Sat Apr 02, 2005 1:01 am

Location: Cambridgeshire, UK

Post Sun Jan 17, 2010 5:47 am

FHP plugs

I've been messing around with different plugs for years now and wondered if anyone had any recommendations?

It's a 96" flatheadpower knuckle from 2003

Image

Would appreciate your comments

Thanks

Griff
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john HD

User avatar

Posts: 302

Joined: Sun Mar 19, 2006 5:26 pm

Location: madison wisconsin usa

Post Sun Jan 17, 2010 10:38 am

Re: FHP plugs

nice looking bike!

what have you tried so far? i have pretty good luck with NGK in my pan and in a buddies knuck. champions work well too.

i do know resistor plugs do not work well for me.

john
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Griff

Posts: 18

Joined: Sat Apr 02, 2005 1:01 am

Location: Cambridgeshire, UK

Post Sun Jan 17, 2010 1:07 pm

Re: FHP plugs

Thanks John, is that an FHP knuck if so which model of plug?

Thanks

Griff
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john HD

User avatar

Posts: 302

Joined: Sun Mar 19, 2006 5:26 pm

Location: madison wisconsin usa

Post Sun Jan 17, 2010 9:54 pm

Re: FHP plugs

nope regular knuck, what size does a new one take? 18 mm?

john
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Chris Haynes

Posts: 2616

Joined: Wed Jul 05, 2000 12:01 am

Location: Los Angeles, CA

Post Mon Jan 18, 2010 12:44 am

Re: FHP plugs

H-D # 3's. :D
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Cotten

User avatar

Posts: 2667

Joined: Thu Sep 30, 1999 12:01 am

Location: Central Illinois, USA

Post Mon Jan 18, 2010 11:25 am

Re: FHP plugs

Beware of modern NGK A6 plugs that are now resistors, but not labeled as such.
Dixie recently still had old stock.

Once upon a time a fellow posted to this forum, I believe, that he cut his plugs open and found algae.

Is he still with us?


....Cotten
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Griff

Posts: 18

Joined: Sat Apr 02, 2005 1:01 am

Location: Cambridgeshire, UK

Post Mon Jan 18, 2010 1:38 pm

Re: FHP plugs

I'm currently using an Accel 116

I found this great cross reference chart so it seems the same as a BP5ES

http://www.angelfire.com/extreme4/skido ... ERENCE.htm

Griff
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Jerry Wieland

Posts: 606

Joined: Mon Nov 01, 1999 1:01 am

Location: Menomonie, Wisconsin, USA

Post Mon Jan 18, 2010 10:32 pm

Re: FHP plugs

I use C 86 in AC or 386 in Autolite.

Jerry
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T.Shoe

Posts: 77

Joined: Tue Jun 15, 2004 12:01 am

Location: Custer Wa.

Post Thu Jan 21, 2010 10:51 pm

Re: FHP plugs

I ask this same question after finishing my fhp top end have been running ngk B7ES after the help of our friends on this site

live to ride tshoe
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Griff

Posts: 18

Joined: Sat Apr 02, 2005 1:01 am

Location: Cambridgeshire, UK

Post Fri Jan 22, 2010 3:31 am

Re: FHP plugs

Thanks Tshoe

The B7ES is much shorter than the ones I've been, using Accel 116 (ZGR5C or BP5ES equavalent depending on which site you believe)

http://www.sparkplugs.co.uk/pages/datab ... artno=B7ES

http://www.sparkplugs.co.uk/pages/datab ... rtno=ZGR5C

I'll give these a go and let you know.

Thanks

Griff
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panic

Post Fri Jan 22, 2010 9:04 am

Re: FHP plugs

Be careful when buying plugs based on the H-D number - that's a heat range and service recco, and does not specify which engine. There's also a #3 in 14mm for panhead etc.
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Sidewinder

Posts: 89

Joined: Tue Dec 25, 2007 4:04 pm

Location: Norway

Post Sat Jan 23, 2010 2:14 am

Re: FHP plugs

Griff wrote:The B7ES is much shorter than the ones I've been, using Accel 116 (ZGR5C or BP5ES equavalent depending on which site you believe)


The B7ES and BP5ES is basicly the same. The main difference is tha the center electrode is produding longer in to the chamber on BP-plugs. ZGRR5C is different.

http://www.sparkplugs.co.uk/pages/datab ... rtno=BP5ES
Torstein
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panic

Post Sat Jan 23, 2010 7:40 am

Re: FHP plugs

IMHO the extended tip (NGK "P") is preferable, and will run slightly cooler as the tip is in the intake wash. However, it must clear the piston dome not only with safety, but with enough room for the flame kernel to expand away from the gap without obstruction.
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hdrl1935

Posts: 172

Joined: Mon Aug 18, 2003 12:01 am

Location: San Diego, CA

Post Mon Jan 25, 2010 1:01 pm

Re: FHP plugs

Jerry Wieland wrote:I use C 86 in AC or 386 in Autolite.

Jerry


Autolite 386 is a resistor plug. Autolite 3116 is the non-resistor version. And that's the one I've been seeming to have luck with. :wink:
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Boots99

Posts: 33

Joined: Tue May 05, 2009 3:28 pm

Post Thu Mar 25, 2010 9:53 pm

Re: FHP plugs

Try the Bosch quad platinum 4479. They are 14mm, long reach with a very broad heat range. I've been running them in my '40 knuck on the street for about 5 years and never fouled one. Thats saying something for a stroked knuck.

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