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cecil
Samba Member
Joined: February 23, 2005
Posts: 461
Location: Stockton, CA
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 Posted: Wed Mar 16, 2016 11:35 am Post subject: Correct spark plugs |
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Running NGK BPR5EIX Iridium. 14mm X 3/4. Pulled plugs to read, and found what appeared to be a few bee specks and silver smudges on the insulator. The color is lite gray, ground strap has a ring right at the turn. The end of the threads are med/dark gray, And does not rub off. Concerned about the specks, should I be?
914 2054cc case with Type 4 heads, 41 X 35, 7.5 cr
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21513
Location: Oklahoma City
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| Posted: Wed Mar 16, 2016 11:47 am Post subject: Re: Correct spark plugs |
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| cecil wrote: |
Running NGK BPR5EIX Iridium. 14mm X 3/4. Pulled plugs to read, and found what appeared to be a few bee specks and silver smudges on the insulator. The color is lite gray, ground strap has a ring right at the turn. The end of the threads are med/dark gray, And does not rub off. Concerned about the specks, should I be?
914 2054cc case with Type 4 heads, 41 X 35, 7.5 cr |
How many miles? Post a picture.
In general....specks on ceramic are from fuel additives or actual fuel splatter from poorly atomized fuel at warm up.
Is this in a bus ? Fuel injected?....I am assuming a bus with that low compression. Ray |
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cecil
Samba Member
Joined: February 23, 2005
Posts: 461
Location: Stockton, CA
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| Posted: Wed Mar 16, 2016 12:04 pm Post subject: Re: Correct spark plugs |
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Engine in my Thing w/HPMX 40's. 32 venturi, 135,55,200, 5000mi
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I may not be that funny or athletic or good looking or smart or talented....I forgot where I was going with this
I have this wierd desease called "must tear everything up and put it back together when there's nothing wrong with it...Itus." |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21513
Location: Oklahoma City
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| Posted: Wed Mar 16, 2016 12:56 pm Post subject: Re: Correct spark plugs |
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| Hard to tell much from the picture. ...but you are running rich. Ray |
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[email protected]
Samba Member
Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
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| Posted: Wed Mar 16, 2016 1:13 pm Post subject: Re: Correct spark plugs |
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what plug gap? Looks huge. I run .028" in everything.
I'd also consider a "6" heat range. Specs are also often evidence of detonation.
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raygreenwood
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Joined: November 24, 2008
Posts: 21513
Location: Oklahoma City
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| Posted: Wed Mar 16, 2016 3:47 pm Post subject: Re: Correct spark plugs |
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| [email protected] wrote: |
what plug gap? Looks huge. I run .028" in everything.
I'd also consider a "6" heat range. Specs are also often evidence of detonation. |
Its just the bad picture. Iridium electrodea are roughly 0.5mm diameter and would be invisible in that picture.
Also....is there some reason you chose a "booster gap" style spark plug? The "X" in the part number denotes a booster gap design...which is an anti-fouling feature......but sometimes doesn't play well with low voltage systems.
So....what ignition system are you running.
And yes....I agree with john.....I would use a 6 heat range in NGK which = a 7 in Bosch. The 5 jn NGK is an 8 in Bosch. Ray |
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cecil
Samba Member
Joined: February 23, 2005
Posts: 461
Location: Stockton, CA
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| Posted: Wed Mar 16, 2016 6:42 pm Post subject: Re: Correct spark plugs |
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Pertronix in a good Bosch SVDA. Just got plugs suggested by the local import parts store for a 914. Suggest something that you feel would be better. Sounds like you have a handle on plugs.
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I may not be that funny or athletic or good looking or smart or talented....I forgot where I was going with this
I have this wierd desease called "must tear everything up and put it back together when there's nothing wrong with it...Itus." |
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DeathBySnuSnu
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Joined: August 25, 2012
Posts: 1183
Location: MS
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| Posted: Wed Mar 16, 2016 8:48 pm Post subject: Re: Correct spark plugs |
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With a standard type coil and such, I probably would go with some copper core with a projected tip. Of whatever brand and heat suits you.
I have the bpr6eix-11 plugs. Same, but differnt heat and a larger gap.
But.... i am running crank trigger and ford coils, big cam.
Like stated earlier, not to sure of the booster gap for your app. But other than that good plugs. |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21513
Location: Oklahoma City
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| Posted: Wed Mar 16, 2016 9:55 pm Post subject: Re: Correct spark plugs |
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| DeathBySnuSnu wrote: |
With a standard type coil and such, I probably would go with some copper core with a projected tip. Of whatever brand and heat suits you.
I have the bpr6eix-11 plugs. Same, but differnt heat and a larger gap.
But.... i am running crank trigger and ford coils, big cam.
Like stated earlier, not to sure of the booster gap for your app. But other than that good plugs. |
Yes....crank fire and COP or a capacitive ignition....with booster gap would be fantastic. Really....booster gaps work great with any modern ignition.....late 70s snd on with a bit more voltage than the 18kv of a stock vw coil.
If the OP has a stockish coil.....the plugs he has are a great "type" of plug....meaning the iridium is superb.....but I would avoid the booster gap unless you have at minimum a Pertronix 40kv coil. The heat range......you fould probably live with but a 7 in Bosch or a 6 in NGK would be better.
See if they have something along the lines of BP6EI.....in that type without the "X".....or if you have a better than stock coil...just move to a 6 heat range and you should be fine. Ray |
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cecil
Samba Member
Joined: February 23, 2005
Posts: 461
Location: Stockton, CA
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| Posted: Thu Mar 17, 2016 5:28 pm Post subject: Re: Correct spark plugs |
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Ray,
I have a Pertronix coil. Can't find any one that has BP6EI's, so what is plan B?
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I may not be that funny or athletic or good looking or smart or talented....I forgot where I was going with this
I have this wierd desease called "must tear everything up and put it back together when there's nothing wrong with it...Itus." |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21513
Location: Oklahoma City
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| Posted: Thu Mar 17, 2016 7:10 pm Post subject: Re: Correct spark plugs |
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| cecil wrote: |
Ray,
I have a Pertronix coil. Can't find any one that has BP6EI's, so what is plan B? |
You will be fine with that coil and those type of plugs and the "X" listing....but go to the next beat range which is a 6. Look for BP6EIX. Ray |
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Spezialist
Banned
Joined: July 01, 2005
Posts: 1941
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| Posted: Wed Apr 27, 2016 8:13 am Post subject: Re: Correct spark plugs |
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Be careful, there are many combinations out there. I still run copper wires, w8ac plugs, Bosch coil. Gapped big, to accommodate the poor fuel of today.
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jfats808
Samba Member
Joined: December 10, 2007
Posts: 5022
Location: oahu hawaii
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| Posted: Wed Apr 27, 2016 8:26 am Post subject: Re: Correct spark plugs |
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I followed the info from this write up
http://www.braigasen.com/howtoread.htm
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