How do you determine the best spark plug?

Skulptorchaz

OK, I was initially told Bosch Platinums are the only plugs to run. I'm now questioning that info. I read some old posts here and it seems NGK's are preferred.
So now the questions:
-Which plug do you prefer?
-And most importantly, how do you determine the best plug for your engine??

In case someone would like to offer a suggestion for my engine, mine is a 1915, large SCAT cam, stock heads cut to fit, duel 40 EMPI carbs., electronic ignition in 009 distributor and I run premium gas. Not sure what else to tell ya. But if you need more info to make a guess, by all means, let me know what ya need.
Thanks a bunch!!

weasel_ugs · Posted: Fri Oct 09, 2015 6:35 pm Post subject:

I will never ever use Bosch plugs, I had waaay too many problems with them. I use NGK for a regular 1600 in my 1915 and have had very good luck with them.

didget69 · Posted: Fri Oct 09, 2015 6:39 pm Post subject:

VW Ignition system doesn't have the juice to run Platinum/Iridium plugs. I run Bosch or NGK, no issues.

http://www.thesamba.com/vw/forum/viewtopic.php?t=605730&highlight=plugs

bnc
_________________
I never found the need to impress people with any mechanic certifications, trophies or track wins... unless it was for Mom to post on the refrigerator door.

Dr OnHolliday · Posted: Sat Oct 10, 2015 11:42 am Post subject:

First of all, non-resistor...
_________________
1965 Type 1 sunroof Baja / about 70k miles on self-rebuilt '74 1600 and counting / SP heads and aftermarket valve keepers / non-doghouse shroud with external cooler and filter / 1.5 qt extended sump / Weber 32/36 DFAV progressive carb / 009 dist with Pertronix / 1.25 ratio rockers and ball adjusters / 1.5" stainless steel J-pipes and carbon steel baja exhaust

Skulptorchaz · Posted: Mon Oct 12, 2015 11:22 am Post subject:

Thanx BNC!! That is exactly what I was looking for. Great info. It looks like with my stock heads, I can run the BP6HT's if I can find them. I almost bought the ET's. (Pfew, dodged that bullet.)
I appreciate the "steering" to the thread!

didget69 · Posted: Mon Oct 12, 2015 2:48 pm Post subject:

Skulptorchaz · Posted: Thu Oct 15, 2015 5:57 pm Post subject:

OK, I can't seem to get the BP6HT plugs so would BP5HS be OK?? They are a step hotter but not 3 electrode.
Any other suggestions?

didget69 · Posted: Thu Oct 15, 2015 6:45 pm Post subject:

'chaz...

Look at some of this info - I don't see that a triple electrode is really necessary.

http://www.thesamba.com/vw/forum/viewtopic.php?t=526065&view=next

bnc
_________________
I never found the need to impress people with any mechanic certifications, trophies or track wins... unless it was for Mom to post on the refrigerator door.

Skulptorchaz · Posted: Fri Oct 16, 2015 7:40 am Post subject:

Thanx nic. It "seems" that they will be fine. I'm wondering what the "P" stands for tho. (??)
Also, since running and electronic ignition, it seems opening up the gap is better. Any truth in that?

didget69 · Posted: Fri Oct 16, 2015 8:34 am Post subject:

Th 'P' designates a projected tip...

http://www.ngksparkplugs.com/docs/tech/design_symbols_plugs.pdf

http://www.sparkplug-crossreference.com/convert/NGK_PN/BP5HS

http://www.ngk.com/product.aspx?zpid=9402

I would maintain the gap recommended by the manufacturer.
http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqgap.asp?mode=nml

bnc
_________________
I never found the need to impress people with any mechanic certifications, trophies or track wins... unless it was for Mom to post on the refrigerator door.


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