Spark plug choice Options

[Trekkor]

I was wondering if using a plug that is too hot or cold can damage the engine as opposed to just robbing me of potential power?

thanks


KT

[pfierb]

I was wondering if using a plug that is too hot or cold can damage the engine as opposed to just robbing me of potential power?

thanks


KT

For sure running a plug that is too hot can do big damage to your engine like putting a hole in a piston......too cold will just foul out.

[Allan]

I'm running an MSD box, MSD Blaster II coil and Pertronix.

NGK B6ES plugs and it runs gud...

[Trekkor]

Here's my NGK B8ES's.

The three darker ones are from the passenger side.


KT

[Trekkor]

also, now that I run those dual glass packs, i can see that the passenger side puffs more visible light blue/grey smoke when idleing. ( side with darker plugs )

two plugs have a strange pitting. Almost arcing scoring or checking on the insulator and hex head.

second from the left and the one in this pic.


KT

[Trekkor]

After almost two years of *very hard* miles on an old motor of unknown origin, is it just time to replace the plugs?


KT

[campbellcj]

I'm running the BP7ES with good results. The 8's are very cold, probably marginal even for both of our cars with small sixes and mostly high-revving track usage. I have a set in my spares box but have not seen any reason to install 'em so far.

[Trekkor]

How would you describe the improvements by going to a 7 or even a 6 as compared to the current 8 NGK?

Thanks for your reply.


KT

[pfierb]

Here's my NGK B8ES's.

The three darker ones are from the passenger side.


KT

Aside from the second plug from the right,in your picture,they seem to be running too cold.....B8ES is two heat ranges too cold for your car B6ES is the recommended plug for a 914.

[Trekkor]

I ordered a set of 6's. They should be in around noon.

I'll try them today.

Thanks


KT

[campbellcj]

FWIW here is a tech article on NGK's site -

http://www.ngksparkplugs.com/techinfo/spar...&country=US

it explains the construction and heat range topics

[iamchappy]

Henry at Supertec recommended these plugs for my engine. I've not tried them out but Henry seems to know what he's talking about.
BKR6EKUB

[Trekkor]

OK-

They are in and the Vineyard Lap™ was good. (IMG:style_emoticons/default/rocking nana.gif)

I noticed better throttle response right away and less bog when mashing the pedal.
I pulled a plug from the darker side, light and no soot.

While idleing I bent down and took a big whiff off the tail pipe (IMG:style_emoticons/default/unsure.gif)
It doesn't smell like gas anymore.

May have solved the carb "problem" too.

Thanks for the help.


KT

[McMark]

From the above link:

If the tip temperature is lower than 500°C, the insulator area surrounding the center electrode will not be hot enough to burn off carbon and combustion chamber deposits. These accumulated deposits can result in spark plug fouling leading to misfire. If the tip temperature is higher than 850°C the spark plug will overheat which may cause the ceramic around the center electrode to blister and the electrodes to melt. This may lead to pre-ignition/detonation and expensive engine damage.

The 8 is a cold plug and doesn't accept much heat from the combustion process, therefore it might not be hot enough to burn off the carbon, leading to plug fouling over time. The more carbon on the plug electrode, the weaker and more erratic the spark.

The 6 plugs should be good. Keep an eye on the ceramic insulator for cracking or signs of running too hot.

[Trekkor]

Yes, my first mistake was going into FLAPS two years ago and asking for, "six of them 911 spark plugs ya got over there..." (IMG:style_emoticons/default/teef.gif)

(IMG:style_emoticons/default/headbang.gif)



KT

[Cap'n Krusty]

Yes, my first mistake was going into FLAPS two years ago and asking for, "six of them 911 spark plugs ya got there..."

(IMG:style_emoticons/default/headbang.gif)



KT

That's TWO mistakes. Going into a FLAPS for parts to fit a European car, and actually ASKING for those parts. Well, THREE mistakes. You bought what they told you to buy. BTW, the NGK book only goes back to the 80s, and lists nothing colder than a 6.

BTW, the 6 should be fine in your engine. The Cap'n

[pfierb]

Yes, my first mistake was going into FLAPS two years ago and asking for, "six of them 911 spark plugs ya got there..."

(IMG:style_emoticons/default/headbang.gif)



KT

That's TWO mistakes. Going into a FLAPS for parts to fit a European car, and actually ASKING for those parts. Well, THREE mistakes. You bought what they told you to buy. BTW, the NGK book only goes back to the 80s, and lists nothing colder than a 6.

BTW, the 6 should be fine in your engine. The Cap'n

Go to NGK on line and you will find that they go back to 1956 for Porsche plug applications.
Paul F.

[Trekkor]

Great results on the track.

No more bogging.

Maybe I'll pull a plug out and take a picture.


KT

[Jerry]

I have been using NGK B8ES plugs in my SIX.
Is there a better plug?


Has anyone ever tried the Denso iridium plugs or the NGK iridium plugs?? Do they offer any performance or is it all hype???? Anybody ever dyoed these plugs???

[jk76.914]

Henry at Supertec recommended these plugs for my engine. I've not tried them out but Henry seems to know what he's talking about.
BKR6EKUB

I put a set of those in my Audi V8 last month. Exact part number. Factory plugs were Bosch FGR7KQEO, which have 4 electrodes. Apparently the Boschs are only available at the Audi dealer, and they have an Audi/VW logo not Bosch. They're also like $12 each! For anyone hankering to try a 4 electrode plug, there's a part number and source.

Anyway, I'll be putting a set of the NGKs in my 914 when I upgrade my ignition over the winter. Should be interesting.

Jim