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ngkr spark plug differencies advice needed photo inc

mcw

mcw

Contributing Member
"while checking my plugs today

"while checking my plugs today i suddenly notice that there are slight differencies in the electrod point, even thou all the plugs are identical codes NGK BR6FS and the box shows 4323.

i have recently order a couple for stock and that ones also has the smaller cap.


can any advise me if i should change the plugs to match electrod point or dont bother, or is there a better plug that i could install.
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any advice would be appreciated, to me the the plugs even when new look cheap, but ive been told there are no other plugs that fits my volvo penta aq430B v6.

thanks again all

mcw"
 
"I think what you are seeing i

"I think what you are seeing is how each manufacturer uses a different technique to achieve the same heat range for a given application. This may explain why they appear to look different.

As long as there is no piston/chamber interference, the important issue would be matching the correct heat range.

."
 
Heat range of a spark plug is

Heat range of a spark plug is generally controlled by the reach of the plug's electrode into the combustion chamber. Even though both plugs have the same P/N and are made by the same manufacture it would appear to me that they are different heat ranges.
 
"ok thanks guys so i should tr

"ok thanks guys so i should try and match all the plugs the same.

ive just looked on the plugs again and stamped on the silver hex side were the socket fits, one says BR6FS/K655 AND THE OTHER SAYS BPR6FS/H8ZF.so i have 3 of the right plugs may be and 3 of the wrong plugs.

How would i go about finding what is the plug for my engine."
 
"On some engines its marked on

"On some engines its marked on the top of the flame arrestor (at least it is on mine)

Volvo is really annoying, i.e., not really consumer friendly with their "Volvo P/N" spark plugs...

Go to:
http://www.sparkplugs.com/

Use their cross reference guide."
 
"thanks robert A, followed lin

"thanks robert A, followed link realy helpfull good site i think i am going to try and get the K & N E3 plugs, im a great beliver in haveing a high quality ignition system inc spark plugs and the K/N E3 look perfect, and haveing a gas drinker of a engine which i also like old and tradional carb i think it might do justice to the engine.

thanks again for replys"
 
"thanks Robert A, followed lin

"thanks Robert A, followed link realy helpfull good site i think i am going to try and get the K & N E3 plugs or the Champion marine 5942 plugs, im a great beliver in haveing a high quality ignition system inc spark plugs and the either one look perfect, and haveing a gas drinker of a engine which i like and tradional carb.

Good plugs might do justice to the v6 engine.

thanks again for replys"
 
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