Have Bosch made a mistake? Spark Plug Specs

[rokkz]

I recently purchased a set a Bosch Platinum Spark Plugs for VYII V6, and noticed since the change the car felt tighter, less power.

The Standard OEM plugs for the vehicle which are identical throughout the Ecotech range from the VT to the VY Series 2 V6~
NGK BPR6EFS-15 (1.5MM GAP)

However after looking into the Bosch Plug a little further I discovered the plug Bosch Specify for the VX-VY only has a 1.3MM Gap, this also applies to their entre plug range. Yet on the VT they specify a 1.5MM Gap as per OEM.

Have they made a mistake?, have they confused the Gap with the VX-VY Super Charged Gap, which OEM Gap is 1.3mm?

They have only been in 2 weeks, and thinking of exchanging them over to the Platinum’s Bosch recommend for the VT (1.5mm Gap) as per OEM spec.

Bosch Links Page26
http://www.bosch.com.au/content/language1/downloads/sparkplugs_passenger_(2).pdf

Your opinions appreciated

Cheers

[Speedy Gonzales]

Going off memory, the supercharged is 1.3mm, ecotec is 1.5mm.

I still use that same plug on my opened LS1 after all these years, old faithful BPR6EFS-15.

Its funny reading posts of people who have gone to huge extents to change over something so inherently simple, fair enough if you are chasing fractions of a second.

[iamhappy46]

Buy NGK plugs... better quality and usually a bit cheaper as well :)

[Devil CV8]

Am I missing something. Isn't it standard practice to get the damn feeler guages out, set the gap of the spark plugs before installing them? If the ones you have are 1.3mm, then you open them up to 1.5. where exactly is the problem......

[rokkz]

Am I missing something. Isn't it standard practice to get the damn feeler guages out, set the gap of the spark plugs before installing them? If the ones you have are 1.3mm, then you open them up to 1.5. where exactly is the problem......


The problem is, there factory set, and have a V-groove like end, non adjustable, similar to the super 4's.

Further more I am not after any performance gains, just after a reliable plug that doesn't shit its self before changing. Bosch Plantium's are only $30 per set. $10 more than the NGK's Standards.

[QUOTE=Speedy Gonzales;1197516]Going off memory, the supercharged is 1.3mm, ecotec is 1.5mm.

QUOTE]

I know, as stated in my original post, however Bosch plugs state the standard is 1.3 not 1.5mm

Cheers

[Devil CV8]

The problem is, there factory set, and have a V-groove like end, non adjustable, similar to the super 4's.


sorry, I don't believe any sparkplug is non adjustable. drop one on the concrete tip first and bend the electrode in, are you going to bend it back out and use it, or bin it?

[iamhappy46]

check any NGK catalogue. Iridium and Platinum tips are very prone to breakage if trying to adjust plug gap. The feeler gauge can cause the tip to bend/twist/etc which causes problems with misfires due to tip continuity.

NGK even sell their Iriway and Iritop range of iridium plugs to ricers in pre-gapped specs as they do not sell 0.8mm Iridiums in the required plug types(BKR7EIX-0.8)

[Devil CV8]

check any NGK catalogue. Iridium and Platinum tips are very prone to breakage if trying to adjust plug gap. The feeler gauge can cause the tip to bend/twist/etc which causes problems with misfires due to tip continuity.


fair enough. just showing my age I suppose. dangnabbit, these new fangled sparkplugs not being able to have the gap adjusted....

:):)

[rokkz]

sorry, I don't believe any sparkplug is non adjustable. drop one on the concrete tip first and bend the electrode in, are you going to bend it back out and use it, or bin it?

First of all if I dropped a plug on concrete, there wouldn't be a hope in hell I would screw into the block, Spark tips arn't made for flex back and forth after a drop, further more would pass on weakining the ceramic insulator , heard they don't perform to well in cylinders when removed.

[saaz]

I use the iridiums in a bike. When adjusting the gap larger never press against the centre electrode. In fact for normal plugs you are not supposed to either due to damage to the ceramic parts.. If the gap needs enlarging leverage off the side of the plug. Most plug measuring and adjusting tools have the right bits for doing this. If making the gap smaller no issue of course. I doubt whether there would be any noticeable difference between a 1.5 and 1.3mm gap. In fact over time the gap should increase, however slghtly with iridiums/platinums, so starting off with a slightly smaller gap would be better in the long run.

[iamhappy46]

fair enough. just showing my age I suppose. dangnabbit, these new fangled sparkplugs not being able to have the gap adjusted....

:):)

:):)
Yeah, it is annoying having preset plug gaps especially if you have an ignition system up to the task of running big gaps then it is back to copper plugs.