Resistor and non-resistor plugs

marinatlas said:
What is the difference between IW22 and VW22 ?
Click to expand...
My understanding is the VW22 has platinum plated electrode - looks like it includes all of the "ground" metal is plated.
The IW22 does not.
If you're running two coils it will make no difference.
Cheers
 
I was happy to see the Fluke meter shown in the video. I worked in product development on that meter when I worked at Fluke. Rest assured it's a good one.
 
"Four Denso VW22s just arrived - equivalent, but better spec, to NGK BPR7EIX."


The rare earth electrodes will maintain their gap longer - which is a good thing as far as maintenance/emissions is concerned but in a ton of dyno tests we never found any difference in engine power between spark plugs of different electrode material.
 
I’ll play :)

Timely post. I recently purchased 4 BPR73ES 2023 cheaply from eBay:


Bike has been running just fine with them but I thought I’d test them and the ones installed on my cNw build by Matt before the bike left the US earlier this year.

My 4 have both the batch number stamped and the ngk website printed on the box. Matt’s has a different batch number as I would have expected.

All of them measure between 4.43 - 4.79 k ohm so presumably I’m good and at £12.90 for 4 I’m happy too.
 
Well, in just over 300 miles, this is the result. Can't really believe it!
Denso VW22's
VW22's 310 miles.webp
 
Café au Lait said:
So how do you interpret that then Rob? They appear unused, is that a good thing?
Click to expand...
What's not really evident in the photo is:
1. The centre, ground electrode has slight mid-light grey deposit - I see that as good.
2. The metal body of the plug is clean, almost no deposit - not sure what to think, certainly not bad.
3. The ceramic is almost spotless - again, unsure, but I don't think bad.

It will be interesting to see how things look after a couple of thousand miles.
Cheers
 
I believe the Denso 22 is slightly hotter than a NGK 7, I know my W22 EPU Run cleaner, So the clean burn is likely on a briskly driven bike that is well tuned. I like the construction of the NOS ND plugs I just brought.
 

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