AFR measurement was Re: O2 voltages

[steve ravet]

Dave Williams wrote:
> 
> -> Sort of on topic - What do you folks (if any) use to cut the threaded
> -> section OFF the spark plugs so you can see the carbon ring? Are any
> -> specific manufacturers plugs easier to cut (or pop off) than others?
> 
>  I use the lathe and a cutoff tool.  You can use a Dremel and the little
> abrasive cutoff wheels too; use a vise to hold the plug and hold the
> Dremel with one hand bracing the other.  Sometimes the cutoff wheels
> will dig in funny and get spit out in odd directions.

There are 2 kinds of dremel cutoff wheels -- really thin ("wafer thin"?)
red ones and thicker ones that look like they're made of fiberglass or
something.  Don't use the thin ones without eye protection, if they get
hung up at all they'll break apart and that's bad news at 25k rpm.  The
thicker ones use a different mandrel, don't wear as fast, and I've never
had one break.  I don't use the thin ones anymore.

--steve


-- 
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com
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