?I would take a peek at my wideband gauge when going full bore down the
front straight with the pedal to the metal.?
On Thu, Jun 29, 2017 at 12:09 AM, Stephen Myers via Fot <fot at autox.team.net>
wrote:
> You cannot use any reading that you saw on your plugs after a race as any
> basis for changes. Your plugs can change in such a quick time that without
> a dyno your readings will mean almost nothing. The correct way to read
> plugs at a track if you have to is to make a few laps and then accelerate
> hard out on a lap and on the last corner and shut the engine down when you
> let off to coast into the pit lane to do your readings. Running your
> engine any amount of time between full load on your engine and your reading
> will give you false readings. Your racing engine requires such small
> adjustments and tolerances than what ?reading plugs? is intended for with
> street cars that using this method is not very useful compared to other
> methods such as a proper gas analyzer.
>
> I will add that using a dyno logging air fuel ratio you can also view how
> the profile of your needle is working and adjust needles only where needed
> based on piston heights instead of basing your needle choices on overall
> lean/richness.
>
> -Steve
>
>
> On Jun 28, 2017, at 10:32 PM, Henry Morrison via Fot <fot at autox.team.net>
> wrote:
>
> Thanks for your replies. I usually check my plugs in the reflection in my
> knockoffs from the light from a Coleman lantern. My current needle supplier
> has not suggested anything other than the RH, usually he has a plethora of
> suggestions.
>
> I didn't build the engine but it has an advertised compression ratio north
> of 10:1. It has an Isky cam with the number at home in the file. Previous
> owner ran an couple of races at altitude (+- 5000 ft.) and one Kastner Cup
> down at about 800 ft............................
> ............................................................
> ............................................................
> ..............................with the SM needles.
>
> I plopped the RH needles in at Blackhawk and it still looked lean.
> Hopefully I haven't done any damage.
>
> Bruce pulled well up above 5000 revs, I didn't dare venture up to 6000,
> but he felt like he would go there no problem.
>
> I'll be at Road America with at least as many needles as spare
> spokes......................
>
> Cheers, Henry Morrison, Albuquerque, NM
>
>
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