[DML] Re: Hot Plugs

["content22207" <brobertson@xxxx>]

But not too hot -- HR9's I started towards Fall Foliage with never
made it past Fayetteville. Think they came out cleaner than they went
in! Even though insulator is LONGER than Delco R42, and electrode is
nothing more than a tiny dot, burn much hotter. Too hot for my
particular PRV.

I am 9.5:1 however. Hot plugs in a high compression engine can cause
mixture to ignite before spark (actually you get two explosions: one
preignition/predetonation -- whichever term is correct -- and one from
ignition), especially on lower octane fuel.

You want gold/caramel color. Dry black soot is too cold. Absence of
color is too hot. 

BTW: if anyone on list has a high mileage engine, or one that burns
oil, I will give away set of HR9's with less than 100 miles. Contact
me direct: brobertson(at)carolina.net.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <webmaster@xxxx> wrote:
> Yep, I made a boo-boo there - HOT plugs on low compression engine, and 
> COLD plugs on high compression/turbo engine. I knew it was the opposite 
> to what you might first think, but confused myself into a 
> double-negative! The DeLorean should run HOT plugs
> 
> Martin
> 
> content22207 wrote:
> 
> >Cold plugs can carbon foul, especially on a car that doesn't get much
> >road use.
> >
> >Oil burners are also vulnerable.
> >
> >Re: continuing ignition controversy -- again I wonder why the
> >controversy over a $30 part? Is practically the cheapest thing on
the car.
> >
> >And I personally find it does make a difference...
> >
> >Bill Robertson
> >#5939
> >