I have no experience with this method, but will say that the location of the
beginning of the flame front in the combustion chamber should have an effect.
I would think that shortening the time to the section prone to detonation
(the hot side, exhaust) would give a favorible result and allow a smidge more
ignition timing. I don't think that the small amount of direction change would
have much effect on the flow down over the plug from the inlet valve although
that is very important in heat range or extended nose type plugs. MY opinion.
Never be beaten by equipment
> Date: Sun, 17 Jul 2011 10:22:46 -0500
> From: cartravel@pobox.com
> To: toodamnfunky@comcast.net
> CC: fot@autox.team.net
> Subject: Re: [Fot] TR4 spark plug and indexing poll for full race spec
motor
>
> Oops, I fogot to send my original reply to the list. Several 1%
> improvements could add up. In my limited experience with dynos (mostly
> low horespower motors), it seems like multiple pulls will frequently
> show a 1% difference. Other opinions?
>
> On 7/16/2011 10:30 PM, Jim Gray wrote:
> > Larry,
> > We have some local Ford GT350 racers/tuners that see 1.2% gain on the
dyno
> > on a 470 HP motor when the plugs are indexed. The whole issue came up
when
> > discussing several small improvements that add up to time gained
on-track.
> > I'm still improving my driving skills but won't pass up an opportunity to
> > improve the car wherever I can.
> >
> >
> > jim g
> >
> > -----Original Message-----
> > From: Larry Young [mailto:cartravel@pobox.com]
> > Sent: Saturday, July 16, 2011 5:38 PM
> > To: Jim Gray
> > Subject: Re: [Fot] TR4 spark plug and indexing poll for full race spec
motor
> >
> > I like NGK BP7HS for a hotted up TR3/4. One notch colder than stock.
> >
> > Is the effect of indexing measurable on a dyno? I wonder. If it's not
> > measurable, that would explain the variety of opinions. It's so great
> > to talk about differences that can't be measured.
> >
> >
> > On 7/16/2011 12:21 PM, Jim Gray wrote:
> >> Fot
> >>
> >> I was curious as to what spark plugs everybody runs and favorite gaps.
> >>
> >> I'm playing around with index washers now and opinions seem to vary on
> > that
> >> subject.
> >>
> >> It's been said that it's best to index the plugs facing the exhaust
valve,
> >> between the valves and toward the
> >>
> >> intake valve. Lots of opinions on that subject.
> >>
> >> Any comments ?
> >>
> >>
> >>
> >> Thanks,
> >>
> >> jim g
> >> _______________________________________________
> >> fot@autox.team.net
> >>
> >> http://www.fot-racing.com
> >>
> >> Donate: http://www.team.net/donate.html
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> >> Unsubscribe:
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> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
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