So can I use the regular gap plug and just change the gap from
.080 to .060 ?????
> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto
wner-gmcmotorhome]On Behalf Of Gcbr
> Sent: Sunday, April 04, 1999 5:32 PM
> To: gmcmotorhome
> Subject: Re: GMC: 455 Spark Plugs
>
>
> Rob
>
> I would not recommend the .080 gap. Most recomend .060 or less. I
> am running .045. I too have seen the "Plus 4" plugs. The problem I
> have with them is they only come in one heat range or so the Auto
> Zone folks told me. Here is an article you might find interesting.
>
> BOSCH PLATINUM+4 SPARK PLUGS
> by
> Larry Carley
>
> Robert Bosch Corporation is introducing a new breed of
> premium spark plug called the "Platinum+4." The new long life
> plugs, which retail for around $6 each, have a unique four pole
> electrode design that eliminates wear, resists fouling and
> improves ignition performance over a wide range of operating
> conditions.
> Surrounding the center electrode, which contains 75% more
> platinum than previous Bosch platinum plugs, are four "surface
> air gap" ground electrodes made of a special wear-resistant
> nickel yttrium alloy. The angle and position of the four
> electrodes creates multiple spark paths that cause the spark to
> jump sideways. This has a self-cleaning effect on the center
> electrode and results in a longer, more powerful spark that
> reduces misfires for improved engine performance, better fuel
> economy, lower emissions and faster acceleration.
> Bosch tests have shown the new Platinum+4 plugs can improve
> fuel economy up to 4.8% over other competitive spark plugs.
> Fouling resistance is also said to be 33% better.
> Though Bosch makes no specific mileage claims for their new
> Platinum+4 spark plugs, they do say the plugs will meet or exceed
> OEM requirements for 100,000 mile replacement intervals. Bosch
> says the plugs show almost no increase in firing voltage
> requirements after 100,000 miles of operation. Bosch has also
> run tests where the plugs have gone over 150,000 miles with
> no appreciable wear -- so these would seem to be lifetime plugs
> for many vehicle applications (unless, of course, the engine is
> burning oil, in which case fouling might occur).
> Another unique feature of the Platinum+4 is that the surface
> air gap between the center and four ground electrodes is factory
> present to 1.6 mm and is nonadjustable. No attempt should be
> made to adjust or change the air gap when the plugs are installed
> -- even if the air gap specification is different from that
> specified for a standard spark plug. The wider gap of the
> Platinum+4 is necessary to achieve the advantages above.
> The new Bosch Platinum+4 plugs are available initially in 11
> part numbers, which provide 89% market coverage on cars and light
> trucks back to 1983. Two additional numbers will be added in
> early 1999 to expand the coverage to 97%
> Bosch says that even though the demand for replacement spark
> plugs worldwide is decreasing due to longer plug life, the demand
> for premium replacement plugs is on the rise. Bosch estimates
> that premium plugs will account for 25% of all aftermarket sales
> by the year 2000.
>
>
>
> In a message dated 4/4/99 2:43:43 PM Central Daylight Time,
>
> > got : BOSCH platinum pregaped at .080" part #4223.
> > Anyone know if this plug is correct. Also I noticed
> > in my last trip there same brand of plugs but called
> > " Plus 4". This plug has four gap points on it. Quite
> > ingenius I think!
> > Rob Teed 74 Painted Desert
>
>
>
