RE: Re: Re: Observations on spark plugs for the 4.7

From: Stlaurent Mr Steven (STLAURENTS@mctssa.usmc.mil)
Date: Tue Nov 28 2000 - 10:42:48 EST


Again going with the head design and angle of the valves I would not opt for
the Bosch 4 for any Chevy products or the 318 design.

-------------------------------------------
Steven St.Laurent
Test Engineer
Test Branch, GSD, MCTSSA
MARCORSYSCOM, USMC
760-725-2506 (DSN 365-2506)
Work:mailto:stlaurents@mctssa.usmc.mil
Home:mailto:saint1958@home.com

-----Original Message-----
From: Tim Berry [mailto:coolva1@home.com]
Sent: Monday, November 27, 2000 9:08 PM
To: dakota-truck@buffnet.net
Subject: DML: Re: Re: Observations on spark plugs for the 4.7

I am running the regular Bosch Platnums, and I know everyone has preached
not to do it with the MSD, but I think my throttle responce is up, as well
as gas milage (180 miles, over 1/4 tank left) normally 200ish is when its at
1/8th...
I also had the regualr platnums when my truck was near stock, felt damn
good...
+4's in my bro's LS1 (12 sec T/A) ran like pure crap... as I think they
would in a 318... just get the regualr ones...
*-=-=-=-=-=-=-=-=-=-=-=-=-*
Tim Berry (97 Dakota Club Cab)
Chesapeake, VA
Best 1/4: 13.50@101.91
*-=-=-=-=-=-=-=-=-=-=-=-=-*
> Does anyone have any opinions yet on how these plugs would work on a 97,
> 318?
>
> Thanks
> Jay
> >Well,
> >
> >I went plumb loco and bought a set of Bosch +4's (P/N 4418) for the 4.7
> based
> >in part on the comments of a fellow DML'er (forget exactly who) and the
> >claims of Bosch. The fellow DML'er mentioned that the semi-hemi design
of
> >the 4.7 seems to lend itself to the +4 design and that his best track
times
> >were had with this plug. The "open" nature of the plug presents the
spark
> to
> >the air/fuel mixture with less obstruction than a conventional plug
without
> >indexing. Hummm? Seems to work.
> >They don't ping, the idle and pull of the motor is smoother, and the
> >subjective butt-dyno perhaps feels some additional pull.
> >
> >As the search for a good plug for the 4.7 continues I wanted to give my
> >impression of the Bosch +4 plugs. This one might be good.
> >
> >Andrew



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