Depending on the motor.
Example: the 89-94 1.3ltr Swift GT (DOHC) has notch on two ends that
closely resembled the Dodge hemi design. The spark plug was set in the
middle and the owner required a ten-inch socket extention to reach the plug.
Using the the same configuration for the 4.7 semi-hemi design, I tried the
Bosch 4 Plus. (MY COMPUTER IS ON THE BLINK-ALL CAPS). AFTER THE FIRST 100
HUNDRED MILES THE BUTT DYNO REVEALED THAT IT DID LOSE SOME POWER. LOOKING
AT THE DESIGN OF THE PLUG AND THE TOP DOWN INITIAL SPARK COMBUSTION, IT
SHOULD BE THE PLUG OF CHOICE. THEN I TRIED THE BOSCH 2 PLUS AND SAME RESULT.
I HAD TO REVERT BACK TO THE OEM NGK COPPER-CORE VERSION AND FELT THE RESULTS
RETURN.
ON THE 4.7 DODGE, I NOTICED A CHANGE IN THE FIRST TWO HUNDRED MILES SINCE I
RESET THE COMPUTER. NEVER NO MISFIRE, ROUGH IDLE, OR THE PREVIOUS MENTIONED
LISTED PROBLEMS FOUND WITH THE PLUGS FOR 15K MILES.
LIKE JAY W, I WOULD EXPERIMENT TO FOUND THE PLUG OF CHOICE. SINCE IT
CLOSELY RESEMBLES A HEMI DESIGN THE MOST LIKELY PLUG SHOULD BE THE BOSCH
VERSION. THE EXCEPTION TO THIS RULE IS THE ADDED MSD OR CRANE DIS
MULTI-SPARK UNITS.
I am even experimenting with different coils, intake (carbon fiber), intake
filters, engine oils, and so forth.
I know it cost money but having that knowledge is beneficial for the next
project.
--------------------------------------
Steven St.Laurent
C2 IOW/IOS Engineer
C4i Engineering Branch, PSD, MCTSSA
MARCORSYSCOM, U.S. Marine Corps
Office (760) 725-2506 (DSN Prefix: 365)
"Never be content with somebody else definition
of you. Instead, define yourself by your own beliefs,
your own truths, your own understanding of who
you are. Never be content until you are happy with
the unique person GOD has created you to be."
-----Original Message-----
From: jay & dana [mailto:jay&dana@telus.net]
Sent: Thursday, March 21, 2002 2:49 PM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: Bosch +4's on the 4.7
Steven
Just curious, which sparkplugs (brand) do you prefer?
Thanks
Jay
-----Original Message-----
From: Stlaurent Mr Steven <STLAURENTS@MCTSSA.USMC.MIL>
To: 'dakota-truck@dakota-truck.net' <dakota-truck@dakota-truck.net>
Date: March 21, 2002 6:26 AM
Subject: RE: DML: Bosch +4's on the 4.7
>
>This is where I would disagree. Plugs just don't increase HP but is the
>spark that is created within the combustion chamber.
>
>Using one brand over another is usually based on the design of the plug and
>the combustion chamber.
>
>--------------------------------------
>Steven St.Laurent
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