Hi David Langton!!
On Tue, 8 Apr 1997, David Langton wrote:
> I currently run V Grove's (NGK) but was wondering if there is an advantage
> to run Split Fires.?
According to the engine dyno tests run by "Mopar Madness" magazine, your
only advantage to the splitfire plugs is that they will be a fresh set
of plugs... They found that the Bosch Platinum plugs produced a
horsepower increase IF THE GAP WAS OPENED UP. A normal gap produced no
significant hp increase!! They ended up doubling the gap size,
whereupon they had a hp loss, so they closed up the gap app. 10-15%.
On our '73 "B", with STOCK Lucas ignition, we run Bosch Platinums with a
gap of 0.055". The engine will pull strongly up a hill under WOT up to
the 6,000 rpm red line. A gap of 0.060" causes misfiring under these
same conditions, but will run ok at cruise.
We've had the same plugs in for at least 12-15,000 miles. Our first set
only lasted about 1-2,000 miles because my son filled up with a
non-brand, el cheapo super high octane gas and poisened the plugs. The
car couldn't do over 40 mph untill we changed back to a set of
regular plugs, ran the tank dry twice, and refilled with Exxon
non-leaded regular each time. Then we switched back to the Bosch plugs
and haven't had any trouble since... but NO EL-CHEAPO GAS.
BTW, they handle Mohawk ethanol enritched (5%) regular just fine.
TTUL8r, Kirk Cowen
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