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Posted by: Elliot Cannon Oct 2 2013, 06:01 PM

Just got new plugs for my 2.2 liter type 4. New plugs on the left. WR7cc+. The old plugs WR7dc+, have a longer electrode that sticks into the combustion chamber further. Can anyone tell me if the shorter electrode will have any effect on the engine? The old plugs were made in Brazil and the new ones in Russia.


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Posted by: SLITS Oct 2 2013, 10:24 PM

Can't tell you until I see if the heat range of the plug is different. It's to late tonight to go looking for a heat range chart.

Initially, the only effect is to lessen the chances of the piston hitting the plug, but you didn't have that problem anyway. Perhaps the longer electrode provided for better ignition of the fuel/air mix in the combustion chamber.

Maybe the Russians are just shorter by nature so they make things shorter.

Posted by: kg6dxn Oct 2 2013, 10:36 PM

Really you should pull a head and see how the plug indexes into the combustion chamber.

Posted by: Eric_Shea Oct 3 2013, 07:19 AM

Both 7's as far as heat range goes.

CC is 1mm and DC is 2mm electrode.

CC is correct for a T4

Posted by: 72hardtop Nov 11 2013, 02:17 PM

Bosch are crap these days...India, Russia, China, Thailand. Crap pure crap. NGK or nothing.

Posted by: The Cabinetmaker Nov 11 2013, 03:07 PM

plus 1 on the ngk.

Looks like your running very rich and that plug was not tight.

Posted by: Elliot Cannon Nov 11 2013, 03:39 PM

QUOTE(The Cabinetmaker @ Nov 11 2013, 01:07 PM)

Posted by: Cap'n Krusty Nov 11 2013, 05:12 PM

CC is correct for 914s (as well as 911s), extended tips (DC) aren't.

The Cap'n