What is the torque spec on spark plugs?
SPARK PLUG Installation
|Thread Size||Recommended Torque||Recommended Tightening Angle|
|M14||20-30N・m||About 2/3 turn|
|M18||30-40N・m||About 1/4 turn|
|M14 Taper seat||10-20N・m||About 1/16 turn|
Do Denso spark plugs come pre gapped?
DENSO spark plugs are manufactured with a pre-set gap. With nickel plugs, especially with motorcycles, the gap may need adjustment. Always use a special spark plug gapping tool to change the gap. Do not change the gap on platinum, iridium or twin tip spark plugs, as the fine electrodes may get damaged.
How do you gap a Denso spark plug?
To increase the gap size:
- Step 1: Use needle nose pliers or spark plug gapping tool to bend the ground strap up to the desired height. DO NOT LET THE PLIERS OR GAPPING TOOL TOUCH THE IRIDIUM CENTER ELECTRODE OR PORCELAIN.
- Step 2: Re-check the gap with a calibrated gapping tool.
What happens if spark plugs are over torqued?
An over-torqued spark plug can cause stress to the metal shell, leading to thread damage or breakage. Over tightening can also compromise a plug’s internal gas seal or even cause a hairline fracture in the insulator. Remember anything interfering with the torque process can cause a plug to fail or worse, engine damage.
Are Denso spark plugs good?
Denso plugs are installed on almost every automobile model manufactured in Japan. The iridium used in them has a superior hardness. The electrode’s diameter in Denso plugs shrinks more than an NGK. For this reason, Denso plugs do not last longer than NGK units, but they are better at producing powerful sparks.
How long do Denso spark plugs last?
All Denso long life iridium spark plugs are an OEM design, made for a specific engine. Some feature a special resistor or electrode design, depending on the OE requirements. In their OE application, Denso’s long life plugs can last up to 120,000 miles.
Which is better Denso or NGK?
It is difficult to rule out a winner in the Denso debate against NGK, as both are iridium spark plugs and offer almost similar performance. The electrode’s diameter in Denso plugs shrinks more than an NGK. For this reason, Denso plugs do not last longer than NGK units, but they are better at producing powerful sparks.
Is Denso a good spark plug?
When should a Denso spark plug be replaced?
Typically we have found you can expect to get 60,000 to 80,000 miles on an unaltered motor. However, because gradual wear will “round-off” firing points over time, the concentrated firing power and voltage requirement benefits will be reduced. For this reason, Denso advises replacement after 30,000 miles.