Effects of using wrong sparkplug gap size?

[Dwoon]

As per the topic, could those familiar kindly enlighten the effects of using wrongly gapped sparkplugs?

 

For e.g. using a 1.1mm instead of 0.8mm gap.

 

Thanks.

[King]

wrong gap, maybe after 3000km of using, when u rev,the limter stop at certain rpmand hang that.

 

like just my case,

but when regap to factory spec, everything back to normal.

[Soya]

inadequate spark travel = misfiring.

[Guyver]

Mis-firing ah.. then must sign extra duty liao...

[Yongwd]

effects may be

 

- poor idling

- poor starting

- sparks emitted from distributor unit

[Yeobh]

Too small a gap or too wide will not allow the sparks to correctly fire and ignite the atomised fuel fast enough. Always use a spark plug gap gauge to set the gap.

[Saaber]

Where can I get that tool?

[Yeobh]

over here http://www.ebay.com.sg/viItem?ItemId=4504531408

[Saaber]

thanks

[Yeobh]

Nice meeting you today - thanx for the purchase and info on torque wrenches. Will try to source some good quality pointer torque wrenches for auction probably early next year. PM me if you need auto specialty tools info

[Saaber]

Nice meeting you too, next time, will call u for kopi when i am in the area...

[Ravinged]

  Quote

wrong gap, maybe after 3000km of using, when u rev,the limter stop at certain rpmand hang that.

 

like just my case,

but when regap to factory spec, everything back to normal.

 

What if using a gap smaller than factory specs? What's going to happen?

 

Ed

[King]

u mia so long

[BMW320i]

misfire ? I know the aftermarkets spark plugs can be used on the BMWs provided they regap every 6 months or so. Not sure about the other makes, maybe the same ?

[Yeobh]

You will have difficulties in starting and the combustion will be incomplete resulting in high fuel consumption and high carbon monoxide in the exhaust.

[Yeobh]

Either the spark plug material just cannot take the high heat/spark erosion or your rid have high energy ignitor or coil.

[BMW320i]

Is there a any significant gains using aftermarket ones ?

[Yeobh]

Looks like more and more european cars sprak plugs must be replaced only with OEM due to the resistance of the electrole.Witht the wrong resistance you get just poor/weak spark KV output. Aftermarket type are Ok but you may have to do trial and error to the one that have performance and durabilty comparable to OEM.