4 tip bosch plugs

[Xulfiqar]

The main thing we forget that gap of 4 tip spark plug is adjusted on petrol running engine demand.In our country,most of the cars are running on cng,which require a 20% decrease of spark plug gap.As the gaping of 4 tip is very difficult to adjust as compared to single tip spark plug,so the plug does not perform as expected.I am in plug selling business.Believe it or not,all brands including ngk and denso(which are oem) have equal proportion of complaints.Whether it is due to wrong application,wrong gaping or other mechanical problems.I have experience that 4 tip performs very good in santro,cultus,xli.It usually not performs well in honda civic.

the later santro used wasted spark ignition system - meaning the plugs fired once on compression and also on exhaust. Using multitip plugs can cause massive backfire through the intake if there is any valve overlap. When a waste spark system fires - one plug fires on opposite polarity - because that cylinder is not under compression load and the airgap between the electrodes is easier to ionize.

It is due to this nature the SAAB trionic ignition system can sense compression and relay compression load to the ECU informing which cylinder fired last and what was the compression load - causing it to adjust ignition timing and boost too. Using multitip plugs in a SAAB trionic is "heavy damage time"

[bilal49er]

but the recomened are izfr6j11,ur using hond k series engine plugs

yep ur right boss...in fact i did a lot of online research and found that izfr6k-11 are different to ifr6j11 in only two aspects:-
they have a laser welded iridium ground electrode instead of the platinum on ifr6j and have a projected tip..
heat range, thread reach, hex fitting etc are all the same..and my car has been running wonderfully since then...marked improvement in fuel economy and a clean very light brown colour on the tail pipe!

[shahid.engineer53]

I own Suzuki Swift and going to change the spark plugs to NGK laser irradium plugs.
On the owner manual NGK IFR6J-11 is mentioned while the one I purchased from Auto shop is NGK IZFR6K-11. Should I go with IZFR6K-11? Please suggest.