Bosch Super 4 Plugs

[Phalanx]

How to know the part no for my car? Is there any website?

 

Where can I get them?

[Phalanx]

I know the part number now, anyone knows where to get a box?

[Mondeo]

Waterloo street.

[Chris_ck]

Autobacs i used to go buy from them. Even if you dunno the part number just tell them your car model and they'll know which part number

[Alfpoon]

did you find the website? care to share?

[Toonstar]

share the site plz.

 

How to convert denso or NGK spark plug number to Bosch plugs specification?

[Vtim]

You can try this site :

 

http://www.densoiridium.com/crossreference.php

[Toonstar]

thanks.

[Ek3stage]

just get the one with X label.... it means gap 1.1mm.

 

I use FR78X...so i reckon its the same part no also...anyway u go Tanly (ie the waterloo one) ask he will know...they very friendly.

 

but a word of caution...the burning is not too good..though got 4 electrodes.....it will largely use 1 only...and i mean 1 throughout...and so u will realise 1 side burned but the other sides look like new.... i dunno where this is isolated case but i have since gone back to good o' densos

[Toonstar]

you drive same car as me??

[Toonstar]

i wonder got other "cheapo" "performance" plugs besides bosch super4 or not??

 

I know change copper plug regularly better..but if use got brand like denso or NGK..can show off and feel better lah! LOL!

[Ek3stage]

Nope me civic, but the part no for japanese cars are about the same. I use the same plugs on another corolla and an older lancer than yours.

 

U driving the MX.... actually I dont know same part no onot, at least the GLXi is.

 

But definitely the gap is 1.1mm.

 

Denso's U groove plugs are the best I ever used! but sometimes I use stock NGK if I cant find the Denso plugs.

[Esky]

Actually multiple electrodes LOWER the firing performance, according to a technical article I read on www.ngksparkplugs.com. NGK also has a 3-electrode plug called Multi Power or something, and they wrote there that this design is good for starting, but actually hampers performance bcoz the multiple electrodes get in the way of the spreading flame.

 

But I guess multiple electrodes is also good for long-lastingness as there're more area to spread out the wear & tear. Just like how I've read about ppl using Bosch Super-4 being able to use them for more than40k km, even 60k km, without much problem.

 

I've been studying the premium/racing plug designs from various manufacturers like NGK, Autolite, SplitFire, Brisk, AC Delco, etc. and noticed the following are needed for a performance plug:

 

1. Side electrode that doesn't cover the top of the central electrode, eg. Super-4, NGK Racing plug, Autolite NASCAR Racing plug, Brisk Premium/Racing plugs, Halo spark plug. Uncovered central electrode doesn't need the flame to take corners to avoid the side electrode and therefore the flame spreads faster, and I've modded my normal NGK BP6ES plugs and confirmed this;

 

2. Larger spark gap is better as more air/fuel mixture is exposed to the spark, and our normal air-gap is not that good. Surface-air gap is better, eg. Super-4, Brisk Premium range, Torque Master, etc.;

 

3. Small firing points lower the firing voltage, and therefore it's easier to spark. Therefore fine platinum/iridium electrodes are good for this. But I've also read that a lowered firing voltage actually REDUCES the BHPs, and you need to enlarge the gap to compensate.

 

U can surf these sites for the plugs I mentioned:

 

www.ngksparkplugs.com

www.halosparkplug.com

www.torquemaster.com

www.brisk.cz

www.acdelco.com

 

Enjoy!

[Ek3stage]

In theory the spark will always use the shortest distance to travel, which is logical since lowest resistance.

 

And the Super4 being a multiple electrode, by right once the electrode with the shortest gap is burned off, the next electrode with the shortest distance would be used...and hence on paper it means if all 4 are used, it should last >40k comfortably. However I have checked my plugs after 15k and the same electrode is still being used, perhaps I can snip off that electrode.....

 

Those who had used the Super4 up to 40k...I wonder whether they had taken out the plugs and check the burning in individual cylinders... For me the burning is uneven. Perhaps I will try another set and monitor again.

 

The spark gap is 1.1mm and off the shelves plugs are already pre-gapped to specs, I have never tried changing the distance and no intention to, re-gapping would seem to weaken the metal and anyway using an improved ignition system for more powerful spark would yield more positive results.

[Esky]

Yeah, I've noticed that most plugs come pre-gapped at 1.1mm, but the farnee thing is that, for Protons, the 1.3 & 1.5 at least, the recommended gap is only 0.8mm. But for Mitsubishis of similar engines, when I checked the part number on the NGK site, the recommended plugs are all 1.1mm... Even the twin turbo 3.0 6G72 engine's recommended plugs are 1.1 mm... normally turbo cars require lower gaps due to the denser air/fuel mixture.

 

1.1mm is the norm for normal plugs with air-gap, but for those with surface-air-gap, the gap can be up to around 3mm! Torque Masters has plugs with gaps of between .12 to .14" (abt 3 to 3.5mm), and which they claim only requires normal firing voltage. Brisk LGS also has gaps of nearly 3mm, as stated on their website.

 

Personally I've been experimenting with plugs with cut-back side electrode, and found that 1.2mm was still ok. Now running with 1.4mm but there's some hesitation... but if that improves fuel economy, then I don't mind too much! Been reading an article on spark plugs and the writer said that you can open up the gap slightly for better fuel economy and low-rev driving. However, if you're after max BHPs at hi-revs, then the gap shd be maintained at the OEM spec, or even lowered slightly for more consistent successful firing.

 

And, with normal "covered" central electrode, don't open up the gap too much, as the side electrode needs to be parallel to the central electrode's flat surface.

 

Been itching to upgrade ignition system to hi-voltage ones, so that I can run even bigger gaps, but... boh lui leh... From friends who used to play with hi-voltage coils, they all said power was better along with improved fuel economy.

 

Anyone here playing with upgraded ignition like MSDs? What's the price like aar?

Edited December 18, 2002 by Esky

[Toonstar]

Glxi and MX not the same...i always tot they are, but the parts are not interchaneable...one is DOHC..the other is SOHC.

[Ek3stage]

I know they not the same but cannot use? I use the same plugs on my last SiR and current VTi.... also sohc and dohc difference.... oh well just stick to user manual and if not using stock specs do monitor the exhaust smell and plugs condition regularly.

[Toonstar]

1.6 GLXi for denso is IK20...for 1.5 MX is IK16.

 

Actually for sparkplug..u use a different but one factor of a heat range..won't affect much lah.