Which spark plug?

[bridster]

Im due to upgrade my roadster to turbo and just wondered if any one could give me a code number or part number for a cooler running spark plug that they use in there turbo'd roadster.
Also i know that in japanese makes like denso the higher the number the cooler the plug, what i dont know is what range is good for our motors?

Any help would be appreciated.
I have also tried the search before anyone tells me off   s:D s:D

[roger]

I put one grade cooler in mine upon recommendation, and have no reason to complain.

I think my OEM was BKR5EY-11, if so I went BKR6EY-11. I can check the exact numbers tonight if you want, though I do beleive MrT might have changed plug specs over the years..

[bridster]

many thanks im thinking iridium plugs mind not mr t's  s:) s:)

[roger]

many thanks Im thinking iridium plugs mind not mr t's  s:) s:)

Your choice, but I wouldn't bother. Nothing wrong with copper, in fact some would say they are better.

[muffdan]

I use these NBK Iridium plugs:

http://store.monkeywrenchracing.com/product_info.php?cPath=43_150&products_id=581

Jason

[bridster]

Sweet. many thanks   s:D s:D

[markiii]

iridium gives you longer service intervals but copper is a better condctor

[custardavenger]

Mine are NGK IFR7G-11KS, I believe they are the same as Denso IK22.

[bridster]

Thanks for the info everyone, all sorted now cheers.

[ad_car_08]

Sorry to rake this back up.

Im not looking at spending £60 on spark plugs(does it really make much of a difference? a spark is a spark, no?), what are the standard type to fit?
Did a little ebay browsing - are these ok?

 m http://cgi.ebay.co.uk/TOYOTA-BOSCH-SUPE ... 240%3A1318 m

 m http://cgi.ebay.co.uk/SPARK-PLUGS-NGK-X ... 240%3A1318 m

 m http://cgi.ebay.co.uk/TOYOTA-MR2-1-8-VV ... 240%3A1318 m

[widermuller]

Bosch super 4's don't do it!!!!!!!!!!! Mine are Denso irridium (don't know the heat range, just a standard plug, but they are good enough for an un-modified engine) cost me 35 quid 2 years ago bought from an online company.

[ad_car_08]

Bosch super 4's don't do it!!!!!!!!!!! Mine are Denso irridium (don't know the heat range, just a standard plug, but they are good enough for an un-modified engine) cost me 35 quid 2 years ago bought from an online company.

Oh, now the super 4s would've been the ones I'd have gone with! Why do you advise against them?
Seem to be finding irridium plugs are big bucks - is it really worth spending ~£40 - £60?!   s:? :? s:?

[muffdan]

http://store.monkeywrenchracing.com/product_info.php?cPath=43_150&products_id=581

$8 each. Not sure what shipping to the UK would be but if you try ordering them the site will quote UK shipping based on their weight.

Jason

[ad_car_08]

£27 delivered.....not bad

thanks muffdan

[widermuller]

Admittedly my car is'nt used enough, but I got the super 4's because they are easy to get hold of and have the 'promise' of being better than a bog standard plug. However, when I got a good price (at the time, uk sourced) I changed to the irridium plugs and noticed smoother running from start up.

                 Lets put it this way.... if you plan to keep the car another 5-6 years, and do average miles in it, you might as well go with the irridium's because you would have spent the same money on ordinary plugs!

[Anonymous]

I wonder that if it would be possible to run surface discharge type plugs (like in an RX7 engine) or some other longer plugs in order to raise the effective CR.... It is something I have been considering for next time I take a look on the shelves at Halfords. Just to get an idea of what will fit.