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Any reason NOT to use Iridium spark plugs? - Engine/Ancilliaries - The Lotus Forums #ForTheOwners Jump to content

Any reason NOT to use Iridium spark plugs?


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I would always recommend to stick with the original plugs.  They are a good decently priced plug and perform well all the way to 500bhp+.

What is your motivation to change?

1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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Thank You for answer.

My car is running fine with no problems considering poor running etc.

I do not know when the spark plugs are changed, so it seems to be reasonable change them.

I did order Denso spark plugs from UK and did not check if they are similar to the original Ngk:s.

Type is Denso K20TT 4604

Originals cost here 55 euros set, so the prize is not a problem itself.

It sound funny to order spark plugs abroad, but these did cost 20.59£ delivered to my door.


"Older I get, faster I was"

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Don't use them.!!!  I did a complete top end (Will Call It) refurbish.  I have a 98 V8 and was replacing the coils, so I had the plenum off and while in there........changed injectors, spark plug wires, coils, ECT sensor, water thermostat (Big Help), and also changed the plugs with Iridium NGK plugs.  Car ran like it was on 4 cylinders.  Changed the plugs to the original heat range NGK plugs and ........when I sarted it I couldnt belive the difference.  IT runs like a beast now.

You could try them, but the stock plugs were really good.   I did need to spray a penetrating fluid down each spark plug hole to help with removing the plugs and them put anti seize on each new plug.  The next guy will appreciate it.


Just my opinion.   Thanks Mark

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