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Discussion Starter #1
HI
i recent bought the NGK IRITOP 7 spark plugs to replace my old plugs (NGK PFR5g-112647) but i fould that the new one is bigger than the old one. i just wondering are they still can fit it at all? am i bought the wrong plugs?
cheers
 

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You mean the new ones are longer? Don't worry about that. Are the threads the same size? They look slightly different but it could just be the picture.
 

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IRITOPS are for RB26DETT engines, for the RB25,i think you need the IRIWAYS, the difference is the length(white ceramic body) as shown in your pics, people do use the RB25 plugs in the RB26 engine but i don't know about the reverse.

Best to sell these and get IRIWAYS or NGK BK**** if you are unsure.
 

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Discussion Starter #4
what happen if i use it reverse?

blueranger said:
IRITOPS are for RB26DETT engines, for the RB25,i think you need the IRIWAYS, the difference is the length(white ceramic body) as shown in your pics, people do use the RB25 plugs in the RB26 engine but i don't know about the reverse.

Best to sell these and get IRIWAYS or NGK BK**** if you are unsure.
 
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