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136 Rapid 1.3 spark plugs


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Hi. I recently became owner of a 136 Rapid, 1.3, manufactured in 1989. According to a couple of car spares websites, my car should be fitted with NGK BP6HS spark plugs. But when I tried to fit these, the nut is too big & I can't get the plug spanner to fit . The car came with NGK BP7EFS plugs fitted.... are these the right ones to use ? I do have some running issues with the car at the moment & am trying to eliminate various things. It would help a lot knowing which plugs should be fitted. many thanks for any help...

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If your car is fitted with the longer plugs the electrodes will be touching the pistons at high revs because they will protrude too far.....that would cause issues! I did this once and the engine did run but closed the electrodes up and ran like a dog! Worth swapping for the correct ones......doesn't matter much if you use 6 or 7 on the heat rating.

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Those are both 14mm (BP) but different heat grade (6 is hotter than 7) and thread length.

 https://www.ngk.de/fileadmin/Dokumente/EN/downloads_not_used_in_download_area/ngk_zuendkerzen_code_en.pdf

 

In fact, the one plug probably won't fit (correctly) in a mount machined for the other.

Thanks Ken.

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If your car is fitted with the longer plugs the electrodes will be touching the pistons at high revs because they will protrude too far.....that would cause issues! I did this once and the engine did run but closed the electrodes up and ran like a dog! Worth swapping for the correct ones......doesn't matter much if you use 6 or 7 on the heat rating.

Thanks. The 7's are longer, but on the 6's, the hexagonal nut is bigger, & fits so close to the cylinder head, that I can't get the plug spanner around to tighten them. I guess I'll keep on using the 7's, unless something nasty happens. Just wondered what other people use....Cheers.

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