a bit of spark plug trivia - Honda Prelude Forum

schwett · 08-20-2001, 01:43 PM

the ngk plug "zfr7f-11" is the copper version of the plug that comes with the car, but one step colder. it comes out of the box with a .44" gap (too much for FI). the plug "zfr7f" is the exact same plug, but with a .32-.35" gap out of the box. you can find the zfr7f in stock at most honda marine shops... i got a set of these, then got worried when i noticed that everyone else was running zfr7f-11. ngk confirmed for me that it's the same plug otherwise. they also said that even though the gap is specified with the plug, it should always be checked!

00G · 08-20-2001, 02:38 PM

How much did you buy them for? I had to order them through summitt, no auto parts store could even understand what I was looking for....A copper plug one step colder than the oem. One e-mail to ngk and I got an answer is 24hrs. Woohoo!! I've been using some Bosch Platinums, but I feel the tip is too shrouded....

schwett · 08-20-2001, 04:27 PM

i dunno, they were like $2 each. not enough to bother remembering how much they cost. i also had those bosch +4 plugs when i got the jrsc installed. it runs a lot better with the 7s.

Quote:

Originally posted by 00G
How much did you buy them for? I had to order them through summitt, no auto parts store could even understand what I was looking for....A copper plug one step colder than the oem. One e-mail to ngk and I got an answer is 24hrs. Woohoo!! I've been using some Bosch Platinums, but I feel the tip is too shrouded....