Technical Tips > Post 84
Spark Plugs
Adam:
Here's an interesting article on spark plugs:
http://www.silverbulletrx7.com/plugs/
(unfortunatly the article is targeted at, but not exclusive to- rotarys)
He compares a lot of hi performance plugs out there, as well as the more superior designs out there like the Brisk's (whom apparently have a power increase on the dyno in a piston engine):
and Torque master:
But if you go with the conventional design plugs theres prolly not a lot in it- the best thing to do is to index them.
Adam
77CVT:
--- Quote ---Originally posted by Thunder Kiss
Thanks for the replies, next question.
I pulled a plug and found it to be an NGK BPR6FS. NGKs web site states I should be using a UR5.
What's the difference? The car runs fine with BPR6FS.
--- End quote ---
That plug should be fine. B is 14mm, P is projected tip, R is resistor type (all our cars should have these), 6 is a colder plug than the normal 5, FS is tapered seat.
I think I ran 5FS in my '85. It maybe different for an alloy head.
Explanation
Thunder Kiss:
Thanks for the info, I ended getting another set of BPR6FS plugs but I might try 5's next time to see what difference it makes.
White Rider, I understand the theory of indexing but how do you actually get the electrode pointing the right way? A spacer of some kind? Also, do you think it's worth it in an almost standard road car?
77CVT:
--- Quote ---... but how do you actually get the electrode pointing the right way? A spacer of some kind? Also, do you think it's worth it in an almost standard road car?
--- End quote ---
I do it on my cars (vettes). it is easier with the heads off (obviously) but with them on, make a mark with a marker pen where the electrode opening is and see what plugs end up pointing to the exhaust valve (or close to). I've found you'll get 5-6 in a good position but I got lucky with the last lot and got all 8 pointing in the general vicinity.
There are copper washers available to help indexing, but for the cost I don't feel it is worth it.
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