zfr7f-11 - Honda Prelude Forum

alphajesse · 12-02-2003, 11:21 AM

I sent an email to NGK last night, regarding BKR7E vs. ZFR7F plugs with nitrous use. I did this because I noticed the ZFR plugs have a longer reach than the BKR plugs.
Here is what they had to say:

Quote:

Sent from NGKHello,

You want the shorter insulator and ground. If you use the ZFR series it
could fatigue and fall into the combustion chamber. The BKR7E is a good
choice.

Jon MacQuarrie
Technical Customer Service Representative
jmacquarrie@ngksparkplugs.com

-----Original Message-----
From: alphajesse@yahoo.com [mailto:alphajesse@yahoo.com]
Sent: Monday, December 01, 2003 9:52 PM
To: NGK Form
Subject: NGK Form Mail

**** Contact Form & Tech Info Feedback ****

Email From: alphajesse@yahoo.com
VehicleType: 2001
Make: Honda
Model: Prelude
Year: 2001
Engine Type: 2.2L I4 DOHC
Comments: I run ZFR6F-11 plugs most of the time, but also run a 50 hp
shot
of nitrous oxide occasionally. In that event, I run BKR7E on the
reccomendation of a fellow Prelude owner. These have been serving me
well.
Comparing the plugs today, I notice the reach of the ground strap and
electrode is much shorter on the BKR7E plug. Would I be better off
locating
ZFR7F plugs?
When: 12/1/2003 9:52:14 PM

END OF REPORT

Short version: avoid n2o and ZFR series plugs, as they may break off and fall onto your pistons.

eu4ik · 12-02-2003, 10:56 PM

im runnin the 7f's right now. thats not a good thing to read. kind of strange...

alphajesse · 12-02-2003, 11:06 PM

MAybe try running 2 steps colder if you want to keep the zfr plugs.
Here's a pic of the difference in reach.

vooboo13 · 12-03-2003, 09:51 AM

Yeah.. I have a box full of zfr's. Hm... this isn't good.

alphajesse · 12-03-2003, 11:42 AM

Just pay more attention to them when spraying.
I doubt they will immediately break off.
Remember, I was asking if staying with the BKR7E was better than tracking down ZFR7F-11, he just told me what I was using was a better choice for a n2o application.