RX-7 plugs VS RX-8 plugs
09-05-2009 | 10:33 PM
#1
Thread Starter
FLAME ON!
Joined: Jul 2009
Posts: 948
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From: Strip Club
RX-7 plugs VS RX-8 plugs
I ran a set of NGK RX-7 plugs on my n/a 8 for tow weeks.
RX-7 plugs. First tow plugs are leading. Last tow are trailing. See spacers for reference.
[IMG]http://img34.imageshack.us/img34/6323/p9054492.jpg[/IMG]
[IMG]http://img228.imageshack.us/img228/958/p9054494.jpg[/IMG]
Here are the NGK 8 plugs I ran for about 6 months.
RX-8 plugs. First tow are leading. Last tow are trailing.
[IMG]http://img4.imageshack.us/img4/1006/p9054498.jpg[/IMG]
[IMG]http://img4.imageshack.us/img4/9103/p9054499.jpg[/IMG]
Mind you I drive my 8 the way it was ment. Let her warm up. Shift aound 5k or 8k rmps.
What do you think. Can I clean the OEM plugs and reuse them in case of emergency?
RX-7 plugs. First tow plugs are leading. Last tow are trailing. See spacers for reference.
[IMG]http://img34.imageshack.us/img34/6323/p9054492.jpg[/IMG]
[IMG]http://img228.imageshack.us/img228/958/p9054494.jpg[/IMG]
Here are the NGK 8 plugs I ran for about 6 months.
RX-8 plugs. First tow are leading. Last tow are trailing.
[IMG]http://img4.imageshack.us/img4/1006/p9054498.jpg[/IMG]
[IMG]http://img4.imageshack.us/img4/9103/p9054499.jpg[/IMG]
Mind you I drive my 8 the way it was ment. Let her warm up. Shift aound 5k or 8k rmps.
What do you think. Can I clean the OEM plugs and reuse them in case of emergency?
09-05-2009 | 10:58 PM
#2
07 Rx8
Joined: May 2008
Posts: 123
Likes: 0
From: Marshfield, WI
I don't think that 7 plugs are much different than the 8 plugs as you can get pretty much the same temperature range for both plugs. Cleaning the plugs can be done. A good cleaner and soft brush.
People have said not to use a wire brush as that will nick the center insulation and can cause problems. Personally I wouldn't reuse the plugs unless the electrode is in good condition, i.e. not burned down much. But in Rx8's, thats not very often. I replaced the OEM ones after about 8k miles and they were showing a fair amount of burn down. The car did run a little smoother at idle with the brand new plugs in. So take it for what its worth. That small price for keeping good plugs in the car is worth it.
People have said not to use a wire brush as that will nick the center insulation and can cause problems. Personally I wouldn't reuse the plugs unless the electrode is in good condition, i.e. not burned down much. But in Rx8's, thats not very often. I replaced the OEM ones after about 8k miles and they were showing a fair amount of burn down. The car did run a little smoother at idle with the brand new plugs in. So take it for what its worth. That small price for keeping good plugs in the car is worth it.
09-15-2009 | 10:31 PM
#5
Registered User
Joined: Nov 2007
Posts: 49
Likes: 0
From: Bay Area CA!
I ran a set of NGK RX-7 plugs on my n/a 8 for tow weeks.
RX-7 plugs. First tow plugs are leading. Last tow are trailing. See spacers for reference.
[IMG]http://img34.imageshack.us/img34/6323/p9054492.jpg[/IMG]
[IMG]http://img228.imageshack.us/img228/958/p9054494.jpg[/IMG]
Here are the NGK 8 plugs I ran for about 6 months.
RX-8 plugs. First tow are leading. Last tow are trailing.
[IMG]http://img4.imageshack.us/img4/1006/p9054498.jpg[/IMG]
[IMG]http://img4.imageshack.us/img4/9103/p9054499.jpg[/IMG]
Mind you I drive my 8 the way it was ment. Let her warm up. Shift aound 5k or 8k rmps.
What do you think. Can I clean the OEM plugs and reuse them in case of emergency?
RX-7 plugs. First tow plugs are leading. Last tow are trailing. See spacers for reference.
[IMG]http://img34.imageshack.us/img34/6323/p9054492.jpg[/IMG]
[IMG]http://img228.imageshack.us/img228/958/p9054494.jpg[/IMG]
Here are the NGK 8 plugs I ran for about 6 months.
RX-8 plugs. First tow are leading. Last tow are trailing.
[IMG]http://img4.imageshack.us/img4/1006/p9054498.jpg[/IMG]
[IMG]http://img4.imageshack.us/img4/9103/p9054499.jpg[/IMG]
Mind you I drive my 8 the way it was ment. Let her warm up. Shift aound 5k or 8k rmps.
What do you think. Can I clean the OEM plugs and reuse them in case of emergency?
09-16-2009 | 12:45 AM
#9
Registered
Joined: Jul 2004
Posts: 2,196
Likes: 0
From: Northern California
Okay, here's the deal;
Micro-tip spark plugs (Iridiums) were invented as a self-cleaning mechanism. As the current jumps the gap it takes the carbon along with it, thus the self-cleaning aspect. Iridium tips are best suited to do this as they can handle the current with tips as small as .03 and they will not wear away. Let's call the Iridiums the "RE" plugs.
Next up are the Platinum spark plugs. Nice, and better than copper plugs, but certainly not Iridiums. They are the "EQP" plugs and are what we call "FD" plugs. (Spark plugs do NOT go bad in the Renesis as often as people think. As has been stated, as long as the tip and ground strap are not worn so much that they increase the gap too much, they are fine and can be cleaned. Use a plastic-bristle brush and carb cleaner and they are as good as new. I have done this many times with my own plugs. This is axiomatic with spark plugs.) I have tried these plugs in my own engine and I noticed less throttle response and a duller exhaust note.
With an N/A Renesis engine, always use the Iridium plugs. Although it may seem cheaper to use the "FD" plugs, which are either the NGK BUR9EQ and BUR7EQ (which are copper plugs) or the BUR9EQP and BUR7EQPs (which are Platinum plugs), in the long run your performance will lack and you'll end up changing them often enough so as to make the cost equal. With greater grounding area available, the BURs will foul sooner than the REs. Even the EQPs are not quite up to the task of the Iridiums.
In our testing of spark plugs we have learned that with the BHR Ignition System the Iridiums last a LOT longer than do the EQPs (Platinum) and, most notably, the EQ (copper plugs).
Micro-tip spark plugs (Iridiums) were invented as a self-cleaning mechanism. As the current jumps the gap it takes the carbon along with it, thus the self-cleaning aspect. Iridium tips are best suited to do this as they can handle the current with tips as small as .03 and they will not wear away. Let's call the Iridiums the "RE" plugs.
Next up are the Platinum spark plugs. Nice, and better than copper plugs, but certainly not Iridiums. They are the "EQP" plugs and are what we call "FD" plugs. (Spark plugs do NOT go bad in the Renesis as often as people think. As has been stated, as long as the tip and ground strap are not worn so much that they increase the gap too much, they are fine and can be cleaned. Use a plastic-bristle brush and carb cleaner and they are as good as new. I have done this many times with my own plugs. This is axiomatic with spark plugs.) I have tried these plugs in my own engine and I noticed less throttle response and a duller exhaust note.
With an N/A Renesis engine, always use the Iridium plugs. Although it may seem cheaper to use the "FD" plugs, which are either the NGK BUR9EQ and BUR7EQ (which are copper plugs) or the BUR9EQP and BUR7EQPs (which are Platinum plugs), in the long run your performance will lack and you'll end up changing them often enough so as to make the cost equal. With greater grounding area available, the BURs will foul sooner than the REs. Even the EQPs are not quite up to the task of the Iridiums.
In our testing of spark plugs we have learned that with the BHR Ignition System the Iridiums last a LOT longer than do the EQPs (Platinum) and, most notably, the EQ (copper plugs).
+1.... you know your plugs..
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