*
This is what I wrote to NGK-Europe in Germany..................
Dear Madam, Sir,
I am the owner of a MAZDA RENESIS RX-8 HP WITH ROTARY ENGINE (231hp) of 2008 (VIN nr. JMZSE173650121340); purchased new; now 57.000 kms on the odometer. My exhaust tips were always very clean / hardly no carbon deposits in/on the tips (I premix synth. oil 1:250 since new)....however since the tips became slightly blackish on the inside I immediately had doubts about the ignition system; expecting the ignition coils (49.000 km) as the problem. However they were ok/excellent, but by renewing the coils, leads and plugs (all after a running period of 49.000 km) I noticed that on the 2nd rotor (closest to the firewall), after popping of the leads, from both Leading and trailing sparkplugs the inner core was broken and left in the leads. Before disassembling the ignition system the performance of the engine both at high rpm and idling was excellent. This is a dangerous situation as it can damage the catalysator and also the engine. In my opinion the broken core's caused the combustion not to be proper/efficient for the last 1.000-1.500 km's. My problem is that the NGK spark plugs-types adapted are exact conform the requirements both of Mazda and NGK Both sparkpugs broke down at 49.000 km which is within the 60.000 km replacement interval Mazda requires. SOME DATA ABOUT MY DRIVING CONDITIONS: * Generally medium distances from 50-150 km (one way); never less than 5 kms; sometimes 20 kms; no high rev's during warming up to 80 degr. C (I have an engine sump oil temp meter) * Sump oil temp. 90-95 (max. 100 in peak hour traffic) degrees C in summer; 85 degrees C in spring and autumn; in winter the car is not used. * Engine oil synthetic 5W30/5w40 * Moderate drive style; never to low in gears; never the high rev's of 8.000 rpm etc. (I am 73 years of age but also have a Lotus Esprit Turbo SE and a Classic Saab 900c) * I am very cautious with this fantastic RX-8 HP and when (dis)mounting the spark plugs I always pay utmost attention to "hand screw in" and caring not to hit the porcelain isolator. I HAVE ENCLOSED 7 LINKS OF PICTURES OF THE DAMAGED SPARK PLUGS. Please advice what to do; was this only a unlucky event (which I could accept immediately) or is there some other reason. Please eventually consult your Japanese collegues of NGK as they have a broad experience and knowledge (of problems) with the Rotary Engine of the MAZDA RX-8
Best regards, Rudolph Wolven
Note: the spark plugs were not stressed by "towing leads".....they were attached flexible.
http://ift.tt/2fbEkOX ... 8bk74z.jpg
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http://ift.tt/2fbEkOX ... jvxpkg.jpg
http://ift.tt/2fbEkOX ... 4d7ogk.jpg
http://ift.tt/2fbEkOX ... yips25.jpg
http://ift.tt/2fbEkOX ... slqyp4.jpg
http://ift.tt/2fbEkOX ... vp78wz.jpg
This is what I wrote to NGK-Europe in Germany..................
Dear Madam, Sir,
I am the owner of a MAZDA RENESIS RX-8 HP WITH ROTARY ENGINE (231hp) of 2008 (VIN nr. JMZSE173650121340); purchased new; now 57.000 kms on the odometer. My exhaust tips were always very clean / hardly no carbon deposits in/on the tips (I premix synth. oil 1:250 since new)....however since the tips became slightly blackish on the inside I immediately had doubts about the ignition system; expecting the ignition coils (49.000 km) as the problem. However they were ok/excellent, but by renewing the coils, leads and plugs (all after a running period of 49.000 km) I noticed that on the 2nd rotor (closest to the firewall), after popping of the leads, from both Leading and trailing sparkplugs the inner core was broken and left in the leads. Before disassembling the ignition system the performance of the engine both at high rpm and idling was excellent. This is a dangerous situation as it can damage the catalysator and also the engine. In my opinion the broken core's caused the combustion not to be proper/efficient for the last 1.000-1.500 km's. My problem is that the NGK spark plugs-types adapted are exact conform the requirements both of Mazda and NGK Both sparkpugs broke down at 49.000 km which is within the 60.000 km replacement interval Mazda requires. SOME DATA ABOUT MY DRIVING CONDITIONS: * Generally medium distances from 50-150 km (one way); never less than 5 kms; sometimes 20 kms; no high rev's during warming up to 80 degr. C (I have an engine sump oil temp meter) * Sump oil temp. 90-95 (max. 100 in peak hour traffic) degrees C in summer; 85 degrees C in spring and autumn; in winter the car is not used. * Engine oil synthetic 5W30/5w40 * Moderate drive style; never to low in gears; never the high rev's of 8.000 rpm etc. (I am 73 years of age but also have a Lotus Esprit Turbo SE and a Classic Saab 900c) * I am very cautious with this fantastic RX-8 HP and when (dis)mounting the spark plugs I always pay utmost attention to "hand screw in" and caring not to hit the porcelain isolator. I HAVE ENCLOSED 7 LINKS OF PICTURES OF THE DAMAGED SPARK PLUGS. Please advice what to do; was this only a unlucky event (which I could accept immediately) or is there some other reason. Please eventually consult your Japanese collegues of NGK as they have a broad experience and knowledge (of problems) with the Rotary Engine of the MAZDA RX-8
Best regards, Rudolph Wolven
Note: the spark plugs were not stressed by "towing leads".....they were attached flexible.
http://ift.tt/2fbEkOX ... 8bk74z.jpg
http://ift.tt/2fbEkOX ... vikqen.jpg
http://ift.tt/2fbEkOX ... jvxpkg.jpg
http://ift.tt/2fbEkOX ... 4d7ogk.jpg
http://ift.tt/2fbEkOX ... yips25.jpg
http://ift.tt/2fbEkOX ... slqyp4.jpg
http://ift.tt/2fbEkOX ... vp78wz.jpg
2 (inner core) broken NGK spark plugs on 2nd rotor after 30.600 mls (incl. pic's)....
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