B10EGV Plugs pulled, have a look!
03-03-10, 03:00 PM
#1
B10EGV Plugs pulled, have a look!
Been running these plugs now for about 3 months now and decided to pull them and see how they looked because this is my first time with these. They have hard weekend driving and two, 2 hour straight road trips on them. Backround on car - Holset WH1E running 20 psi with 50/50 water meth mix. Check em out and let me know what you think!
L1
T1
L2 and T2 look identical to these.
L1
T1
L2 and T2 look identical to these.
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02-25-12, 10:47 AM
#9
^You get what you pay for....... rotor housings aren't cheap either. I'd stay far away from these plugs. Here is an engine recently torn down at IRP that used these plugs for most of it's life. 1 bar boost and 15 track days, around 40k miles:
In the picture you can see an NGK race plug, he had recently switched to these but the damage had already been done.
In the picture you can see an NGK race plug, he had recently switched to these but the damage had already been done.
02-25-12, 12:11 PM
#11
Theorie funny you posted that because I resently lost my previous motor to these plugs. Tip broke off the plug and stuck a seal and ruined the housing. These plugs werent made for our motors they are not the correct reach and they will never be used in my motor again. 40 dollars a plug< a new motor 
02-25-12, 12:16 PM
#12
Racing Rotary Since 1983
iTrader: (6)
so many rotaries have the carbon wings around the sparkplug, it is almost just a question of degree.
the carbon is a "tell" on rotor housings. you almost don't have to get the micrometer out to diagnose what is happening.
the apex seal is not contacting the housing to wipe it clean because it is being uplifted by the sparkplug boss.
think of the area around the plug as a volcano. when the motor gets rolling heat builds around the plug hole and it rises as a volcano would build height. this pushes the apex seal off the housing. the uplift is also the cause of plughole cracks.
the colder the plug the more heat is transferred away from the plug area resulting in less uplift.
we all should run as cold a plug as we can. 10s are o k for street assuming your right foot isn't on the floor all the time and you are making 400 max. i don't believe in the above case the plug caused the problem. it did create the uplift but other probable factors created too much heat for the plug to handle. 10s work fine w AI, proper lube and 400 hp power levels.
the housing also looks like it needed more lubrication. after spending some time looking at 2 cycle oils i have switched to a synthetic and one w a heavy base oil. premix is essential and i would always err on too much rather than too little. i now run Redline.
finally, CPR engines have chamfered leading and trailing plug holes to take a bit of height off the volcano.
my motors do not have the carbon plug wings on them.
hc
the carbon is a "tell" on rotor housings. you almost don't have to get the micrometer out to diagnose what is happening.
the apex seal is not contacting the housing to wipe it clean because it is being uplifted by the sparkplug boss.
think of the area around the plug as a volcano. when the motor gets rolling heat builds around the plug hole and it rises as a volcano would build height. this pushes the apex seal off the housing. the uplift is also the cause of plughole cracks.
the colder the plug the more heat is transferred away from the plug area resulting in less uplift.
we all should run as cold a plug as we can. 10s are o k for street assuming your right foot isn't on the floor all the time and you are making 400 max. i don't believe in the above case the plug caused the problem. it did create the uplift but other probable factors created too much heat for the plug to handle. 10s work fine w AI, proper lube and 400 hp power levels.
the housing also looks like it needed more lubrication. after spending some time looking at 2 cycle oils i have switched to a synthetic and one w a heavy base oil. premix is essential and i would always err on too much rather than too little. i now run Redline.
finally, CPR engines have chamfered leading and trailing plug holes to take a bit of height off the volcano.
my motors do not have the carbon plug wings on them.
hc
02-25-12, 01:31 PM
#13
Racing Rotary Since 1983
iTrader: (6)
"Tip broke off the plug"
i am not totally sure that the solution re broken electrodes is completely solved by buying the $30+ plugs. take a good look at a NGK 6725 new other than a few hours on the road and dyno. notice the cracks in the weld on both sides of the electrode. i have these cracks on every one (24+) of these plugs. while i have not lost an electrode (yet) this is NOT a pretty picture.
i have 2 concerns:
losing the electrode
the cracked protubrance becoming a glowplug/preignition
this is just one more piece of evidence pointing towards the existence of huge amounts of combustion chamber pressure/heat in our motors. 24 psi/514 hp and alot of cooling meth. no knock, just alot of pressure.
i know of no 6725s losing an electrode but given their higher build specs, and given i see cracks, i would be concerned about running something down the food chain.
hc
i am not totally sure that the solution re broken electrodes is completely solved by buying the $30+ plugs. take a good look at a NGK 6725 new other than a few hours on the road and dyno. notice the cracks in the weld on both sides of the electrode. i have these cracks on every one (24+) of these plugs. while i have not lost an electrode (yet) this is NOT a pretty picture.
i have 2 concerns:
losing the electrode
the cracked protubrance becoming a glowplug/preignition
this is just one more piece of evidence pointing towards the existence of huge amounts of combustion chamber pressure/heat in our motors. 24 psi/514 hp and alot of cooling meth. no knock, just alot of pressure.
i know of no 6725s losing an electrode but given their higher build specs, and given i see cracks, i would be concerned about running something down the food chain.
hc
02-25-12, 09:10 PM
#14
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Just to throw this out there also, we run 11.5's in our 1000whp drag car. It's see's 54psi of boost and runs on pure methanol. We have almost zero issues with these plugs and have ran them in every car over 400whp for years and years.
Never had a ground strap break but have of course seen many electrodes worn down from high output cdi's and age.
Never had a ground strap break but have of course seen many electrodes worn down from high output cdi's and age.
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