burned spark plugs,recomended spark plugs for 450hp?
#4
Eye In The Sky
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NGK BnEGVs are the best bang for the buck out there. Even better than the BnEIX iridiums because the iridiums are resistor plugs and deliver less power to the spark.
The voltage potential to jump a gap is determined by the resistance of the gases in the gap, but current flow is determine by the total impendance of the circuit.
Less total impendance means more current flow and thus more power at the gap.
The voltage potential to jump a gap is determined by the resistance of the gases in the gap, but current flow is determine by the total impendance of the circuit.
Less total impendance means more current flow and thus more power at the gap.
#5
BDC Motorsports
If you plan on road-racing that car at that power level, convert to NGK R6725-105's. That's 1.5 "heat" ranges colder than the BUR9EQ's. Otherwise, if it's a street car, BUR9EQ's all around will be plenty. Are you sure you have enough spark behind the plug in the first place?
Be very careful if you switch to a non-resistor plug, especially if using an aftermarket standalone system -- the resistor in the plug helps keep RF noise from travelling over to the trigger harness, thereby lousing your computer's engine RPM reading up.
B
Be very careful if you switch to a non-resistor plug, especially if using an aftermarket standalone system -- the resistor in the plug helps keep RF noise from travelling over to the trigger harness, thereby lousing your computer's engine RPM reading up.
B
#6
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Originally Posted by cewrx7r1
NGK BnEGVs are the best bang for the buck out there. Even better than the BnEIX iridiums because the iridiums are resistor plugs and deliver less power to the spark.
The voltage potential to jump a gap is determined by the resistance of the gases in the gap, but current flow is determine by the total impendance of the circuit.
Less total impendance means more current flow and thus more power at the gap.
The voltage potential to jump a gap is determined by the resistance of the gases in the gap, but current flow is determine by the total impendance of the circuit.
Less total impendance means more current flow and thus more power at the gap.
non-resistor? you must not run a haltech
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#11
Rotary Freak
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STAY THE HELL AWAY FROM B ANYTHING EGV.
UNDER any moderate to high hp level, your gaps on a egv plug will quickly go from .7mm and to 1.2mm and thats only the beginning.
R7420 is my first choice, for a road car get 10 heat range, for race car get 11.5
If not that plug
R6725
DOnt bother with any other crap.
UNDER any moderate to high hp level, your gaps on a egv plug will quickly go from .7mm and to 1.2mm and thats only the beginning.
R7420 is my first choice, for a road car get 10 heat range, for race car get 11.5
If not that plug
R6725
DOnt bother with any other crap.
#12
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I run 17-20 psi on the street and run stock 9's all around. I make about 500HP and have been running 9's for a long time on the street. They don't foul easily and start up very well in winter, even on E85.
When I run 30psi I swap out to NGK 11.5's I will not run more than 20psi on the stock 9's just to be on the safe side.
Anthony
#15
Lives on the Forum
iTrader: (8)
STAY THE HELL AWAY FROM B ANYTHING EGV.
UNDER any moderate to high hp level, your gaps on a egv plug will quickly go from .7mm and to 1.2mm and thats only the beginning.
R7420 is my first choice, for a road car get 10 heat range, for race car get 11.5
If not that plug
R6725
DOnt bother with any other crap.
UNDER any moderate to high hp level, your gaps on a egv plug will quickly go from .7mm and to 1.2mm and thats only the beginning.
R7420 is my first choice, for a road car get 10 heat range, for race car get 11.5
If not that plug
R6725
DOnt bother with any other crap.
thewird
#19
Lives on the Forum
iTrader: (8)
I run 9 leading and 10 trailing on the greddy race plugs and it seems to work well. They're still clean after 10,000 km and seem to have a good burn. I went with a 10 trailing because when I opened my motor after only 2,000 km, the trailing plug area seemed to have some sort of burn mark from my guess running too hot for the power.
thewird
thewird
#20
wannaspeed.com
iTrader: (23)
Yeah my b9's were awful looking, Burned and just shitty, they didn't last long either. Too hot might have been part of the reason they didn't last. A colder plug might have lasted me longer, but everyone was raving about the greddy Race plugs so I had to give them a try, all 10's for me. No fouling or start issues so far with colder plugs.
#21
Racing Rotary Since 1983
iTrader: (6)
factors other than boost that determine plug performance:
ignition
bigger coils and amps can easily burn electrodes. i run two Jacobs FC3000 amps and two MSD 8253 coils on my lead plugs. the neat thing about the amps is they have a cruise output mode so the poor old plug isn't getting full ignition power until acceleration is sensed. i run the NGK 6725s full time.
AI
AI greatly extends plug life as it cools CCP and reduces heat spikes
Fuel type
some run E85 which is mostly alcohol... same result as AI only not just in boost
Tuning
spark advance
as a side note... i see lots of (generally small) cracks around the sparkplug boss as i disassemble engines. my theory is too hot a plug. it is generally better to err on the side of too cool.
hc
ignition
bigger coils and amps can easily burn electrodes. i run two Jacobs FC3000 amps and two MSD 8253 coils on my lead plugs. the neat thing about the amps is they have a cruise output mode so the poor old plug isn't getting full ignition power until acceleration is sensed. i run the NGK 6725s full time.
AI
AI greatly extends plug life as it cools CCP and reduces heat spikes
Fuel type
some run E85 which is mostly alcohol... same result as AI only not just in boost
Tuning
spark advance
as a side note... i see lots of (generally small) cracks around the sparkplug boss as i disassemble engines. my theory is too hot a plug. it is generally better to err on the side of too cool.
hc
#22
rotorhead
iTrader: (3)
Stay away from the BR10EIX. They can't take the high rotary EGT. I have had porcelain insulators break on them even when the car wasn't detonating.
The B10EGV should not be used with an HKS Twin Power. HKS specifically says not to use non-resistor plugs. You also have to use the skinny plug socket which is annoying. I have a friend who uses the Greddy racing plugs, but I'm not baller like that so I've switched back to the BUR9EQ and just plan to keep my EGTs down with careful logging.
The B10EGV should not be used with an HKS Twin Power. HKS specifically says not to use non-resistor plugs. You also have to use the skinny plug socket which is annoying. I have a friend who uses the Greddy racing plugs, but I'm not baller like that so I've switched back to the BUR9EQ and just plan to keep my EGTs down with careful logging.
#23
Senior Member
iTrader: (4)
NGK R7420 / greddy race plug
NGK R6725
Denso IRE01
IMO these are the only plug rotary should run, they come in the CORRECT heat ranges and are designed for rotary. Ive run the NGK R6725 and was happy however my leadings wore out in 2-3000miles, due to MSD amp. Im currently running the Denso IRE01 (NGK heat range equivelant of 10.5/11.5) They can be bought by the piece and I wanted to run colder trailings. NGK plugs can only be bought in a set of 4...
NGK R6725
Denso IRE01
IMO these are the only plug rotary should run, they come in the CORRECT heat ranges and are designed for rotary. Ive run the NGK R6725 and was happy however my leadings wore out in 2-3000miles, due to MSD amp. Im currently running the Denso IRE01 (NGK heat range equivelant of 10.5/11.5) They can be bought by the piece and I wanted to run colder trailings. NGK plugs can only be bought in a set of 4...
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