burned spark plugs,recomended spark plugs for 450hp?
 

is the second time i burn my spark plugs so what you guys recomended me?

thanks

NGK R6725-115 are good but pricey..

Try B10eix ..Iridium plugs..they are inexpensive and will do the trick.
God Bless

BAH

B10EGV's - they are gapable. Gap them at .022

They are not as expensive, and work quite well.

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.

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

non-resistor? you must not run a haltech :p:

go with the 10.5's 33 a plug is expensive but its safer... i try to not go cheap one this car!

X2

I use these and they work really well on my car (400rwhp)
Never had a burning issue

Thats what she said :lol:

Holy thread resurrection Batman!!!


RIP Guitarjunkie28

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.

First off, what plugs are you running now. How much boost are you running on these plugs. If you are burning plugs ( 7's or 9's) and running normal boost then you might have another issue.

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

Good ol' stock 9's.

They've also done well in my engine(s) up to 20-22psi.

Get good life out of them, they're fairly cheap and run well on a cold engine.

Im at 451 RWHP on 17 psi and was told if I dont run the NGK 10.5 my engine would be toast.

+1 on the NGK R7420 or the rebadged Greddy Racing Iridium Spark Plug Pro which is the same plug. Whatever you can find cheaper.

thewird

So has everyone agreed that if money was no object the Iridiums' are the way to go , before chosing a specific model.

For street use, what would be the most you could run on Ngk 9s all around? I plan to run 475whp at most. Will they hold on a good tune?

I would go to 10's at that power level. I was at mid 400's on b9egv's and when i changed them to the greddy race plugs they looked like they had been retaining too much heat.

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

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.

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

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.

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...

I run NGK R7420s 10s for Leading 11 for Trailing

I ran the non resistor plugs with the twin power for about a year with no issues, but i did hear some people had trouble with the boxes.