racingbougie?
Geplaatst: wo 05 jul, 2006 11:25
Kan iemand me de nummer geven van een goede racingbougie voor in mijn Z400 '05?
If you own a bike with 10mm spark plugs, try NGK CR9EK spark plugs. (They come standard on the Yamaha R6 and the ZX9.) They're the ones with double electrodes. F2s, F3s, and F4s FZRs, ZX6s, 7s and GSXR's all use the single electrode type, and can be improved by switching.
I've tested most every type of spark plug available. There are some "racing only" plugs that go for over $40 each !
The NGK CR9EK or NGK CR10EK are the only ones I've ever seen make a power difference. They cost about $7.00 - $9.00 each. The gain is from 1 to 2 horsepower increase, depending on the condition of the plugs you're replacing. That's a huge money to power ratio!
The "9" or "10" number refers to the heat range, which also doesn't matter. (it really doesn't)
The "EK" refers to the fact that they have dual electrodes. There isn't any advantage to having 2 electrodes. Think about it: You can't beat physics and get 2 sparks at one time. (That's the "Splitfire Theory")
Why Do They Work Better ?
One reason the CR9EK's or CR10EK's make more power is because they take up more space in the combustion chamber, which increases the compression ratio. The second reason is that the spark is .040" / 1mm deeper into the combustion chamber. I think that increases the burning efficiency at high speeds.
They work so well that Yamaha uses installs them in the R6 from the factory.
One word of warning: they have to be replaced more often since the last thread of the plug extends into the combustion chamber. This means that as the thread on the plug gets loaded with carbon over time, it can damage the threads in the head on the way back out. If you don't want to change your plugs once a season, these aren't for you.
Dat staat er ook bij, die twee vonken maken niets uit.tuumke schreef:Even off topic:
Dat van die compressie verhoging, daar kan ik in komen, alhoewel het niet echt gezond is voor je bougie maar dat van die dubbele vonk vind ik ook nogal onnozel. Een vonk is een vonk, of daar nu een holbewoner met 2 vuurstenen op het juiste moment een vonk maakt of een bougie van 70€ die dat doet, als het mengsel ontbrandt, dan ontbrandt het of je nu 1 mini vonk hebt of 10 reuze vonken.
Ik zei toch:Alfredo schreef:Dat staat er ook bij, die twee vonken maken niets uit.![]()
"The "EK" refers to the fact that they have dual electrodes. There isn't any advantage to having 2 electrodes. Think about it: You can't beat physics and get 2 sparks at one time. (That's the "Splitfire Theory")"
tuumke schreef:... maar dat van die dubbele vonk vind ik ook nogal onnozel.
'Ralph schreef:Dat is bijvoorbeeld het idee van die Denso bougie (als het werkt), een krachtige vonk geeft een optimale verbranding.