Plug change on Apex

[Srxspec]

Next, we reconnected the evac , reinstalled the ECP filters and tried the Iridium spark plugs. (CR9EIX) There was no comparison. The CR10EK sparkplugs crushed the CR9EIX sparkplugs. There was a power loss everywhere with the CR9EIX plugs.

Next we set the sled back up with the CR10EK sparkplugs and wanted to see if dynorun .003, which was the best run until then could be replicated. We did replicate the power almost identically. If anything there was slightly more power at peak by the last dynorun (.007) but the gain was very minimal. So we did successfully repeat the power attained earlier and backed it up twice.

This is cheap horsepower guys and is worth doing this mod.

Dynorun.011. We removed the aluminum velocity rings and tried a special sparkplug that I like to use on our real fast Suzuki Hayabusa, GSXR 1000 and Kawasaki ZX12 motorcycles. We install NGK CR10EK spark plugs. The result was just as we see with the bikes. We made more power in lesser time. 6.4 foot pound torque and 4.4 HP improvement at 3700 RPM, 2 foot pound and 2 HP at 5000 RPM, 2.4 foot pound and 2.6 HP improvment at 5800 RPM's and from there on it makes more power but ends up linearlly trailing off all the way to the rev limiter. Definately worth the price of these expensive sparkplugs!

The coldest sparkplug your ignition will fire will produce the most power. This is not my opinion...it is known fact by every smart tuner and engine builder in every industry wether it be snowmobiles, automobiles etc.

They are indeed good for every temperature range.

We use this same sparkplug in every single motorcycle that has that size hole. Hayabusa, GSXR1000, GSXR750, GSXR600, ZX12, ZX10, ZX7, ZX6 and more. I have proven over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over and over that the CR10EK's make more power than stock plugs. I could honestly say that I could produce more than 1000 dynoruns of sleds and motorcycles proving this to be true.

No Iridium sparkplugs do not make as much power.

Freddie

The iridium sparkplugs make quite a bit less power than the CR10EK;s do. I have proven this on the dyno as well as the race track.

Some information from Supertuner in past posts.

 

[87gtNOS]

ok, here is what is happening here..on the dyno you could see more HP with a plug change. But it's not because of the DUAL ground strap. It's from the heat range being colder.

******BUT...the downfall to this is....*******

The CR10EK is pulling more heat out of the chamber allowing the fuel to burn longer(this is what a colder plug does). While this is happening the heat is going into the PLUG. The 2 ground straps can't dissipate the heat as quickly as the ceramic in the spark plug can.
Now what happens is you get 2 HOT ground straps after prolonged hard running, and they could fall off.
They may go out the exhaust, they may ding a valve, they may????

3 simple rules.....

more octane=one jet size=colder plug

This being said, they all do a similar thing.
More octane slows the burn down, can prevent leaness at lower rpms.
One larger jet size add more fuel, sorta covering up the slow burn a higher octane can do.
Colder plug doesn't burn fuel as fast, same as more octane..kinda like adding more fuel via a larger jet.

Do you see the similarities?? All have the same affect, with slightly different characteristics.

To add to this..wait and see SUPERTUNER add more fuel to the APEX on top and gain HP via a boondocker fuel thingy.

Freddie says what I believe I posted a long time ago..the colder plug is making the power, not the EK. The stock plugs DON'T come in a '10', so the closest is the CR10EK plugs.......
If we had a CR10EB (stock is CR9EB), then that would be fine, but we don't.

 

[87gtNOS]

Colder plugs, pull heat out of the chamber, through the PLUG!!! That is how it works....The spark isn't what is colder.

 

[ReX]

Colder plugs pull heat out of the center electrode of the plug by having a shorter thermal path between the electrode and the body of the plug.

The amount of heat flowing down the center electrode of a plug is insignificant compared to the amount of heat that flows out throught the highly conductive aluminum head and cylinder walls (much larger area and much better conductivity than the center electrode).

The overall temperature of the gasses in the chamber (cylinder) will not measurably change between two plugs unless the way the plug ignites the fuel changes (pre-ignition for example with a hotter plug).

A different temperature at the tip of the spark plug changes the way the combustion initiates and how the flame front propegates within the chamber. This is what is altered between hotter and colder plugs and can make more or less power.

The temperature of the "spark itself" is driven by the amount of energy applied to the plug and the gap.

The shape of the center and ground electrodes can also effect the ignition and flame front, but most of the time it's the temperature at the center electrode that makes the biggest difference (CR10EB's might make as much power as CR10EK's).

 

[87gtNOS]

The overall temperature of the gasses in the chamber (cylinder) will not measurably change between two plugs unless the way the plug ignites the fuel changes (pre-ignition for example with a hotter plug).

I like your post!!

Here's another example of what I posted earlier. The colder plug slows down the burn, thus preventing pre-ignition....

 

[alaskanbowtie]

the colder EK plug slows down the burn helping stop the possibility of detonation in the chamber........ is this what your saying ? (87gt)
If that's the case then it shouldn't make a diference which octane you run , or should you run a higher octane fuel to prevent the fowling in warmer weather, say 40's 50's i.e. spring temperatures we ride in. .

 

[byoffcr]

Knapp runs these on his turbo with NO, Zero, Zip, problems at long high speeds.. John Wheelock says these work also. They also run them in there stockers with no problems with lots of miles on there sleds.

 

[87gtNOS]

Knapp runs these on his turbo with NO, Zero, Zip, problems at long high speeds.. John Wheelock says these work also. They also run them in there stockers with no problems with lots of miles on there sleds.

He does, does he...what kind of top speeds have you seen him get with his turbo? How many true miles has he done this year with his turbo??

 

[byoffcr]

How many did he put on last year ect.?. Any problems with his or any other tubros I have seen had nothing to do with the plugs.

 

[87gtNOS]

Knapp had problems with his turbo??

 

[byoffcr]

Knapp had problems with his turbo??

I didnt say he had a problem . I said the problems I have seen on turboed sleds had nothing to do with the plugs, also I am not disagreeing with u when you say the difference in heat ranges and how they react, What I am saying I have never seea a sled go down due tro running these plugs. Have you?

 

[alaskanbowtie]

Knapp had problems with his turbo??

I didnt say he had a problem . I said the problems I have seen on turboed sleds had nothing to do with the plugs, also I am not disagreeing with u when you say the difference in heat ranges and how they react, What I am saying I have never seea a sled go down due tro running these plugs. Have you?

>>>>>
This is my question in a nut shell ! How many sleds have had any engine problems related to these plugs ? How many have seen one of the electrodes burnt off or partially burnt off ? When you guys say hard starting then what exactly do you mean.......... cranks for a minute or just cranks 3 or 4 times before starting ? Is it worse in sub zero temps ? I usually only ride from 0 to 65 degrees so if this is the case it shouldn't matter anyway.

 

[byoffcr]

Knapp had problems with his turbo??

I didnt say he had a problem . I said the problems I have seen on turboed sleds had nothing to do with the plugs, also I am not disagreeing with u when you say the difference in heat ranges and how they react, What I am saying I have never seea a sled go down due tro running these plugs. Have you?

>>>>>
This is my question in a nut shell ! How many sleds have had any engine problems related to these plugs ? How many have seen one of the electrodes burnt off or partially burnt off ? When you guys say hard starting then what exactly do you mean.......... cranks for a minute or just cranks 3 or 4 times before starting ? Is it worse in sub zero temps ? I usually only ride from 0 to 65 degrees so if this is the case it shouldn't matter anyway.

Turns 2-3 times more than normal. I have started my sleds at -27 with these plugs. Hope this helps. byoffcr

 

[Rockmeister]

Gotta LOVE this!!! I ordered 4 CR10EK spark plugs from Advance Auto last night at 8PM (FRIDAY NIGHT!) I got them today (Saturday) at NOON! They were about $25. I was AMAZED at the turn around! WOW!

 

[SharkAttak]

pulled the cr10ek's from last season install and put new ones in had 3,000 mi. on they with no problems at all, figured while it had it ripped apart to do the oil and filter i'd slap a new set in and keep old ones for spares