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JT Miles
Joined: 29 Jul 2005
Posts: 826
Location: United States, Illinois,
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 Posted: Fri Apr 20, 2012 3:14 pm Post subject: Kid Kart C-50 |
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My son runs in the restricted class with K&N filter..engine is blueprinted... We use a NGK BPM7A plug..Is that a good choice or is there a better plug? thanks for any help...
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Miles Racing
2nd Place 2012 Kid Kart Nationals
Energy Kid Kart/ CKS C51
Birel Kid Kart/ LAD C51 #7C
Intrepid/MY09 Comet Leopard #722
Emmick/K78 and TT25 |
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al nunley
Joined: 13 Nov 2006
Posts: 3035
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| Posted: Sat Apr 21, 2012 7:49 am Post subject: Re: Kid Kart C-50 |
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| JT Miles wrote: | | My son runs in the restricted class with K&N filter..engine is blueprinted... We use a NGK BPM7A plug..Is that a good choice or is there a better plug? thanks for any help... |
I know very little about the C-50 or the plug you’re using, but when I raced, I always used the coldest plug in the type I was using.
Where does your’s fit in that range of plugs?
What does a new plug look like after a few hard laps?
I always liked to see just a “tiny” bit of color. If the mixture is just right, and the plug is just right, even a little “less” color would be good. I had a father and son team that I helped with a KT and his plug would come out dead white. He won two Championships in SoCal so it couldn’t have been all that bad.
Try different plug types. Try hotter and colder. Lap times will be a good indication of what is better, or not.
Watch the air density. A wrong plug could look good with good air. And vise versa.
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If the data does not support the theory, get a new theory. (Al Nunley)
All else being equal; Compression is the Holy Grail.
45 years, in and around karting |
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Jean Stafford
Joined: 19 Jul 2001
Posts: 324
Location: United States, Ohio, Dayton
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| Posted: Thu Apr 26, 2012 10:23 am Post subject: |
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JT.
We ran a DENSO plug w24 thru W27.
CCarb is biggest gain in performance. Check for burrs!
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Jean Stafford
Stafford's Racing
Dayton, Ohio
ROTAX Repair station,
jean@sgandt.com
Started Karting in 1959
"Some people are like 'Slinkies', worthless, but they bring a smile to your faqce when you push them downstairs." |
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Chris Pacitto
Joined: 14 Jan 2011
Posts: 25
Location: United States, Florida,
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| Posted: Fri Apr 27, 2012 5:09 am Post subject: |
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You said he is in a restricted class... I'm assuming that means you need to have a restrictor pill in the carb, is that correct?
Without a restrictor, it seems a K&N gives more top end power but less low RPM torque. Do you find the same thing happens when using a restrictor?
Just curious |
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Ron Gordon
Joined: 27 Dec 2009
Posts: 150
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| Posted: Fri Apr 27, 2012 3:50 pm Post subject: |
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JT,
There are several good plugs out there for the Comer C50:
Bosch WS5F (Comer Original), Champion CJ7F, Autolite 2974, Denso W22MP-U, and the NGK BPM7A.
I found the Bosch to be a good plug for my Stock Comer wjth the gap at .28 and the NGK was best for my Blueprinted engine with a gap of .35
What ever plug you choose never use the plug washer, you want the electrode to get as deep as possible into the engine.
Also, you didn't say if you have a gauge on the kart or not, if so don't use the CHT lead for temps, use an EGT screwed into on of the holes in the top of the head on either side of the spark plug. This will help the spark plug stay lower and also give a better reading of the temp (if there is such a thing).
And, as Jean touched on earlier, the most important things to take care and worry about on these little engines is the carb....Clean it, Clean it and then clean it some more.
Also, being that you have to use the restrictor pill, you may find that the original air filter with just one foam element may provide better power over the high flowing K&N in your situation with either a 56 or 57 jet.
Ron
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patrick slattery
Joined: 23 Apr 2004
Posts: 787
Location: United States, Ohio, cleves
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| Posted: Mon Apr 30, 2012 7:50 am Post subject: |
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| Ron Gordon wrote: | JT,
Also, being that you have to use the restrictor pill, you may find that the original air filter with just one foam element may provide better power over the high flowing K&N in your situation with either a 56 or 57 jet.
Ron |
Ron I have found much better power on my dyno with the high flow air filter, especially in the higher RPM range, but you do have to retune. If you just bolt it on expecting better performance, it will be worse.
Pat |
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Stewart Willis
Joined: 24 Oct 2008
Posts: 367
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| Posted: Tue May 15, 2012 7:01 am Post subject: |
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| CJ6y Gapped at 38, PERIOD. |
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M Jacob Hansen
Joined: 11 Aug 2011
Posts: 19
Location: United States, Utah, Grantsville
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| Posted: Tue May 15, 2012 11:07 am Post subject: |
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| Stewart Willis wrote: | | CJ6y Gapped at 38, PERIOD. |
.38 wow, never heard that size gapped before.
have you tried that gap on other plugs? what about a RCJ7Y?
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Jacob Hansen (Driver) --Kid Kart #89
Marc Hansen (Pit Crew) (Dad)
Cherry Hansen (Pit Crew) (Mom) |
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joe cento
Joined: 12 Sep 2006
Posts: 27
Location: United States, Missouri,
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| Posted: Thu Jun 21, 2012 11:15 am Post subject: |
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| M Jacob Hansen wrote: | | Stewart Willis wrote: | | CJ6y Gapped at 38, PERIOD. |
.38 wow, never heard that size gapped before.
have you tried that gap on other plugs? what about a RCJ7Y? |
That sounds like a huge gap to me also..i would run the NGK BR9EIX you could try the 10 also.but with all the blueprinted motors i build the 9 works well..good luck
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Joe Cento |
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Stewart Willis
Joined: 24 Oct 2008
Posts: 367
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| Posted: Sun Jul 08, 2012 10:18 pm Post subject: |
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| M Jacob Hansen wrote: | | Stewart Willis wrote: | | CJ6y Gapped at 38, PERIOD. |
.38 wow, never heard that size gapped before.
have you tried that gap on other plugs? what about a RCJ7Y? |
CJ6Y and Rcj7y are similar. The "R" means resistor. This is not a benefit to the engine. It cant help. But it may hurt. Its purpose is to prevent interference with electronics. The "y" represents the protruding electrode, which does two things: 1.) occupies airspace/increases compression 2.) puts the spark closer to the piston
the 6 is colder than the 7. I have tried every plug available, including some very expensive ones... the cj6y is the best through the useful RPM Range.. no question.
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Stewart Willis |
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Tysen Kendig
Joined: 11 Sep 2009
Posts: 1
Location: United States, Connecticut, Mansfield
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| Posted: Mon Oct 01, 2012 6:59 am Post subject: |
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| We've generally run E3 plugs, gapped between 34-38 depending on how much high-end is needed, for the past year and a half. Tested against the Champion and NGK plugs, and the E3 was consistently faster (.5 to 1 second per lap) with better high-end RPM. Tends to run hotter. |
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