wa55 3 hole can

jeff scott · Posted: Wed Aug 29, 2012 6:01 am Post subject: wa55 3 hole can

having trouble tuning these little things to get max performance. i have read to set high at 1/2 and low at 2 1/2. i have also read 3/4 and 2 1/4 read

can someone tell me what exhaust temp i should be aiming for?
thanks

Kent Metcalf · Posted: Wed Aug 29, 2012 7:43 am Post subject:

Jeff this is not a 100% right but in our Jr. kart our EGT is around 1050 to 1150 with the rpm's around 13800ish How is it running open like you say? Might load up some if he's not on it. Now we also are learning how to tune and was told the same thing. I have my high side just cracked open just a little because I'm told at some of these tracks Bryan will not use the high side much. You might not want to teach him how to tune it on the track at this point until later when he gets more experience, don't want him to stick the motor. But we start Bryan out on the low side at around 2 turns open and let him open it up as he gets going. I have found that with Bryans extra weight if we start it open at 2 1/2 its hard for him to get the jump on starts until it clears out. So we start out lean to keep it crisp and then open it. Be careful letting him adjust the carb just starting out. Good luck see ya soon. Hope this helps some.
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St. louis Mo.

jeff scott · Posted: Wed Aug 29, 2012 8:24 am Post subject:

i thought you guys were on the bigger carb and 4 hole can. we only turn 12000 max

JT Miles · Posted: Wed Aug 29, 2012 8:45 am Post subject:

Jeff,
You have a PM....
On the EGT... Call the engine builder to make sure where the carb should be set at first...
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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

Kent Metcalf · Posted: Thu Aug 30, 2012 10:01 pm Post subject:

sorry Jeff I forgot your got the small carb. My bad sorry
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St. louis Mo.

al nunley · Joined: 13 Nov 2006 Posts: 3038

The EGT works different from the CHT. You want to get it as high as possible. At some point, it will get a little lean, and you’ll get a little detonation and the EGT temp will go down. At this point you open the high speed needle just a little and run the engine just below that peak.
Same thing on the bottom, coming out of the tightest turn on the track. Be aware that the temps will be lower on the low speed, but the tuning is the same. If the temp is lower on lap 3 than it was on lap 2, open the low speed needle.
The temp will drop with detonation. It will also drop if you’re to rich, so if it goes down, first test for lean, then, if it goes down more, it means you’re rich.
Be aware that the maximum EGT will change with air density, so it’s always good to have an air density gauge handy.
It will also change with engine compression changes, so it’s good to have a “good” compression gauge. Check it often.
Fuel octane can have some effect.
It may sound a little complicated, and it does take some time to get it down, but it’s well worth the effort.
The important thing is that unlike the CHT, as long as the readings are going up, it means more power. There is no such thing as “too high of an EGT reading”
We ran the probe about 3.5” from the face of the piston, (not to important) with the tip of the probe in the center of the flow. (very important)
_________________
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