mhoksch Posted January 22, 2016 Report Posted January 22, 2016 I'm putting a KOSO EGT sensor on today. What is the optimal Egt temp? Where should I set my warning limits? If it matters, my setup is 10mm cub, shearer sb inframes, 35pwk, vp110 40:1 amsoil dominator Sent from my iPhone using Tapatalk Quote
trickedcarbine Posted January 22, 2016 Report Posted January 22, 2016 Depends where the bung is situated in the exhaust. Could be any where between 1,000-1,300. 1 Quote
sleeper06 Posted January 22, 2016 Report Posted January 22, 2016 Check directions but I'm pretty sure they want it 4" or so from piston and don't just jet on egt temp . Jet by plugs like normal then check egt . Get a set distance layed out then check egt just as it gets into the traps, 1100 seems to be a good number Quote
mhoksch Posted January 22, 2016 Author Report Posted January 22, 2016 I jetted on the dyno, just got this as a safety net after melting a piston. I race flat track so need wot for prolonged periods of time Sent from my iPhone using Tapatalk Quote
ClaudeMachining Posted January 22, 2016 Report Posted January 22, 2016 Check directions but I'm pretty sure they want it 4" or so from piston and don't just jet on egt temp . Jet by plugs like normal then check egt . Get a set distance layed out then check egt just as it gets into the traps, 1100 seems to be a good number ^^ This Melting point of aluminum is around 1250F ^^ and this But dont forget that no engine is the same. Mine go easy above 1200 without problem. Quote
ClaudeMachining Posted January 22, 2016 Report Posted January 22, 2016 buddy i speak to that ice races ovals shoots for a 1300-1400 egt range.... his motor has gone a GOOD FEW seasons without needing any rebuilds... and has saved his motor a hand full of times using the EGT sensors.... yup, that is bugging me. My engine do that too and i dont understand how... Alu melt at about 1250, i guess that the egt can be higher at the end of the exhaust vs the chamber??? I would like to have some explaination about that. Quote
camatv Posted January 22, 2016 Report Posted January 22, 2016 because you shouldnt be sitting at 1300 d if on gas for 100% of the time egt can show problems starting before they result in catastrophic fail. when i first started on the drag motors i shoot for 1100 on alky and can slow the bike some with less. lets me know i have a smidge of wiggle room if i need it. those were 350-400+ ft runs. i dont run one much anymore but last time i did for other reasons i noticed the motor was off side to side at lower rpm's i was able to make a needle change on that one side and even the temps out ( lectrons) Quote
mhoksch Posted January 22, 2016 Author Report Posted January 22, 2016 So would it work to set my temp warning around 1100f? I would like to err on the side of caution. Sent from my iPhone using Tapatalk 1 Quote
ClaudeMachining Posted January 23, 2016 Report Posted January 23, 2016 Ya i think thats the one, and i didnt see the numbers, i thought that was what he had mentioned it was set at 1400 flash, 1425 solid. could be wrong.....it was awhile ago.Nope, i remeber that too. 1 Quote
RagunCajun Posted January 23, 2016 Report Posted January 23, 2016 off topic but damn at 3:30 you went around all them easy. Looks like you just waited. Awesome video! Got a picture of the bike as it's set up in that video? Quote
trickedcarbine Posted January 23, 2016 Report Posted January 23, 2016 yup, that is bugging me. My engine do that too and i dont understand how... Alu melt at about 1250, i guess that the egt can be higher at the end of the exhaust vs the chamber??? I would like to have some explaination about that. The piston it self is heated by the burn and then quenched by fresh incoming ail/fuel mix from above and below while the piston cycles, so it never gets to the temp that the actual burned gasses reach. So the pyrometer on the SGT sensor reads the explosion temp and not the piston temp. Could probably be worded better, but that's the gist of it. 1 Quote
trickedcarbine Posted January 23, 2016 Report Posted January 23, 2016 off topic but damn at 3:30 you went around all them easy. Looks like you just waited. Awesome video! Got a picture of the bike as it's set up in that video?It's that White and Blue one TT Bansheerida posts. 1 Quote
camatv Posted January 24, 2016 Report Posted January 24, 2016 on alky been as high as 1250 but didnt notice much power increase i personally like stuff to last instead of exploded looking for that last .5hp i like to ride. 1 Quote
mhoksch Posted January 24, 2016 Author Report Posted January 24, 2016 Raced today with the new egt setup. It definitely helped with dialing in my jetting for the temp, but I also checked plugs quite often. I set my warning to come on at 1200f. My max temps during the races were around 1150f. I'm pretty sure I was still jetted a bit rich, but I'd rather be safe at this point. Plus I had no problem walking away from my class with the 10mm cub from Redline. Quote
trickedcarbine Posted January 25, 2016 Report Posted January 25, 2016 On oxygenated fuel, I'm changing mains every 10 degrees under 32*. Keep an eye on air temp and what the EGT's are. Keep a log. It will make tuning become second nature. Quote
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