lt1bird Posted June 11, 2009 Report Share Posted June 11, 2009 Ive been looking for some egt numbers to get me close. maybe someone can post them.... Idle= cruz= Wide open= 165 PSI compression 535 engine no real porting 110 race gas +4 timing Thanks! Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 13, 2009 Author Report Share Posted June 13, 2009 Did some reaserch and this is what i found 1100 at wot 1000 just before the pipe comes on higher rpm cruze 200 at idle well, mine is about 180 at idle, about 842 while 1/4 throttle cruzing at WOT ist 1000 Took it out on the hwy for a run and at wide open throttle it was about 950-1000 then as i roll off the throttle(1/2-3/4) I see the egt shoot up to 1290--1300.....guess what happens next? You guessed it.....just as I start to pull the clutch in I can feel it tighting up/seizing....still stalled but it was very very close.....Guess ill put richer needles in before I do that run again..... I dont think the needle clip postion will fix that problem whats your guess? since its happening right at 1/2-3/4 ill probably need a diffrent needle length....im running a cen.....Guess ill try a DGN as I have some... like my buddie pete says....If its go tits or wheels its gonna give you trouble" Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted June 13, 2009 Report Share Posted June 13, 2009 There isn't a spec for idle or midrange really. You just dont want to go over 1250 degrees, if you do, then its too lean. Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 13, 2009 Author Report Share Posted June 13, 2009 Im thinking that when I back off the throttle at high rpm from WOT the needle starts to block the main jet causing a lean condtion... A shorter needle will move that point down the rpm scale... I bet it will still be a bit lean when rolling off the throttle. Only fix i see is a much larger main jet.......even though my main jet is a bit rich right now..... Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted June 13, 2009 Report Share Posted June 13, 2009 What carb and needle are you running? Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 13, 2009 Author Report Share Posted June 13, 2009 What carb and needle are you running? 38mm keihn, CEN at 2nd clip from top... thinking the DGN might help as its richer in the 1/4 to 3/4 throttle range.... Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted June 13, 2009 Report Share Posted June 13, 2009 38mm keihn, CEN at 2nd clip from top... thinking the DGN might help as its richer in the 1/4 to 3/4 throttle range.... Two carbs, or one carb setup? Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 14, 2009 Author Report Share Posted June 14, 2009 Two carbs, or one carb setup? Two carbs.... Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted June 14, 2009 Report Share Posted June 14, 2009 Whats done to the motor? Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 14, 2009 Author Report Share Posted June 14, 2009 (edited) 165 PSI compression 535 engine no real porting 110 race gas +4 timing 38mm carbs trinity cyl's with power valves forged weisco Edited June 14, 2009 by lt1bird Quote Link to comment Share on other sites More sharing options...
moneybags Posted June 14, 2009 Report Share Posted June 14, 2009 (edited) Aluminum melts an 1250. It's going to depend on how far the EGT prob is from the face of the pistion. You might aswell try raising the needle befor you go out and buy new ones. There is no point in wasting money if you dont need to... JMO Edited June 14, 2009 by moneybags Quote Link to comment Share on other sites More sharing options...
lt1bird Posted June 14, 2009 Author Report Share Posted June 14, 2009 (edited) I already have tons of needles.......I think a few things led to this happening..... I went to a much smaller main jet.... from 148 to 142...(trying to get the egt at WOT to 1100f.... the needle clip position is in the leaner second clip position... changing the clip position might help but I think it would simply move the lean condition down the throttle position more.....I think the correct fix is to use a richer needle and move the clip postion and maybe go back up a bit on the main jetting. Around town I never saw any issue at all....all my wot runs were perfect....all my midrange runs etc all looked great...I felt I was done tuning.... around town i never really roll off the throttle from WOT as I do not have enough room to do that...... I figured I would hit the hwy to see if the constant cruzing at speed was good.....it looked just fine..... at 1/2 throttle.... but a sustanded higher rpms must have heated the EGT up too much so when I backed off the throttle to 3/4 throttle it was just enough to make it over heat... I think im lucky I pulled the clutch in so quick...as I could feel it just starting to do it.... ill put a bore scope down the plug hole to check the cyl... does this happen to others here?? Edited June 14, 2009 by lt1bird Quote Link to comment Share on other sites More sharing options...
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