normal egt reading

[scheffler]

Ok i did a quick serach no help

ok so I am reading 900*F on my egt at idle and I am assumeing that is High right? I have it about 1 1/2" away from the head on #4 runner.K type thermocuple

[480sx]

Dude, you dont need to worry about your idle EGTs. Your engine would shut off becuase there wasnt enough fuel to run it before it got to hot. Also, you should have put your EGT probe on the third cylinder, since thats the one that runs consistently leaner than the others.

Just make sure your boosted EGTs dont go much over 900C. Anything over 1000C, and your pistons start to melt, and things get messy. Each engine is slightly different, but again, google gasoline EGT tuning and you'll get some good stuff.

Also, thats not high at all. You dont have anything to worry about untill your over 1500-1600 f.
Modified by 480sx at 6:34 PM 9/27/2007

[WDRacing]

Actually, the number 4 is the correct spot. Since it's the hottest cylinder in the motor being the farthest from the radiator. The #3 rod always had issues because of a block or lube problem, not detonation.

Idle is definitly easy to tune, lean it out till it stutters, then add some fuel till it smoothes out. I had mine running at 15.7 AFR for quite some time. On as boost sets in, peak torque and full boost are the main spots to keep an eye on EGT's. It will most likely be the hottest at peak torque. Stay under 1000 for safety like suggested.

WD

[480sx]

Nope, number three runs hotter than four. Four has three sides exposed to air, and one side against another piston. Number three has only two sides exposed to air, and is in between two cylinders. Your part about it being the furthest away from the radiator plays a part in why three runs hotter than two.

Either way it wouldnt make a huge difference, im just splitting hairs. Its not like you should move your EGT probe, just FYI kinda stuff.

[neverlift]

IDK much about egt but I do recall 3 being the spot.....

[WDRacing]

I suppose...your logic definitly makes sense. I'm just going with experience, whenever I fried a plug or cracked a ring land it was the last cylinder.

But like you said...as far as readings go either will work. Keep her under 1K FTW.

[neverlift]

maybe its like this 3 gets hottest from lack of cooling but 4 dies from lack of fueling.?

w/ever you should start an egt tuning thread, I have looked into them somewhat and kinda held off...

[WDRacing]

I'm not really big into EGT unless I'm using seperate fuel types at the same time. For instance, using alcohol injection at the same time you're running 91 pump makes the AFR's inaccurate. So using a EGT gauge works very well in this instance since you can simply set a goal of a max EGT.

EGT's are also good for tuning the timing, since to much timing retard will increase the EGT quite a bit.

[neverlift]

more great info to the wealth of knowledge.

really that made great sense, the ideal afr for the two is way different. plus when adding to pump gas your only trying to handle detonation and maybe bring down temps both combustion and inlet. I should have got that autometer from highway*,damn.

[freakyjason]

When you are running rich, will your egt be higher or lower?

[scheffler]

I think it would be hotter if you are running lean, for the same reason why you detonate if you are running lean because the temps are hotter.

So a rich condition would run cooler.

I could be wrong though will someone verify this.

[480sx]

Your right.

Rich has a cooler combustion temp, lean is hotter.