High EGT?

[AVanlent]

I have a Kitfox 2 with a 582 Grey head. 66" GSC prop (not adjustable), with a B gearbox. Ever since i have owned the plane, i have had high exhaust gas temps. I have the carbs set at full rich, and the main jet is 165. My rpm doesn't exceed 6,800, but no matter if I'm at full power or at cruise, my EGT gets up to 12. Also, my plane only flies at 55-65mph indicated. Is this telling me that i am not loading the engine enough and i need a new prop?
Any other information that may be needed i can get! I appreciate the input!

[SkyPirate]

2 blade or 3,..you should get closer to 75-80 pitch should be around 11 to 13 degree's the 582 will have between 4500 and 5000 rpm a "hot spot" I tried to stay out of that range with my 582,...if your getting those temps through out the RPM range it might be your sender or gauge,..what are the CHT readings after it's reached 1200 EGT?

[AVanlent]

I don't have a CHT gauge. So I'm not positive. I only have the water temp and EGT. My prop is a 3 blade, and i believe its fixed at about 9 or 10 degrees. Generally i cruise at 5500-5800 rpm and the EGT doesn't change. If i pitch up, and add some power to load the motor, i can get the EGT down momentarily, but it goes right back up when i level back out

[SkyPirate]

your pitch should be more between 11 and 13,..mine ran around 1050 EGT 350 CHT water temp at 175/180 depending on outside air,..my elevation was 450 at field,..I stayed below 5000,..what is your static RPM ?

[Danzer1]

The 1st thing I would check is the gear ratio in your B box - the B was available in a 2, 2.24 and 2.58. If the 582 came out of a different application, you might have an inappropriate ratio to start with for your prop.

How many hours on the engine total? and/or since last overhaul? Any upgrades/mods? All service bulletins done?

I would also check to see if rpm is reading accurately and find a way to read (at least temporarily) egt and cht from each cylinder (you need to be able to compare them) and also be able to read the coinciding coolant temp.

I thought the older 582's were rated for 6400 max. 5 min and 6000 continuous? I'd probably check that too, with Lockwood based on your serial number. They may also be able to tell you who originally bought it and for what application and if it has been overhauled (unless of course you already know the history).

Greg

[AVanlent]

Thanks Greg! its a 2.58 ratio. The total time is 240 hours. And it was built in Ohio, and sold to the guy that i bought it from. But from everything i have redone on the plane, the original builder didn't do a very good job with much! So i wouldn't be surprised if he just threw some stuff on there that wasn't exactly right, such as the prop. Mine and my buddies are the same year, and they both redline at 6800rpm. Which is right where I'm at.

[AVanlent]

I cleaned the carbs, but the guy that i bought it from flew the plane around for a couple years, but stayed close to his home airport in Kentucky. It runs fine, just doesn't have the performance it should, and the egt problem. The fastest it has ever gone since i have had it was 65, and that was with my friend flying it who is a more experienced pilot. Everything to me is pointing to the prop, but i want to make sure before i make the 800-1000$ investment

[Av8r3400]

#1 Question - What kind of tachometer are you using?

Analog tachs are notoriously inaccurate on 582s. Get yourself a tiny-tach to verify you are getting the RPMs you need.

[AVanlent]

When i ground tested everything, it ran up to 6500rpm i believe. Water Temp stays well within range.

[SkyPirate]

6500 is about right,.. but your cruise should be higher,..your water temp won't respond quick enough if your EGT's climb rapidly,..even the CHT wouldn't if you had one,,but prolonged higher EGT would raise the CHT,. have you got the EGT on front or rear cylinder? have you got the carb needles set on the same notch front and rear?