582 high engine temp

by Michael Regan in 2 Stroke Technical Questions 11 years ago

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Re: 582 high engine temp

by Michael Regan » 11 years ago

Michael Regan

5 96 0

Not really Bill. About the same. I did seem to get a little more height before redlining temp, but its hard to say because it was a little cooler OAT last night when I tested it. BTW... made another mistake on the rad size. The area is 45 sq inches (not 54 like posted before) so only a tad bigger than the ROTAX ones.

I will probably have to tolerate it and climb in stages rather than one non-stop climb to say 4000', because it cruises fine in normal temp range.

Mike

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Re: 582 high engine temp

by bill martin » 11 years ago

bill martin

10 757 0

Mike,

The only other thing I can think of is to reduce the prop pitch and get the WOT rpm back up to where it should be. This will allow the engine to develop its full horsepower so it won't have to work so hard at full throttle. Probably just one or two degrees should do it.

Bill.

Thank you said by: Michael Regan

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Re: 582 high engine temp

by Michael Regan » 11 years ago

Michael Regan

5 96 0

Bill... can the pitch change on its own? The reason I ask is because the problem first began a fair while ago...and then it seemed to fix itself (all I did was the normal fuel maintenance like change filters and diaphragms in the fuel pump and replace some common carby parts) for a few months and then re-appeared recently again. The overheating and the loss of 700rpm problems both seem to go together. When one comes the other comes at the same time. I am almost sure of this but not positive. When the engine was 100% I never ever noticed overheating even to 5000 feet and the little Avid climbed like a rocket (12-1500 FPM), but when the rpm drop manifested so too did the overheating and climb rate dropped to 800 FPM.

I confess I am a newbie to engines as until a few years ago always hired aircraft, and so had no real need to learn, but now I am learning plenty simply by listening to you guys all pitching in. From what I have seen so far, I have decided I will not do anymore investigations until I get that darn "Y" exhaust bit off and take a geek first hand at the rings and pistons. If that proves to be good news, then I will begin investigating the prop.

Thanks to all... Mike

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Re: 582 high engine temp

by Ian Jones » 11 years ago

Ian Jones

2 53 0

It seems to me Michael that you have eliminated all possibilities except the radiator capacity to cool the engine. I would be investigating ways to increase the radiator area, although I realise that may be a little difficult inside the cowl. This will give you more coolant, and of course more cooling area.

Pud

Thank you said by: Michael Regan

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Re: 582 high engine temp

by bill martin » 11 years ago

bill martin

10 757 0

Mike,

The pitch almost never changes on its own. I've never seen that happen. You have checked everything that would normally cause this problem. Rads are of sufficient size and are clean, water pump is OK, compression is acceptable, and piston tops and cylinder walls look OK. I would go ahead and inspect the rings through the exhaust, but based on your compression check and scope inspection findings, I suspect you are unlikely to find a problem other than normal wear.

I'm gonna clutch at straws again here. Are the EGTs good at WOT. Sometimes a weak fuel pump won't supply enough fuel get the engine to its top RPM. This usually results in a lean mix, reduced RPMs, and high EGTs at WOT. Are the EGTs normal at WOT? They should be somewhat higher but not abnormally higher. Is the fuel filter clean? You can get the same problem there. If you have a strainer in the fuel tank, it could be partially clogged. Has fuel consumption gone up?
That engine gets its best fuel economy between 5000 and 6000 RPM. Have you notice any drop in RPMs necessary to maintain given cruise speed?

I think you are right in thinking that it is not a prop problem, but if all else check out OK, I would give a pitch change a try. Too much pitch can cause lower climb rates, cruise RPMs that are too low, and overheating. Too much pitch is kind of like trying to run a car at low speeds in high gear. It overworks and overheats the engine.

Hell, at this point I'm willing to try waxing the the windshield. I'm sure you are too.

Bill.

Thank you said by: Michael Regan

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