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I never did turbo anything. NA engines are run a bit rich for best power, about 12.7 FA ratio. Which is about 1600 degrees. For aircraft I think a killer ignition system and well lean of peak EGT would also produce lower temps, just from lack of fuel. EGT probes vanishing does indicate too high an EGT.
Lynn E. Hanover
In a message dated 12/4/2018 3:59:17 PM Eastern Standard Time, flyrotary@lancaironline.net writes:
Hi Neil, I'm about like you; I know very little about turbos. But I am from Mississippi USA, and I can usually tell future fertilizer when I step in it. After reading some of the answers you got 'elsewhere', I felt like it was half way up my pants legs. That's the reason for my earlier post. I like the price of that diesel turbo, but I'd have the same question as you about heat tolerance. I have no idea about the temps of diesel exhaust; anyone know about that? I also heard an idea, from someone I trust, about a way to somewhat reduce the turbine inlet temps, with some side benefits. He sometimes reads stuff here; maybe he'll jump in since I'm not qualified to even summarize it. Charlie On 12/4/2018 1:29 PM, Neil Unger 12348ung@gmail.com wrote:
Ok, interesting stuff, but how do you keep the exhaust temp below 1600 degrees without losing a lot of power? I no longer have an EGT as it just worried me with 1800 degrees and the cost of burnt off egt probes. From memory 1600 degrees goes out the window at about 6000 rpm or less?
Neil.
Hi Andrew, I know next to nothing about turbo technology so have stayed clear of them; IIRC this is the first time I’ve heard of using a turbo from the agricultural industry and advice to stay clear of the automotive type ... seems to make sense – tractors use turbos that last for decades.
Jeff (13B, RD1-C, 144 hrs)
From:
Sent: December-03-18 5:14 AM
Subject: Re: [FlyRotary] Re: Hey Neil,
Neil, Type Turbo selection Into search of flyrotary archives, you’ll get about 30 posts from 2002 to 13 that are worth reading, other searches will give more.
Basically you want something the size of a T04 60-1, keep the A/R >1, something like 1.15 or 1.30
T04’s are plentiful from all the older diesels like 2wd tractors from last century. you probably got a few parked up around you that will still be servicable. If you can find one without a intercooler on it, chances are that it might have the right compressor. Otherwise they are easy to change.
Steer clear of automotive turbo’s, they will overspeed at altitude & disintegrate, need waste gates & blow off valves. Stuff thats not required on an aeroplane.
When installing. Put a normally open solonoid valve in the oil supply line. Allows you to close the oil supply if the turbo blows its seal.
Always bugged me why turbo shops charge so much for such a simple part.
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