hot hot
 

Reason why dino-oil is not recomended in turbocharged cars:

http://www.saabnet.com/tsn/photo/0202.jpg

In my early aviation days, I flew a C421 across the Sierra Nevada's every night round trip from Oakland to Phoenix. The best way to set the mixture at top of climb was to lean until the entire exhaust system glowed cherry red. It was visible thru the cooling louvers on the top of the cowling. You could see every weld, every clamp, every gasket, every oily (cool) spot on the tubing.

Looked a lot like that pic.

Nice!

is that from a vw?
my friend's scirroco had his turbo turn that color after some 'spirited' driving

except for the egt and head-temp gauges, they were taped over! :D

Seeing the turbo that color makes a great point for a huge intercooler -- that intake charge just might be warm.

JP

Actually, intake charge has nothing to do with EGT and turbine-housing temp but is directly proportional to boost pressure and compressor efficiency...
With other words, intake charge is compressed on the cold side of turbo.

Engine is old school SAAB 900 Turbo on engine dyno...doing 80 hrs stress run or something.

Looks pretty impressive, but completely normal for a hard working motor....especially if it's sitting in a test cell with little air circulation.

I need to find some images I have of 24 cyl turbo-diesel generating sets under full load. The snail shells are glowing like the sun!

C'mon, beep. The intake temperature of the charge is not at all affected by the glowing red hot side of the exhaust side? What kind of thermal insulation are they running between the housings?

JP

Well, of course there is going to be some thermal transfer going on between impeller and compressor but it's quite marginal compared to heating done by compressing air itself and compressor inefficiency. There is oil- and watercooled (on newer turbos) bearing housing in between that moderates the heat.

OK. I been edjumacated. :D
Learn something new every day here.

JP