What is this component on a TSIO-360-FB? "Turbo Pressure Relief Valve"

Albertomannil

Hello friends,

I was looking at images of the TSIO-360 on this Engine and comparing to our engine, noticed it does not have this component. After some Googling, it appears as a Turbo Pressure Relief Valve. Is this the infamous Fixed Wastegate? Just trying to get to know this engine better, it was overhauled in 2018.

djspathis

The Turbo Pressure Relief Valve is a normally closed valve in the turbo boosted upper deck pressure plenum. If the upper deck pressure gets too high (above a set value like 43 inches of Hg), this valve opens to the ambient air which reduces the upper deck pressure. Consider it a relief valve that prevents unusual and abnormally high upper deck pressure.

-DJ

empannin

Also found on cars with Turbo's. If you are full throttle and then let off the gas quickly in a car the deck pressure will rise quickly (since the throttle plate is closed and the turbo has plenty of residual energy). Also sometimes called a blow off valve. Your goal in life is to make sure it never is used in your plane. It is the final protective measure to prevent overboost.

The fuel system is not designed to provide fuel at overboost MP's so not only are you trying to operate above rated power but the engine is going to start leaning out on you exactly when you don't want to be running lean...

The flip side of this is there is likely some "War emergency power" on tap if you really need it - as in life or death. Of course, the circumstances where this would make sense are few and far between.... In a twin at Vmc and not climbing after an engine failure adding power may very well be the last thing you do... Maybe if you had to out climb a rotor near a ridgeline? Why are you so close to a ridgeline that it would ever be a factor???

griff390

Eric asked;

"Why are you so close to a ridgeline that it would be a factor?"

Most likely because a non-aviation speaker was installed which caused immediate inverted flight. The accompanying lightning strikes and high altitude plasma events are very disorienting. Especially while inverted.

See what happens with non aviation parts? 🤣🤣

empannin

Jim, I am glad you brought that speaker up. Many plane owners suffer with poor audio quality in their speaker because they are not using low O2 Cu wire from Monster Cable. Normally it is $5 per inch but they have an aviation version design for high altitude for only $10 an inch.

The other use of the turbo blow off valve is intimidation. If the plane ahead of you is taking their own sweet time finishing their runup you can run the engine up to 44" and the blow off valve will open at 43". It will make a series of very loud pops as it opens and closes. Ok, maybe don't do this if you value your engine but you should be aware that it will sound almost like a shot gun blast if it opens up under pressure. ...

jacobsja

Geeze guys...

Everybody knows that the only reason to fly so close to a ridge line is: Because it is there, of course!

This is like asking how we got chicken nuggets: Because the chicken thought it could do formation flight in front of a jet.

Oh, and the perfect phrase to blast over that speaker system for making sure the ridge line surfing event gets all the attention that it is due: "Hey y'all, watch this!" Bonus points for live streaming it on social media. Double bonus points for live streaming what happens to a GA plane when lighting-off a JATO to try and save the day.

empannin

I like traveling with passengers as there are no cup holders. Then I can say "hold my beer and watch this!" ;)

Kidding of course! I would prefer not to fill out any paperwork...

Eric