Not so sure about that I think that there are some store bought aircraft that use a fixed aperture. I believe the early Piper Seneca IIs did. It;s been quite a while but my rapidly fading memory indicates that. A waste gate is certainly more efficient whether manual or automatically actuated. Rich In a message dated 5/7/2020 5:15:13 PM Central Standard Time, flyrotary@lancaironline.net writes: You need a wastegate on your exhaust side to regulate the amount of boost. Without it, you could overboost and create detonation A pressure relief valve is used to prevent overpressuring the intake side if you slam the throttle shut. It does not regulate the amount of boost. If you are always careful to close your throttle slowly, you may not need a pressure relief valve, but you should always have a wastegate. See the links below for more info. https://www.onallcylinders.com/2017/01/19/wastegates-vs-blow-off-valves-whats-the-difference/ https://grassrootsparts.com/blogs/technical/blow-off-valve-vs-wastegate https://www.hotrod.com/articles/spotters-guides-wastegates-and-blow-off-valves/ Bob Rogers From: Rotary motors in aircraft <flyrotary@lancaironline.net> Sent: Thursday, May 07, 2020 4:47 PMTo: Rotary motors in aircraft <flyrotary@lancaironline.net>Subject: [EXTERNAL MESSAGE] [FlyRotary] Turbos Can anyone help me with the following? With a turbo, can I just use a pressure relief valve and negate the wastegate totally?? Looking for simplicity and weight saving. Neil.
You need a wastegate on your exhaust side to regulate the amount of boost. Without it, you could overboost and create detonation A pressure relief valve is used to prevent overpressuring the intake side if you slam the throttle shut. It does not regulate the amount of boost. If you are always careful to close your throttle slowly, you may not need a pressure relief valve, but you should always have a wastegate. See the links below for more info. https://www.onallcylinders.com/2017/01/19/wastegates-vs-blow-off-valves-whats-the-difference/ https://grassrootsparts.com/blogs/technical/blow-off-valve-vs-wastegate https://www.hotrod.com/articles/spotters-guides-wastegates-and-blow-off-valves/ Bob Rogers From: Rotary motors in aircraft <flyrotary@lancaironline.net> Sent: Thursday, May 07, 2020 4:47 PMTo: Rotary motors in aircraft <flyrotary@lancaironline.net>Subject: [EXTERNAL MESSAGE] [FlyRotary] Turbos Can anyone help me with the following? With a turbo, can I just use a pressure relief valve and negate the wastegate totally?? Looking for simplicity and weight saving. Neil.
You need a wastegate on your exhaust side to regulate the amount of boost. Without it, you could overboost and create detonation A pressure relief valve is used to prevent overpressuring the intake side if you slam the throttle shut. It does not regulate the amount of boost. If you are always careful to close your throttle slowly, you may not need a pressure relief valve, but you should always have a wastegate. See the links below for more info.
https://www.onallcylinders.com/2017/01/19/wastegates-vs-blow-off-valves-whats-the-difference/
https://grassrootsparts.com/blogs/technical/blow-off-valve-vs-wastegate
https://www.hotrod.com/articles/spotters-guides-wastegates-and-blow-off-valves/
Bob Rogers
From: Rotary motors in aircraft <flyrotary@lancaironline.net> Sent: Thursday, May 07, 2020 4:47 PMTo: Rotary motors in aircraft <flyrotary@lancaironline.net>Subject: [EXTERNAL MESSAGE] [FlyRotary] Turbos
Can anyone help me with the following? With a turbo, can I just use a pressure relief valve and negate the wastegate totally?? Looking for simplicity and weight saving. Neil.