DaveM

Aero Recip repaired this 470930-9018. Almost new with a new housing, bellows, springs. $800 Canadian peso's. Installed, seems to work like a charm. sea level T/O reported 17 gph with throttle set for 30" and 2700 rpm. Valve is set for 32.5". Interesting note is that the valve is good for 5" of dump. Means that if you run it to 37.5" of turbo output, it will hold the 32.5" manifold. If turbo output climbs above the 37.5", so will your manifold pressure. Don't think anyone wants to go there.

Anyone know what happened to M-20 Turbos, Bill Sandman? I doubt he made parts for this system. Must be someone out there somewhere that knows something. May be looking for a wastegate for this system.

Aero Recip out of Winnipeg, Manitoba, Canada got the okay from Hartzell to do the repair. Sent it off yesterday. Will let you know how it works out. Thanks for all the comments.

Tried them and hit a brick wall. They sent me to Aerorecip. Called Hartzell. support there had the drawing and the setting info but could not help after that. Stated it was proprietary and not PMA'd.

What time do you open? Just tried you folks and no answer.

So, I'm working the same issue on an M20J with the M-20 Turbo installed. Valve has failed. Pops at 45". 470930-9018 was what was installed. having no luck at all sourcing a repair of replacement. Hartzell support stated they have drawings for it and the setting is 32.25" +- 0.25 but that is all they'd give me. Tried all the usual folks and still no luck.

Just found found this from The Aviation Consumer dated 2001 The M-20 system, which sells for $23,389 for the kit plus another $2500 to $3500 for installation, is about as simple as turbocharging gets. It uses a Rayjay/Consolidated turbo with a fixed wastegate but no turbo controller. Boost is fixed at 30 inches, controlled entirely by a pressure relieve or pop-off valve on the outlet side of the turbocharger. (Lycoming developed a similar design for the Seminole and Comanche.) The designs chief advantage is simplicity; there are fewer parts to install and maintain and, especially, no turbo controller to fuss with.

Will comment here when I get it figured out.

Can't tell you that. Scares the crap out of us. Gauge ends at 30". If I use the graduations as a ballpark and the indicator is linear, then north of 35" Would have to ship it from Canada, so what did Advanced Turbo charge you? Aircraft Spruce Canada sells an overhauled unit for $633.00 Canadian Peso's

Correct

Can't tell you as we can't get full throttle because we hit the 30" limit, which gives us 15 gph approx

Thanks Appreciate the response. So, takeoff throttle position along with fuel flow and RPM will be limited to whatever you get at a sea level airport.. No short field takeoff's down here. Also, just checked the pop off valve per SB 592. Reads 46lbs for full open and pop off valve head is at 0.3215 instead of 0.20. May have a pop off valve issue as well. best rgds

Thanks for responding I'm a mechanic looking after this airplane. Its based at a sea level airport on the west coast of Canada. Takeoff from this airport, throttle is limited by the manifold pressure. Prior to getting to full throttle it hits 30" so turbo is putting out. Fuel flow is low due to throttle position. RPM is low due to throttle position. Stuffing the throttle all the way will overboost the engine. Have adjusted the fixed wastegate to lower boost at takeoff, which gets us full RPM and Fuel flow but then sea level manifold pressure ceiling is reduced. Overpressure valve is a 470930-9018. I have been unable to find the relief specs of this valve. Have sent an email to Quality Aircraft to see if they can tell be the spec. Again, everything I have read on this type of turbo system indicates it will be throttle limited at a sea level airport. Just trying to find out if this is the norm or does the system rely on the overboost valve to limit MP on takeoff.

Timing is good. Problem is, sea level airport, throttle in for takeoff, hit 30" before full throttle. Full throttle and manifold pressure goes off the clock. Gauge ends at 30 but the needle rolls well past this. Manifold pressure gauge reads normal at shutdown. Everything I have read so far indicates that a turbo normalized Lycoming with this type of fixed wastegate (bypass) will be throttle limited to 30" on takeoff at a sea level airport. Just trying to see what other experiences are.

Apologies if this has already been asked but can't find it. Anyone out there with an M20J Lycoming IO-360-A3B6D and the M-20 Turbo kit installed? If so, are you able to get full takeoff RPM without exceeding 30 inches manifold pressure at a sea level airport? The AFM just states Normal Takeoff (100% Power) 30"Hg MAP and 2700 RPM