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Thanks Todd, I am expecting my turbo back early next week, so will see if I can destroy it as usual. Neil. From: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wednesday, May 20, 2020 6:12 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: porting Hi Neil; I'm not sure the exact size of the wastegate. What I did was; I took out the 2 bolts that hold the end of the turbine housing (plus the 3 from the exhaust pipe of course) and that exposes the wastegate. With it closed I sprayed it with ink (or paint whatever you have on hand) then remove the wastegate and finish disassembly of the turbine housing. I then took a die grinder with a rotary file bit and carefully removed metal until there was 1/16" of metal until the paint line evenly all the way around. That is the new remaining seat. I then opened up the inside of the wastegate port to provide a large smooth flared entrance into the port. I switched from the rotary file to a flapper type of sanding wheel on the die grinder to polish it smooth for flow. That probably wasn't necessary. I've had no issues with boost creep. It took probably a little more than an hour of work. I read somewhere that you can replace that little flapper disk on the wastegate with a larger one, then you can really hog out that hole, but I haven't found that necessary. Todd or anyone, Just what size holes are required to grow the hole to in the Hitachi turbo?? Just getting mine returned from the bloke who has done nothing, then I can also enlarge the ports while here before I send off to another Turbo bloke who appears to know what he is doing. Neil.
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