Original Posted By: Tim Willis
Hi Guys,Well I had a good weekend this time. I have just completed the rebuild ofthe Corvair after it spun a bearing due to high oil temps.I have installed a new (10/10) nitrided, balanced crank, balanced rods andall new seals etc. I even installed new lifters rather than drain theexisting ones. According to my engine shop mechanic the wrist pins werenearly seizing in the pistons due to the heat. The near seizure of No 5wrist pin caused the con rod big end bearing to slip, hence the rather loudnoises coming from the engine. His thoughts were that the wrist pin wasn'tgetting enough oil so he drilled two holes in each piston so that the oilhad a better path to the bearing service. (Seehttp://www.cpc-world.com/new_card_images/images/Piston.jpg). It certainlyseems to have worked.The engine ground runs showed the oil temp and cht were all normal and thepressure was good. I have a slight oil leak from the rear case I think and Iwill get that sorted in the next day or so.I went for a quick flight to see if all was well and, apart from thelanding, everything was great. Seems I know have a Pietenpol that I can flywithout having to worry about high temps.Chewing the cud with one of our local crop duster pilots later in the day, Isuggested that he take the Piet for a fly and see if the landings are mylack of ability or something to do with the undercarriage geometry.A quick explanation of the cockpit layout and after levering the guy in theseat (he's bigger than me) off he went. An hour later and nearly dark, backhe comes with a big grin over his face. Seems like the Piet is fine and Ihave to do some more landing practice. A very good feeling indeed.I'm still grinning.CheersPeterWonthaggi Australiahttp://www.cpc-world.com5:00 PM________________________________________________________________________________Date: Sun, 26 Aug 2007 17:38:10 -0500 (GMT-05:00)
Pietenpol-List: A Good Weekend.
> Pietenpol-List: A Good Weekend.
Original Posted By: del magsam
RE: Pietenpol-List: A Good Weekend.
Original Posted By: owner-pietenpol-list-server(at)matronics.com
Tim,Thanks, nice to know they are being used.CheersPeter.Wonthaggi Australiahttp://www.cpc-world.com-----Original Message-----
Tim,Thanks, nice to know they are being used.CheersPeter.Wonthaggi Australiahttp://www.cpc-world.com-----Original Message-----
RE: Pietenpol-List: A Good Weekend.
Original Posted By: owner-pietenpol-list-server(at)matronics.com
Del,I never had any problem with the oil pressures, even at tick over. Certainlyhigh oil temps and moderately high CHT were the norm. The pressure now onstart up can go to 60psi and then drop back to the 40s when running. It cameback to around 20 psi at idle after an hour flight yesterday.According to my engine shop the excessively tight wrist pin caused the smallend bearing to slip. The high oil temps were the product of tight wristpins.CheersPeter.Wonthaggi AustraliaHYPERLINK "http://www.cpc-world.com/"http://www.cpc-world.com _____
Del,I never had any problem with the oil pressures, even at tick over. Certainlyhigh oil temps and moderately high CHT were the norm. The pressure now onstart up can go to 60psi and then drop back to the 40s when running. It cameback to around 20 psi at idle after an hour flight yesterday.According to my engine shop the excessively tight wrist pin caused the smallend bearing to slip. The high oil temps were the product of tight wristpins.CheersPeter.Wonthaggi AustraliaHYPERLINK "http://www.cpc-world.com/"http://www.cpc-world.com _____
RE: Pietenpol-List: A Good Weekend.
Original Posted By: owner-pietenpol-list-server(at)matronics.com
Shad,Oil temps are around 220F on a 70F day. The probe is mounted in the normalCorvair place on the oil filter adapter housing. According to WW this putsit just before the oil cooler.CheersPeter.Wonthaggi AustraliaHYPERLINK "http://www.cpc-world.com/"http://www.cpc-world.com _____
Shad,Oil temps are around 220F on a 70F day. The probe is mounted in the normalCorvair place on the oil filter adapter housing. According to WW this putsit just before the oil cooler.CheersPeter.Wonthaggi AustraliaHYPERLINK "http://www.cpc-world.com/"http://www.cpc-world.com _____
Re: Pietenpol-List: A Good Weekend.
Original Posted By: "walt evans"