Brodhead Pietenpol Association

Original Posted By: mboynton(at)excite.com
Subject: Pietenpol-List: A Engine SpecsPieters,Found this in some of my father's old files. Thought maybe someone might use some of this info. If you know it just disregardClearance Limits for assembly of "A" Engines.(Ford service bulletin, June 1931) All dimensions in inches.Piston in cylinders-- .002 maximumPiston ring gap, lower ring-- .008 to .010Piston ring gap, centerring-- .010 to .012Piston ring gap, upper ring-- .012 to .015Ring groove clearance-- .001Piston pin fit in connecting rod bushing--- .0003 maxPin in piston-- .0002 to .0005 shrink fitPistons assembled with split side toward left side of engine.Connecting rod side play on crankshaft-- .008 to .012Connecting rod clearance between piston bosses-- .040 to .053Connecting rod clearance on crankshaft diameter-- .001Connecting rods assembled with oil dips toward camshaftCrankshaft end play-- .002 to .004Main bearing clearance-- .001Camshaft bearing clearance --.003 maxCamshaft end play taken upby tention of spring in front cover. Spring tension 35 lbsValves to push rods clearance-- .010 to .013Exhaust valves in valve guides -- .002Intake valves in valve guides -- .001 to .0015Valve lift -- .287Push rod clearance --.0015Timing gear backlash -- .004End play of water pump shaft -- .006 to .010Spark plug gap -- .035Hope this might help someone.Corky in ole ford country________________________________________________________________________________Date: Thu, 12 Apr 2001 08:24:50 -0700 (PDT)

Original Posted By: Isablcorky(at)aol.com
Subject: Re: Pietenpol-List: A Engine SpecsIn a message dated 04/09/2001 5:27:33 PM Central Daylight Time, Isablcorky(at)aol.com writes:> Thanx Corky....now , would your fathers old files ( or any of the listers files) reveal what the orifice or jet sizes are for the Model A (or peferably the Model B, if different) Zenith carburetors ? I think I have narrowed down my overly rich condition to aftermarket jets that are too large but can't find info anywhere on what they should be. Don Hicks in Alabama________________________________________________________________________________

Original Posted By: "walter evans"
Subject: Re: Pietenpol-List: A Engine SpecsSorry,Don't have that information but I'll check with Chuck Henley, an A owner and specialist here in Shreveport, as soon as he gets home from church.Corky________________________________________________________________________________

Original Posted By: Isablcorky(at)aol.com
Subject: Re: Pietenpol-List: A Engine SpecsIn a message dated 4/15/01 7:25:26 AM Pacific Daylight Time, DonanClara(at)aol.com writes:> Thanx Corky....now , would your fathers old files ( or any of the listers > files) reveal what the orifice or jet sizes are for the Model A (or > peferably > the Model B, if different) Zenith carburetors ? I think I have narrowed > down my overly rich condition to aftermarket jets that are too large but > can't find info anywhere on what they should be. Don Hicks in Alabama> > > Don,I have an extra model B carb at the airport. I will will measure the jet orifices and post the numbers. I have two B carbs on planes and haven't had an over rich condition. I use about 1/2 to 3/4 turn open on the main jet adjustment and safety it there. The venturi on this extra carb is smaller than the other two and when I flew the plane with this venturi it did not have as much power (of course), but I didnt't have a mixture problem. The after market B carbs are also good, But float and needle jet parts have to be adapted as paarts are not available. Doug Bryant Wichita Ks________________________________________________________________________________

Original Posted By: DonanClara(at)aol.com
Subject: Re: Pietenpol-List: A Engine SpecsTo Don Hicks,Chuck Henley says:An "A" Zenith has 5 jetsListed will be the type jet, drill size and decimal equivalent.Idle Jet 0 to 3K #75 .021 Jet Flow 30 sec 22to24 cc 3 to 5K #75 .021 5 + #76 .020Compensator Jet 0 to 3K #65 .035 Jet Flow 30 sec 69to71 cc 3 to 5K #65 .035 5 + #66 .033 Cap Jet 0 to 3K #63 .037 Jet Flow 30 sec 80 to 83 cc 3 to 5K #64 .036 5K + #65 .035 Main Jet 0 to 3K #63 .037 Jet Flow 30 sec 70 to 75 cc 3 to 5K # 64 .036 5K + #65 .035 Secondary Well 0 to 3K #70 .028 #54 .055 3 to 5K #70 .028 #54 .055 5K + #70 .028 #54 .055For Altitudes above 5K Flow should be 14% less than above chartTo change jet sizes, use solder and drill proper sizeYou may buy a video on zenith carbs from Snyder's 1 888 262 5712. Chuck says it will answer ALL questions. He did say that if he could help any of our A model Pieters call him at: Chuck Henley 318 686 3088 a GREAT guy. Hope this answers your question;Corky in A model country________________________________________________________________________________

Original Posted By: "Mckellars"
Subject: Re: Pietenpol-List: A Engine SpecsThank you Chuck and thanks also to Doug Bryant for your great answers to my inquiry. Both will be a BIG help and may also be helpful to others with Model A engines. When they're over 70 years old it's hard to get parts or specs. Just shows how valuable this discussion group is. Don Hicks ________________________________________________________________________________