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For Gman..Piston to Cylinder Wall Clearance

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Aaron

09-10-2002 13:24:02




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Gman, The pistons that i am putting in my B are i believe hastings and they are aluminum. My machinist wanted me to check before he went and bored it. So are you recomending that i go 10 thousanth or should i go more??

Thanks Aaron




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SEAMO

09-10-2002 20:13:02




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 Re: For Gman..Piston to Cylinder Wall Clearance in reply to Aaron, 09-10-2002 13:24:02  
Aaron, I have been involved in boring 2cyl Deere for 30 yrs. I hope the machinist that you have selected has bored Deeres before.They are a very hard block and have long cyl. Some of the older boring bars will chatter at the btm.If you dont dial bore gauge them I have seen them .002 -.005 small at the btm. The size of cyl overbore is always based on STD.bore of you engine plus the oversize. Your STD.bore should be 4.8125 plus your oversize .045. ==4.8575 finished bore. The skirt clearance is built into the piston. Most piston clearance is measured 90 deg. to piston pin.The pistons skirt are cam ground .010 to.015 smaller in the pin area depending on the manufacture. I have found the old M&W to have the most clearance and cam built into them. The new ones have less clearance and less cam . They are real close to the Clevite Spec. There are several import pistons out there that I no nothing about. What scares me the most we don't know what grade of aluminum they are or if they have been through the heat treat normalizing process. Question to you and your machinist.Your tractor is 50yrs old does it have a lime build up in the water jacket?? Clean it out.You should have a water pump and a perfectly clean radiator.Are you tractor pulling with the compression ratio raised above 6.5 to 1 You will have to increase the piston skirt clearance. I some times add .005 to the bore size. Bad part is for .001 increase in bore you will gain .003 in ring end gap.Good part is they have a lot of rings. Bad part is they are a little too wide for sealing high compression. on the 1/4 in. wide rings I usually run 2- 1/8in.rings in top groove if I can get them.You cant run the cyl wall finish the same as a car engine. To get the good ring seal hone them to the ring manufacture spec. If you are tractor pulling you will have to modify your carb to the fuel you are trying to burn.Stock carb will be too lean.Tell me bore, stroke, compression ratio, cranking comp. in pounds at wide open throttle.E-mail me I can help you with that.I have already taken up too much space I hope this clears it up for you. Earl

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