Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Tractor Pulling Discussion Forum

JD A piston clearance ?

Welcome Guest, Log in or Register
Author 
pulls other bra

05-25-2007 10:43:54




Report to Moderator

I know very little about 2 cyl pullers and less about airplanes.A friend is building a 6.125 or 6.250 stroker with airpl;ane pistons.Varios builders haved quoted clearances all above ....020 This seems alittle excessive even for a forged piston.I know of a similar A that was 5.75 @ .021 that thing hammered worse than a 730 diesel which by the way is .016 .Any knowledgable info would be appreciated.Thanks.

[Log in to Reply]   [No Email]
skip 33652

05-25-2007 18:41:53




Report to Moderator
 Re: JD A piston clearance ? in reply to pulls other brands, 05-25-2007 10:43:54  
those radial aircraft engines used lots upon lots of clearance .025 + is normal the reason for this was the air cooled cylinders grew and shrank alot. one instance is high leval flight retard throttles and dive to lower altitude then fire wall engines and hope they ran and didn't seize up. these engines were built for war use not pleasure flying and longlivity and oil consumption was not a big issue.if you use .002" per inch of bore and add a thousands or two you should be fine. Paul

[Log in to Reply]  [No Email]
ToddF

05-25-2007 13:32:39




Report to Moderator
 Re: JD A piston clearance ? in reply to pulls other brands, 05-25-2007 10:43:54  
I used 6.123" diameter Pratt and Whitney aircraft pistons in my JD70. Apparently the rule of thumb for aluminum pistons in cast iron is .002" clearance per inch of bore diameter. So... 6.123" x .002" = .0122" of clearance, I used .014" clearance just to be safe and she still is running fine, that was six years ago.



[Log in to Reply]  [No Email]
Drew

05-25-2007 10:58:31




Report to Moderator
 Re: JD A piston clearance ? in reply to pulls other brands, 05-25-2007 10:43:54  
You are probably talking about the 6.125" bore Curtis Wright airplane pistons. I think mine measured 6.101" 90* to the wrist pin. In my opinion that is too much clearence built on for a 6.125" bore. On the blocks I have bored to use these pistins I usually try to hone to a finish bore of about 6.117". If you do this, you need to check your ring gaps and file them if necessary because you close the ring gap about .003" for every .001" you shrink the bore.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy