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

Shop Now

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

Tractor Talk Discussion Forum

Compression Question

Welcome Guest, Log in or Register
Author 
JKC

02-01-2004 08:37:27




Report to Moderator

This is probably a gross over-simplification of this question, but here goes: If an antique tractor starts rather easily after sitting for a couple weeks or so (pops right off), does that mean that one can assume it has good compression? I look forward to any responses. Thank you.




[Log in to Reply]   [No Email]
i r baboon

02-01-2004 19:44:19




Report to Moderator
 Re: Compression Question in reply to JKC, 02-01-2004 08:37:27  
if its gas tractor, be sure throttle is wide open for compression test, run it till warm, first. be blessed



[Log in to Reply]  [No Email]
kyhayman

02-01-2004 16:32:50




Report to Moderator
 Re: Compression Question in reply to JKC, 02-01-2004 08:37:27  
I bought a 1410 David Borwn a few years ago. It started great, ran strong, had power to spare. In a hard pull it also had a LOT of blowby, couldnt even see the front of the hood. Othwise almost non existant. I tore the engine down and had the block checked at a machine shop, walls were scored so bad that it had to be cut 20 thousandths, crank was wasted. Had to do a 30 thousandths turn and still had shadows (any DB experts are going to say you cant turn these 30, found that out AFTER I did it). With the walls in that shape it couldnt have had much compression.

[Log in to Reply]  [No Email]
RJ Miller

02-01-2004 14:23:32




Report to Moderator
 Re: Compression Question in reply to JKC, 02-01-2004 08:37:27  
It makes no sense to judge the power or performance of an engine by how easily it starts. The only real way is to take comprssion readings and compare the difference to each cylinder, also know as a percentage of drop. Rule of thumb is anything over 125psi for gas with a varience of 22psi to the weakest cylinder...Does that help?



[Log in to Reply]  [No Email]
Scottf

02-02-2004 07:06:34




Report to Moderator
 Re: Re: Compression Question in reply to RJ Miller, 02-01-2004 14:23:32  
Maybe you were thinking of a gas engine. Judging the compression of a Diesel engine based on how it starts at different temperatures is fairly easy and quit accurate with a little experience. There is a direct relation to how well a diesel engine starts and compression. Obviously, since a diesel engine uses compression to ignite the fuel. And heat. Of course, if it does not start well it there could be something else wrong. But a diesel will not pop off cold with low compression. So you can tell, by the way a Diesel engine starts if the compression is good but necessarily if it is bad.

[Log in to Reply]  [No Email]
raytasch

02-01-2004 08:53:24




Report to Moderator
 Re: Compression Question in reply to JKC, 02-01-2004 08:37:27  
'Good' being what it is, my comment would be yes. It may not measure perfect as some would like to see but if it starts easy and has good power it is probably at least decent. Caution, an engine can have good compression and still be worn. It could have one or more cylinders down on compression and still start quickly on the strong cylinders. jmho,
ray



[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