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
 
Marketplace
Classified Ads
Photo Ads
Tractor Parts
Salvage

Community
Discussion Forums
Project Journals
Your Stories
Events Calendar
Hauling Schedule

Galleries
Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Articles
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs
Glossary

Miscellaneous
Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

  

Re: McChormick Deering 15-30 compression


[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]

Posted by spiffy1 on March 04, 2009 at 09:57:00 from (70.41.137.72):

In Reply to: McChormick Deering 15-30 compression posted by Ralph 1111 on March 03, 2009 at 20:00:04:


Norm43 said: (quoted from post at 09:58:13 03/04/09) if I can remember where I noted the 14.7 number I can figure all the others I have as well.


Yes & no. Oh boy am I going to create confusion, but here it goes:

The formula I gave earlier doesn't take into account either pressure increases due to temperature introduced by the compression, pressure losses due to the inability to utilize the full stroke (valve timing, lower vacuum at the top of intake stroke, etc), nor probably a half dozen different things I can't think of! :lol:

However, cranking it slowly enough on these low-compression [which reduces the temp rise effects too; think diesel: high compression ratio producing high temp rise] engines: some of the temp rise is lost to the cylinder walls (OTOH, I think you were planning to belt it) and I have to think the intake losses are increased: all in all making the pressure equation somewhat mute likely giving half the potential pressure, yet potentially not bad of an estimate if the "mechanical" effects may be assumed to roughly equally counter the temp rise effects.

And I'm still probably missing half the idiosyncracies that would give an equation relating compression ratio the pressure tested immediately after break-in. :lol:

All in all, Len's point is probably the easiest for your purposes here: if there is a descrepancy in one then something isn't doing it's job somewhere (rings, valves, head gasket) or everywhere but one or two.

Another thing I have done [though I'm rustier than some of the parts you're looking at!], easy, but mixed results if "loose" all over, or evenly but not perfectly "tight" - cross-talk in bad headgasket will really mess with your mind too. In-gear and blocked, give it about 50psi from your compressor in each hole about mid-compression stroke and follow the hiss or gurgle etc. An inline valve, timer (head count, stop watch, whatever), and shot of oil on the cyliner then second test : poor man's leak down test!

This post was edited by spiffy1 at 10:08:55 03/04/09.



Replies:




Add a Reply

:
:
: :

:

:

:

:

:

: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.


 
Advanced Posting Tools
  Upload Photo  Select Gallery Photo  Attach Serial # List 
Return to Post 

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


Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre ... [Read Article]

Latest Ad: Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor [More Ads]

Copyright © 1997-2024 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