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

Propane vs Gas Engine Differences ?

Welcome Guest, Log in or Register
Author 
MMB

12-07-2005 10:14:32




Report to Moderator

Can anyone out there explain how (and why) a propane powered tractor engine from say the 1950's is different that one that is gasoline powered? Is the compression ratio different and if so by how much? Are the heads or any other engine parts different?




[Log in to Reply]   [No Email]
RN

12-07-2005 11:23:40




Report to Moderator
 Re: Propane vs Gas Engine Differences ? in reply to MMB, 12-07-2005 10:14:32  
Note also camshaft timing has no overlap to prevent backfire, Carb/fuel system different- LP liquid-to -gas relief valving/heat exchanger. RN.



[Log in to Reply]  [No Email]
buickanddeere

12-07-2005 19:08:25




Report to Moderator
 Re: Propane vs Gas Engine Differences ? in reply to RN, 12-07-2005 11:23:40  
Deere kept the same cam timing with LP and gassers.



[Log in to Reply]  [No Email]
lpgasonly

12-07-2005 10:36:17




Report to Moderator
 Re: Propane vs Gas Engine Differences ? in reply to MMB, 12-07-2005 10:14:32  
LP gas is a higher octane than gas. That is why it can use higher compression. It got a little more power out of the higher comp..Factory LP's got more comp. by either piston or head changes. Most used better exaust valves also.
Conversions soon followed because of the no carbon and longer oil and eng life. Also LP was a by-product of the refinery and sold dirt cheap. Another benefit was no one would steal your gas if you left the tractor out in the field.

[Log in to Reply]  [No Email]
colekicker

12-07-2005 10:18:01




Report to Moderator
 Re: Propane vs Gas Engine Differences ? in reply to MMB, 12-07-2005 10:14:32  
Some tractors have different heads, pistons and intakes. It takes more compression of LP to get the same power that you get out of gas. Farmalls changed heads and pistons if you bought a factory LP. Maybe that helps.



[Log in to Reply]  [No Email]
Jon Hagen

12-07-2005 15:40:41




Report to Moderator
 Re: Propane vs Gas Engine Differences ? in reply to colekicker, 12-07-2005 10:18:01  
A propane powered tractor will usually have higher compression to take advantage of the high octane fuel. Propane has no lead to lubricate the valves,so usually valves and seats were hardned. Propane goes into the engine as a vapor, so there is no need for any intake manifold heat. Cold air is dense air,so a heated intake manifold on a propane engine will actually hurt performance. Also a propane engine will usually have more initial ignition timing and may have a quicker advance curve. Most propane engines had the plugs gapped at a tight .015 because plug fouling was less of a problem and the shorter gap helped the spark jump the gap against the higher compresion/cylinder pressure of a propane engine. Some also ran a colder heat range plug because of less chance of fouling with propane fuel.

[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