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

Highest compression gas motor

Welcome Guest, Log in or Register
Author 
550Doug

12-04-2004 18:56:39




Report to Moderator

Are there some gas motors with higher compression than others? What is the normal range of gasoline compression?

Thanks




[Log in to Reply]   [No Email]
RAB

12-05-2004 00:05:44




Report to Moderator
 Re: Highest compression gas motor in reply to 550Doug, 12-04-2004 18:56:39  
I would think 6 to 10.5 would be the "normal" range for most motors.
Kero burners were lowest ratios, below 5, to prevent pinking, and pre lead-free engines with electronic sensing (that retards the ignition, on sensing detonation), were at the top end, as european car manufacturers went for smaller engines with higher compression rather than "cubes" like the american ones.
Of course, there are always those that say "what is gas?" and use that term for any special mixture of methyl, ethyl, or whatever, including water injection.
F1 cars all burn the same fuel because they used to have special formulations from their sponsors to up the octane rating, so the minions buying their product thought it was better than someone elses!
But there we are, even a diesel comp ratio would run on a gas engine quite nicely - at the summit of Everest!
Regards, RAB

[Log in to Reply]  [No Email]
Bob

12-04-2004 19:09:02




Report to Moderator
 Re: Highest compression gas motor in reply to 550Doug, 12-04-2004 18:56:39  
Are you talking compression ratio, or compression PRESSURE?

Some old engines are in the 4:1 compression ratio range, and probably will only have 40 - 60 pounds of compression, while exotic-fueled engines can have at leat 12:1 compression, and over 200 pounds of compression pressure.

And then, of course, there's the diesels, with 15:1 - 22:1 compression ratios, with 400 to 600 pounds of compression pressure.

[Log in to Reply]  [No Email]
JT

12-06-2004 07:13:19




Report to Moderator
 Re: Highest compression gas motor in reply to Bob, 12-04-2004 19:09:02  
a lot of the naturally aspirated racing engines are running 12.5-13.5:1 compression ratio, but have to run 108-112 octane racing fuel. Most normal stock gas engines have a compression ratio of 6.5-8.5:1.



[Log in to Reply]  [No Email]
buickanddeere

12-05-2004 15:20:48




Report to Moderator
 Re: Highest compression gas motor in reply to Bob, 12-04-2004 19:09:02  
Plus those turbo and supercharged spark ignition and compression ignition engines have an even high "effective" compression ratio and combustion chamber pressures. You can get unleaded gasoline up to the 115-117 range with toulene and xelene (spelling?). Now add some lead and that's where the 145 military AV gas comes from. They even used water injection on top of that. The LS2 corvette and Pontiac GTO run about 10.9 to 1 on pump premium.

[Log in to Reply]  [No Email]
Ray,IN

12-05-2004 21:07:46




Report to Moderator
 Re: Highest compression gas motor in reply to buickanddeere, 12-05-2004 15:20:48  
I once had a 1965 Olds 442(sure wish I had kept it). The 442 stood for: 4=400ci,4=4 speed, 2= dual exhaust. The engine had 13/1 compression from factory. That model was one of the big muscle cars of the era.



[Log in to Reply]  [No Email]
Ray,IN

12-05-2004 21:11:45




Report to Moderator
 Re: Highest compression gas motor in reply to Ray,IN, 12-05-2004 21:07:46  
Now that wasn't right! It should read: 4=4 barrel carb, 4=4 speed, 2=dual exhaust. Hey- give me a break; that was a few years ago.



[Log in to Reply]  [No Email]
buickanddeere

12-07-2004 13:35:25




Report to Moderator
 Re: Highest compression gas motor in reply to Ray,IN, 12-05-2004 21:11:45  
I'm not too certain about the 13 to 1 compression.



[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