Tractor Talk Discussion Board |
Re: Carburetor Backfire
[ Expand ] [ View Follow Ups ] [ Post Followup ] [ Return to Forum ]
Posted by Joe (Wa) on May 28, 2004 at 21:01:56 from (65.126.49.81):
In Reply to: Carburetor Backfire posted by Larry T on May 28, 2004 at 07:20:42:
Larry, The spring just puts tension on the screw to keep it from vibrating out of adjustment. You have afterfire right, up the stack as opposed to backfire out the carb? You could have either but the former is much more likely in this situation. Afterfire occurs when you are going down a steep grade because the governor closes the throttle. When the throttle plate is closed it uncovers the idle circuit orifice in most carbs. So now you have the idle mixture screw adjustment as well as the power screw adjustment to content with. When you close down on the power screw, it reduces the amount of fuel delivery but has less effect than normal because the throttle plate is closed. You are providing most of the fuel to the engine via the idle circuit. Idle mixture adjustment screw can either control the air or the fuel in the idle circuit depending on your type & model carb. Also remember that your engine vacuum is higher than normal. A small air leak will have more affect on the combustion mixture. The bottom line is the combustion mixture is too lean or too rich causing a slow burn. Joe
Follow Ups:
Home
| Forums
Today's Featured Article -
Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
... [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 HeadquartersWebsite Accessibility Policy |
|