Posted by JerryMT on January 05, 2014 at 06:34:33 from (206.183.116.145):
In Reply to: Frost on Carb of gasser posted by landresource on January 04, 2014 at 17:52:57:
Bernoulli's equations relates pressure to velocity: p/rho + 1/2 v^2=constant. Using the gas law, p/rho= RT gives us RT + 1/2 V^2 =Constant.
So as velocity increases, T decreases. The other situation that is occuring is that gasoline droplets volatilize in carb venturi as the pressure drops and that further decreases the temperature as the change of phase from a liquid to a gas takes energy and that energy has to come from the air so it cools the air even further. The net result is that the surface area around the venturi gets very cold and frost will form on the carb at ambient temperatures as high as 50°F. External frost won'tharm performance as long as the likage is not effected.
If the air is very humid, ice will form on the fuel nozzle and in the venturi, throttle plate, etc internally and cause really ratty running. There is nothing that can be done save heating the inlet air to prevent this type of internal icing. Generally allowing the engine to run ratty will eventually allow the exhaust air to heat the intake manifold on these old tractors and that allows the internal icing to clear up. Many of you remember when the first EPA emmission regs were applied to cars that heated intake air was used because of the leaned out mixtures used on carbs of that era were particularly susceptable to internal icing. Recip engines used on aircraft use carb heat to preclude internal icing also.
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 ]
Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
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.
