So I went out and really put some strain on the new carter. Some wheel spining, some high speed, some acceleration and what not. Got home and looked at the carb and there was ice on the throttle body. Still ran fine and what not and I know it just is caused by the large amount of air going threw the carb. But has anyone had a issue with this. Thanks. Here is a pic. You can see were it was wet.
Is the heat riser working? The evaporation of the fuel as it passes into the intake manifold has a pronounced cooling effect- - - -that's why gas-engine airplanes use "carburetor heat" on takeoff and landing to assure there's no stall due to carburetor icing at critical moments in the flight. The heat riser is supposed to route exhaust gas under the carb base to minimize the tendency to ice, but unless the ice also forms on the inside of the carb, it won't seriously affect performance. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
It is the heat riser from the rochester B. I really could not tell you if that is right or not. But that is what I have running on it. If there is a carter plate I need to run I will for sure get it. Also I did not look inside for Ice. But I will take a look later. Thanks for the advise.
The heat riser is the flapper valve in the exhaust manifold, the one with the weight on it that has a habit of locking up due to rust. It won't change no matter which carb you run, but it needs to be in working condition to allow for quick warm-up and good vaporization of the fuel at all times. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Replaced my Rochester B with a Carter YF today. WOW I mean WOW. It idles way better. Has way better responce. I can put to gas on and it gose. It feals like a new truck in comparison. Made a quick video on it. There is a part were it is running at the end.
Thank you all stovebolters for your advise on carbs. It paid off.
Looking at your you tube video from your other post it looks like your heat riser valve is working. Towards the end of your video you give it some gas. The wieght under the manifold moves
check the spring on the other side of shaft that the wieght is on. It may be missing
Hy GrandpasTruck, the heat riser Hotrod Lincoln is talking about is the valve in the exhaust manifold which controls the flow of exhaust out of the exhaust manifold. On Chevies the valve is controlled by a thermostatic spring, on GMCs the valve can be adjusted and locked into position. Many of the valves are siezed in position, or the springs are broken, or the stud that the spring pushes against is rusted off. Better do some investigating, hope that helps.
carb icing depends on atmospheric conditions, it happens in a certain humidity range and dew point temperature, it becomes a problem when the icing is internal, a fog of frost on the outside of the carb isn't uncommon, just not noticed cuz you don't usually pop the hood and look at the right time
if it wasn't affectng how the engine ran, it's not a problem .... the "modern" fix was to warm the intake air by the addition of a heat gathering shroud feeding the air cleaner, a setup found on 60's/70's GM engines
No heat on take off Jerry, you want max power then and with the throttle valve open you won't have a problem with carb icing, only with closed or low throttle settings. Have had the problem with carbureted Lycomings several times. Denny Graham Sandwich, IL
Right- - - -the landing checklist on the Aeronca Champ my friend and I used to fly included "carb heat on"- - - -I didn't think about the power loss on takeoff. I believe that one ran a 65 HP Continental 4-cylinder. Those engines had a nasty habit of seizing up a piston on climb-out, so getting up to a safe altitude always increased the pucker factor a little! Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
I would bet the ethanol has something to do with along with the weather conditions. if the icing doesn't cause a problem, the only draw back would be rusting of the carb base and general dirt collecting on the wet intake. The exhaust heat should take care of most of it, but even with heat, in the right condition it can happen to any carb.
On some nights, my race car would shut off each pass just after the finish line due to icing. I was running 100% methanol at the time, so the cooling effect was way worse. Its still kinda cool to open the hood and see ice on a engine in the middle of summer!
O cool thank guys. For some resone I was thinking the spacer between the carb and the spacer is what we were talking about. Yes the heat riser works. Spring seems to be working from what I can tell. But it was still kind of cool to see ice form when it was worm out side on a hot engine. Guess Ill see how it works out for me. Thanks for all the input.
I had a friend who was experimenting with liquid Propane injection on a Chevy V-8 about 35 years ago. He was using a modified carburetor throttle body with solenoid-type injectors mounted into the intake manifold just below the throttle plates. I've seen that intake with a couple of inches of ice built up on it from the cooling effect of the Propane evaporating as it hit the airstream. He finally had to install a couple of small squirrel-cage electric blowers to pick up heat through a sheet metal duct surrounding the exhaust manifolds and blow it on the intake to keep the ice from locking up his throttle linkage. Propane evaporates at around -70 degrees Farinheit, so there's a massive cooling effect as it changes from a liquid to a gas. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
