i have never in my life had an automobile carb ice, but small airplanes do . Why , explains your concern, Peter Maybe ambient heat and significant thermal mass of an auto carb exceeds evaporative cooling (in automotive use) ,—- driving around is only 20 hp of gas use . Airplane is 100’s of hp continuous , — evaporating that much gas for hours is a lot of cooling , ( think of it exactly as refrigerant flow) and airplane carb is in cold air stream at 100 mph too Its not just temp or humidity that causes ice it is the volume of gas you evaporate in carb , and rate , which can be solved for btu removed . Probably not enough to ice … Radiator is blowing hot air under hood too , the harder you push the car , the more heat it makes . Kind if balances out ? 1/2 the energy in gasoline ends up in heat , in an IC engine . On Oct 4, 2025, at 8:13 AM, dave mason <forwardlook300@xxxxxxxxx> wrote:
No icing below 32F because the humidity will be too low to cause icing? Sent from my iPhone On Oct 4, 2025, at 07:52, Peter Pellicani <pellicaniaerosvc@xxxxxxxxx> wrote:
John, I disagree with the temperature of 35 degrees. The temperature is really 67 degrees and below. Above 67 degrees no issues. Also, if operating below 32 degrees no issues. Please refer to the fourth paragraph of my previous email. Hope this helps, Peter. 61 Stick Sent from my iPhone
Begin forwarded message:
From: Peter Pellicani <PELLICANIAEROSVC@xxxxxxxxx> Date: October 20, 2023 at 10:35:51 AM EDT To: Rick Dutkiewicz <rdr_inc@xxxxxxxxxx>, dplotkin@xxxxxxxxxxxxxxxxxxx Cc: Rick King <rickking952@xxxxxxxxx>, chrysler-300-club-international@xxxxxxxxxxxxxxxx Subject: Re: {Chrysler 300} 64 K Cross Ram
My 61 Newport has the G induction 413. I first installed the complete stock exhaust system with no heat (blocked off). Ran good indoors for DYNO run. Could not get chokes to completely open. I don't have manual chokes. The choke stoves will not get warm enough to open the chokes. Next run was with full heat. Start up and warm up was good, however, temperature at bottom of carbs were way too hot. Also, full throttle runs indicated that the restricted stock exhaust was choking the engine. Two four barrel carbs with 30 inch runners all going through a 2 inch hole.
Next, I installed the J K headers with full heat. Unbelievable response and runs. Temperature was way down and the only issue I had was the drivers side choke would not open fully. Passenger side was 75 degrees warmer than the drivers side. To correct this issue I made a wire connection to the driver's choke to hold the choke fully opened. After start up I connect this and all is well.
If the chokes are not fully opened, the secondaries will not open on choke stove set-ups.
Also, if you operate the engine when the ambient temperature is above 67 degrees you will not experience what I call "carburetor icing". The temperature drop in the venturi section of the carbs is 35 degrees. If you do the math 67-35 is 32 degrees, this causes ice to accumulate at the bottom of the carb/intake. This will give you all sorts of issues. This is why you need some heat operating below 67 degrees
No matter what you have installed, after running the engine on the highway for a hour, everything under the hood is 180 degrees (except the exhaust system of course).
I'm running the headers with full heat and 21/2 inch exhaust pipes.
Hope this helps,
Peter 61 STICK
On Thursday, October 19, 2023, 05:45:09 PM EDT, dplotkin@xxxxxxxxxxxxxxxxxxx <dplotkin@xxxxxxxxxxxxxxxxxxx> wrote:
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