Re: Withdrawal symptoms...
Ianredspecial wrote:
I used aluminium tubing like that for mine. It was warmer, but the noise was mental! Honestly, it was like having two engine trumpets coming directly into the cab.
I got some sound deadening material and glued it to the inside of the tubes, but it was still extremely noisy.
Suddenly the reason for them using the cardboard foam tubes was apparent. Lol.
After yesterday's experiment with my Trabant, I don't think I'm even going to attempt using the aluminum ducting on my 2CV!
I realize this does not have anything to do with my 2CV but does involve some "air cooled/heater" content.
I made a somewhat successful attempt at bumping the air velocity up on my Trabant which is also air cooled.
With the Trabant there is this large pipe and elbow that connects to the heat exchanger with a 3.25"/83mm inlet and outlet, then a short hose that connects from that to the diverter at the bulkhead. Inside this pipe is a screen with some material between it and this pipe that functions as a silencer. Where on the 2CV, the foam inside the cardboard tubes dampens the noise. I did not realize how much noise this device dampens.
So Saturday I used these silicone turbo hoses to mount a 4" in-line blower.
I also rigged up one of those temperature probes in one of the defogger vents to monitor the temperature coming from one of the defogger vents.
The result:
The noise was horrendous! It sounded like all the engine noise was being dumped into the cabin! The air flow had definitely improved. It was 41F/5C Saturday and cloudy. Ordinarily I'd have to wear a coat to stay comfortably but could have taken it off. The temperature coming out of the vents was 140F/60C. I did not test the temperature before adding the blower fan.
This car also has two 2"/50mm tubes that pumps air into the system from fan. One hose is mounted to the engine shroud and feeds air directly into the heat exchanger. Like the 2CV.
The other hose is inside the engine shroud connects to a shield around the exhaust manifold and pumps air into the baffle. I'm not sure why both hoses don't feed directly into the heat exchanger.
I'm using this 3" brake cooler blower mounted after the baffle at the moment. I can't tell that it does much while going down the road but it definitely puts out more air at tick over. No more engine noise but the fan is still quite noisy.
But someone on the Trabant forums mounted one in the short hose and it melted on them!
If room permits, I'm going to fit try to fit the 3" blower between the cold air duct behind the grill and force air directly into the heat exchanger (see the long hose that runs from the grill to the diverter). That way the fan doesn't get hot.
Here's the question. If I have a 4"/100mm blower and I'm trying to force air through a 2"/50mm hole in the heat exchanger, is that the same as using a 2"/50mm blower because I have reduced the inlet. I'm thinking this would act as a restricter.
So in other words, the actual inside diameter of the heating system is roughly the same size (3.25"/83mm). So maybe using the 3"/76mm fan would do the same thing?
Actually I could pull the heat exchanger off the car and enlarge the hole to 4" and weld a 4" inlet to feed more air into it.