5 replies to this topic

[Colakurt]

I got a 1380cc fast road engine with a Weber DCOE carburetor, and I am quite happy with the performance but the noise is insane, we are talking 95dB on highway and up to 105dB during acceleration.

I have done a complete noise treatment of the car and firewall with both vibration dampening material and sound insulation which gave me a 6dB reduction, but I still think its too loud, even with earplugs.

 

So, I got an idea to make a cold air intake for the carburetor, and hereby moving the air intake point to the front of the car, pointing away from the firewall, and hoping that would help on the noise, but does anyone have experiences with such a concept? I am not looking for any performance gains, but would of course like to make something that isn't reducing the performance either.

 

My idea is to make a box roughly the size of an air filter around the RAM horns on the carburetor, and from there, run a pipe of about 75mm or 3" to the front of the car, or at least to the front side of the valve cover, and then place the air filter over this pipe.

 

Does anyone have any ideas or inputs regarding such a project? Would it help on my noise issue? and what would the effects be on the performance of the car?

 

I have thought about something like an air box from a modern car to house the filter in, but I think it will be dififcult to fit in the engine bay of my Mini.

Attached Files

•  Cold Air intake.jpg   64.31K   0 downloads

Edited by Colakurt, 15 September 2024 - 07:18 PM.

[nicklouse]

Wont do much as you will still have the sound coming straight of of the carb and then hitting the back face of whatever you make.

[Colakurt]

The hope was of course to make the box by the carb ram horns of something that would at least to some degree be able to reduce the penetrating sound. 

Maybe fiber glass or some sort of thick metal plate.

Edited by Colakurt, 15 September 2024 - 08:44 PM.

[absx2]

I did one probably 20 years ago and it worked fine and was so much quieter, it was along similar lines to the Vortz airbox which is where I got the idea but I had a single flexi hose terminating close the the grill.

 

Just hear the difference between twin SU`s running on cone filters and a standard airbox it`s massive.

 

I made mine out of 1.6mm commercial aluminium and you can get the alloy tube and flexi hose from ebay

[Colakurt]

Great to hear, I'm hoping for something closer to the standard airbox as you say. I like the sound, but the sound level is just too high as it is now.
I think I will try to make something out of fiber glass or maybe try to reshape some plastic tubing with a heat gun, just for a concept demo as a start.

[timmy850]

If you do a google search for “mini miglia engine” you’ll see the various air boxes that’ve been made for Webers to get better performance. You could use a similar concept for a road car too

 IMG_2024.jpeg   95.63K   3 downloads


One of the local guys here made up an alloy airbox and I tried to make it fit my mini, but the amount of room to work with on a standard Mk1 bulkhead is pretty slim

Edited by timmy850, 17 September 2024 - 04:14 AM.