Quiet Down A Dual Carb Engine..It Works, Honda Goldwing 1200 Air Boxes....Sound Clips Options

[nathansnathan]

I finished putting mine together - i got the parts at Pacific customs;it was expensive. I don't know how well it all works as I need to figure out some linkage to run it. .. made it for my bus.
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.eggscollective.org-11782-1458335406.1.jpg)

[rhodyguy]

WOW! BIG! A CFR cable setup or center pull might be the way to go.

[7TPorsh]

One arrived in the mail....bigger than I pictured. Hoping to get the other tomorrow.

I looks like I will need to fashion a baseplate to attach the new housing to the carb. The old KN plates are too small to cover the opening.

[7TPorsh]

Also ordered Honda air filters

[7TPorsh]

As I stare at this I am seeing another possible modification for Phase 2 after I get the stock boxes installed....and i want to put my rain tray on at some point.



The stock Honda boxes with tops won't clear the rain tray....but the bottom housings with a custom flat top WILL allow a rain tray. My thought is make a top out of flat Lexan that holds down with a wing nut and seals the air filter...top of the KN Porsche filter lines up perfect and the velocity stacks clear.

Cut a 3.5" hole in the side of the housing base on the outside. Plumb a 3.5" "cold air" pipe down through the existing heater tube holes in the tin. If you have heat maybe to rear wheel well?



These modified housing would use air filters so there isn't a need to have a cone filter in the setup...just a place to pull in air.

[914forme]

Your plan means you will be drawing hot engine air into your carb. See how it does with out a warm air system.

[JimN73]

As I stare at this I am seeing another possible modification for Phase 2 after I get the stock boxes installed....and i want to put my rain tray on at some point.

The stock Honda boxes with tops won't clear the rain tray....but the bottom housings with a custom flat top WILL allow a rain tray. My thought is make a top out of flat Lexan that holds down with a wing nut and seals the air filter...top of the KN Porsche filter lines up perfect and the velocity stacks clear.

Cut a 3.5" hole in the side of the housing base on the outside. Plumb a 3.5" "cold air" pipe down through the existing heater tube holes in the tin. If you have heat maybe to rear wheel well?

These modified housing would use air filters so there isn't a need to have a cone filter in the setup...just a place to pull in air.

You can download a decibel app to your favorite electronic device and quantify the difference between the existing and new systems. Might be good info.

[7TPorsh]

Well they are on the car and I can't be happier. I made a pair of base plates and fabricated a hold down using some plate steel and a carriage bolt and voila!.

[7TPorsh]

But here's the kicker. I started the car and went for a drive and it sounds awesome. I would say a 70% noise reduction from the intakes; I can hear the header now.

Here's the comparison....same street....pardon the shift clunks....trying to hold the phone, steer, shift, gas......

BEFORE:


https://www.youtube.com/watch?v=zH2VVcBJlzI


AFTER:


https://www.youtube.com/watch?v=wEEkFp5U6Tw


AFTER ON ANGELES CREST


https://www.youtube.com/watch?v=iuXd1U63at4

[rhodyguy]

Very quiet now. VERY nice for a full day behind the wheel. The 2 horned ends on the top are for induction yes? How much were the GW filters?

[7TPorsh]

Very quiet now. VERY nice for a full day behind the wheel. The 2 horned ends on the top are for induction yes? How much were the GW filters?

Horns on top are the intakes. I used the K&Ns I had since the Honda paper filters I bought were a little too small and didn't clear the velocity stacks. The K&N seal down tight.

The pair of boxes were around $35 delivered....if you don't use velocity stacks the Honda paper filters will work....filters are about $10 each.

[7TPorsh]

It's so much quieter I have to watch the tach so i don't over rev. The difference is like going from someone yelling in your ear to someone yelling 20 ft from you with their hands over their mouth...

[rhodyguy]

Are those the 2 1/2"ish VC stacks? For a long day in the drivers seat I resort to foam ear plugs.

[SA-914]

What size KN filters did you end up with?

[rhodyguy]

Rain tray interference...are you using CB tall intakes or short ones?

[7TPorsh]

Yes there will be interference with the stock rain tray. I think I have the tall intakes. I eventually will probably make up some sort of shallower tray but for now the car isn't driven in the rain so not an issue.

The K&N filers are the ones I had with the chrome weber housings. Shown in the picture above.

[7TPorsh]

The Honda filters are not quite as long.

[7TPorsh]

Are those the 2 1/2"ish VC stacks? For a long day in the drivers seat I resort to foam ear plugs.

Yep. 2.25" stackers

[Bossman]

This looks great. I just ordered a set off EBay.

[Bossman]

As I stare at this I am seeing another possible modification for Phase 2 after I get the stock boxes installed....and i want to put my rain tray on at some point.



The stock Honda boxes with tops won't clear the rain tray....but the bottom housings with a custom flat top WILL allow a rain tray. My thought is make a top out of flat Lexan that holds down with a wing nut and seals the air filter...top of the KN Porsche filter lines up perfect and the velocity stacks clear.

Cut a 3.5" hole in the side of the housing base on the outside. Plumb a 3.5" "cold air" pipe down through the existing heater tube holes in the tin. If you have heat maybe to rear wheel well?



These modified housing would use air filters so there isn't a need to have a cone filter in the setup...just a place to pull in air.

If you're not running heat how about usin the existing heater tube holes to run the "cold air" intake pipe out in front of the engine, under the car (next to the air deflectors?) for a cold air/ram air type set up