Low tech tool

lindenengineering · Post by **lindenengineering** » Fri Dec 28, 2007 8:49 am

Hey guys
Just a thought.

Should you want to check your carburetor balance and have no special tool, then try the "hose balancer'. You will need a length of vacuum hose that will fit comfortably inside you right ear hole or left for that matter. I have used an 1/8th vacuum line about 24 inches long.

With the carburetor feed plenum off and propped up, you can rest the hose at a selected point holding it in place about 1" protruding over the inlet throat into the air stream at a 90 degrees position with a forefinger.
The roar of air will have a certain tone to it, try to remember the tone heard in the hose, then switch the hose to the other carburetor holding it in exactly the same position and location. Listen to that roar tone and compare and repeat, memorizing it. Again continue the switch several times to compare. It takes a bit of practice but within a few sessions you should be able to judge which carburetor is leading and then adjust it to "roar" the same.

Now this might sound (excuse the pun) a bit ancient or "hoaky" but it was the method to tune multi carburetors when I was a student. Multi carburetors is the word. I worked with an Italian Master Mech at one stage in my apprenticeship who could make a V12 Jag purr on four Strombergs with his hose tuner. "Buenisimo Multi Cylindri
Have a go!
Dennis

Kiwibru · Post by **Kiwibru** » Fri Dec 28, 2007 11:13 am

Dennis,

You wrote: With the carburetor feed plenum off and propped up, you can rest the hose at a selected point holding it in place about 1" protruding over the inlet throat into the air stream at a 90 degrees position with a forefinger.

Is this 90 degrees with the hose end up or down? I am assuming down but wanted a detail check...
Thanks too for the blow by blow carb info. It does help destroy the hidden mysteries of the dreaded carb-o-tune!

lindenengineering · Post by **lindenengineering** » Fri Dec 28, 2007 7:25 pm

Kiwibru
Air is rushing into the carburetor throats in a downward direction.
The hose tester needs to be at 90 degrees to the air flow, hence held flat down onto the carburetor top cover and held with your forefinger.

I tried it today and suggest pointing it at the cross bridge tube as you face the carburetors.

Glad you find the info of use. Evan Hillman always considered this a black art. do you not know black is beautiful these days?
More to come, happy new year
Dennis