BING balance via manometer.

[Roy Gavin]

Um , as Berryh has pointed out in his post and Bing confirm, the whole point in tuning carbs is to get them as lean as the machine will tolerate, anything else is a waste of fuel.

Phil Irving covers the subject well in his book Tuning for Speed , which at one time was considered essential reading for anyone who intended dabling with a motorcycle.

Maintaining a sufficiently rich mixture in transition is the determinant to how lean you can go , as confirmed by Bing.

The weakest mixture the machine will run cleanly on is the one which makes most power, so the statement that a Colortune sets the mixture too lean for maximum power is, err, stuff and nonsense.

There is no problem with combustion on any of my airheads, the mixture is a uniform colour throughout, so I don't know where the claims that the mixture is too uneven to get an accurate read from a Colortune come from - probably from someone who has never used one.

When tuning the mixture in transition on a well designed CV carb like a SU, apart from picking the right needle from the 600 odd SU supply, careful selection of one of the many piston return springs which SU offer is the secret to success.

Bing offer two springs. The latter spring is much the stronger and will enable you to set the steady rate mixture lean for maximum power and economy, while maintaining good drive-ability in transition.

Set up this way my 1000cc 37/11 G/S will do over 600 km before it needs around 30 litres sloshed in, and it is a real flier too, keeping up with my mates original old one owner Suzuki GSXR 750R , if I wring it's neck!

FWIW my 1600 cc car which has fuel injection which leans the mixture right off when cruising also does 600 kn from 30 litres ,at a steady 110 km/hr , so there is probably a bit more to come with the bike.

But only if I could find a couple of good MC type SUs ( or commission a batch of 100)- these Bings are a crude and inefficient copy of a Stromberg, which was a crude and inefficient copy of a SU !

[bbelk]

I have been using this one since Randy showed it to me a couple years ago.



It works fine except when a hose falls off or I turn something the wrong way and it sucks the oil through the system. To avoid that problem I had actually designed this one in my head, but never got around to building it.



Having seen it, I may be inspired to build one.

The Third one, with the pretty blue colored liquid ........ Maybe blowing into one tube will prime the siphon.
Ken

If one side over powers the other, I agree that would dump all the oil into one side until the other side got empty at which time it would just bubble. My thought is that you would just have to unplug the hose going to the side with two much oil for a brief second and the lopsided vacuum should prime it.

I am also working on a design to hook up to my house air conditioner to tell me when the air filter needs changing.

[bbelk]

My design for the blue water idea is something like this.

This is the water level gauge for my rainwater collection system. Currently empty due to the drought.



It is a plastic tube designed to cover an 8 foot florescent light fixture. It happens to fit very snugly over a standard PVC pipe fitting size. I was thinking I would put two of these side by side with a pipe connecting them at the bottom and a tubing of the right size to plug into the carburetors coming out of the top. I could fill them with colorful liquid something less than half the total height so that if one side is over powered, it just bubbles through. There is no repriming problem as the liquids will just reset if you correct the imbalance.

Its not very portable, but you could drink several beers while admiring and talking about it.

[Major Softie]

Its not very portable, but you could drink several beers while admiring and talking about it.

I'm sorry, but I'm failing to think of anything that would not fall into this category.

Okay, not everything can be admired, but the other thing.....