OK This is the definitive SU float level tool:

$70 on ebay now.

 

http://www.ebay.com/itm/Datsun-240Z-SU-Carburetor-Float-Sync-Tool-/222448986888?hash=item33cafe2b08:g:NXAAAOSwwo1XdA16&vxp=mtr

Never saw that before, wonder if it's from England. Nice packaging, etc.

I would rather have the glass extend up a little higher, so it a bowl overflowed (it can happen while adjusting floats) the gas would run out the vent on the lid (through a hose routed to a catch can or container) instead of out the glass. Also, looks like it would obstruct an air cleaner, stock or otherwise. A sight glass has other uses besides setting the floats. It can be useful sometimes to verify that there's the right amount gas in the bowls (that the valves are working properly), while doing a test drive.

There's also a nifty sightglass from M-C for about the same price that has the right thread I think; it would probably obstruct an air cleaner, though.

I bought a low-tech version from ZTherapy for about half that price. Had to modify one of them so it wouldn't leak (maybe i got a bad one), but it can set so the plastic tube outlet is higher than the lid vent. Also, it can be used with an air cleaner, K&N's anyway.

Pretty cool, though.

 

Right, Arizona....

The M-C ones are glass, otherwise I would have got them. Probably not for automotive. Kind of big, too, probably wouldn't go behind the K&N's.  If these would go behind the K&N's maybe I would just leave them there, with a cap or plug or something.

Figuring out the fuel level in the float chamber is easy.  What we really need is for somebody to come up with a mechanism that allows the float level to be adjusted needing to remove the float chamber lid.

If I was at Hitachi or SU "back in the day"  I would have made the bowls so the whole darn thing is adjustable up and down by 1cm.... forget bending the float tabs over and over again.

Mikuni and SK have externally adjustable floats but it is a somewhat complex set of parts and the bowl is internal.

Just raising and lowering an external bowl seems to be the easy route for the early SU design.

Edited March 25, 20178 yr by 240260280

44 minutes ago, 240260280 said:

If I was at Hitachi or SU "back in the day"  I would have made the bowls so the whole darn thing is adjustable up and down by 1cm.... forget bending the float tabs over and over again.

Mikuni and SK have externally adjustable floats but it is a somewhat complex set of parts and the bowl is internal.

Just raising and lowering an external bowl seems to be the easy route for the early SU design.

I've thought about making the bolt that mounts the fuel bowl into an eccentric/offset bolt with a 0.5 cm offset... Someday I'll have time to make one...., two I guess.

If you could figure out the volume per length of the hose, you could get 1cm playing with the hose from the bowl to the nozzle?

Site, That won't work. You need to change the height of the float with respect to the height of the nozzle. Any changes you make with the routing of the tubing will have no effect. Think "water level" when building a deck. The tube position/routing doesn't matter.

zKars, An eccentric bolt on the bowl mount is a really interesting idea. I think I'll poke around with that too when I get a chance. So simple!

19 minutes ago, Captain Obvious said:

zKars, An eccentric bolt on the bowl mount is a really interesting idea. I think I'll poke around with that too when I get a chance. So simple!

That's me, simple.