ESE's works engine tuner

[adegnes]

I'll try to make something similar to this

[husaberg]

Was granted some dyno time later today by girlfriend.
Gameplan:

1. Go over and tighten mounts as much as possible without restricting movement, shim out where/if necessary.

2. Rubber hose extension on intake to make it softer, will be hopelessly long but for testing purposes it'll be fine.

3. "sock" over jet block, material from fuel filter or something.

4. Better jet "shield".

4. Different carb, my neighbor maybe had one lying around.

Methodical one thing at a time?

or everything at once?

[adegnes]

For once I think I'll go with the pointy ear approach.

[adegnes]

Snuck out and had a quick look at the pwk bowl and jet block.
The main jet is "shielded" well from factory. Without making a well and extending the jet, a small piece of foam is all that will fit.
Enough to help you think? Guess there's only one way to find out.



I could make a well and maybe extended the main jet with a short piece of tubing.

[husaberg]

These are available for mikunis

There is also larger float bowls available for larger Keihins but they are very spendy.

All these though are more bandaid fixes for what is likely a BF issue.

[adegnes]

These are available for mikunis

There is also larger float bowls available for larger Keihins but they are very spendy.

All these though are more bandaid fixes for what is likely a BF issue.

Shh..

Where do you draw the line between a plenum and the intake sizevise? Maybe I could resurrect TZ's plenum idea, mount the carb to the frame and use a flexible hose between it and the plenum.

[philou]

Boyesen sells bowl that would reduce the emulsion. I do not know if it really works





Look fuel inside the bowl Lectron carb at 1'37 m

http://m.youtube.com/watch?v=ZgbXSJ-aoQY

[Frits Overmars]

Rubber hose extension on intake to make it softer, will be hopelessly long but for testing purposes it'll be fine.

Yeah, right. It may solve your vibration problems but it will hopelessly upset inlet resonance, unless you compensate with a later-closing disk or/and a larger crankcase volume, in which case you alter more than one crucial thing and you won't know what did what.

I'll try to make something similar to this

That's an idea I like very much. I've seen deepened float bowls before but always in combination with the main jet at its original height.
Lowering the main jet as well may make all the difference, possibly even without the red foam. But as Husaberg says, the real goal should be to eliminate the vibration.

Foaming fuel in the float bowl makes the fuel less dense, so the various fuel jets that are really volume-flow controlling devices, may pass less fuel mass.
The diminished fuel density will also offer less buoyancy to the float, so the fuel level will become higher, partly compensating, completely compensating or overcompensating for the diminished mass flow through the jets. In short: carb vibration may enrich the mixture, or make it leaner, or both, at various revs.
How about a nice simple injection system?

[adegnes]

Yeah, right. It may solve your vibration problems but it will hopelessly upset inlet resonance, unless you compensate with a later-closing disk or/and a larger crankcase volume, in which case you alter more than one crucial thing and you won't know what did what.

That's an idea I like very much. I've seen deepened float bowls before but always in combination with the main jet at its original height.
Lowering the main jet as well may make all the difference, possibly even without the red foam. But as Husaberg says, the real goal should be to eliminate the vibration.

Foaming fuel in the float bowl makes the fuel less dense, so the various fuel jets that are really volume-flow controlling devices, may pass less fuel mass.
The diminished fuel density will also offer less buoyancy to the float, so the fuel level will become higher, partly compensating, completely compensating or overcompensating for the diminished mass flow through the jets. In short: carb vibration may enrich the mixture, or make it leaner, or both, at various revs.
How about a nice simple injection system?

Played around with jet sizes and foam around the jet on the roller today, not much luck.
I'll solder up an extended emulsion tube and make a well in my float bowl.

Injection is starting to sound tempting!

[Frits Overmars]

I'll try to make something similar to this

What are you going to call your next video? Deep Float ?

[adegnes]

What are you going to call your next video? Deep Float ?

[TZ350]

Maybe I could resurrect TZ's plenum idea, mount the carb to the frame and use a flexible hose between it and the plenum.

Pumper Carb maybe? ....

Tillotson HL360A (24mm venturi).

Made 28 rwhp with this puppy, no bell mouth and bolted hard to the crankcase. Vibration does not seem to affect them.

[adegnes]

Pumper Carb maybe? ....

Tillotson HL360A (24mm venturi).

Made 28 rwhp with this puppy, no bell mouth and bolted hard to the crankcase. Vibration does not seem to affect them.

It's been on my mind more than one time...
With a new valve cover it would give me a shorter intake too.
I'll have to sleep on it.
I know the Zundap rvrt crew are going pumper now, after similar issues with fuel foaming.

http://www.deraceheldenvanweleer.nl/...;topicseen#new

[oldjohnno]

Getting the vibration down to a reasonable level shouldn't be too difficult with a small engine. The one I had trouble with had an 86mm bore, though it only revved to 8500. To find a workable BF in a reasonable time (and without stripping the engine countless times) I overbalanced the crank to nearly 70% then experimented with small external bobweights that could be changed quickly that were attached to the flywheel and primary drive end. I don't know why but the carburation seemed to be upset more by overbalance than underbalance, even though underbalance felt worse through the 'bars.

The best results came from 60 to 65% so the crank was removed one last time and balanced to that figure. But the small amount of external weight didn't seem to cause any problems at all and I'm sure I could have left it that way. Could be difficult to attach weight to the drive end with a disc valve though.

[husaberg]

Getting the vibration down to a reasonable level shouldn't be too difficult with a small engine. The one I had trouble with had an 86mm bore, though it only revved to 8500. To find a workable BF in a reasonable time (and without stripping the engine countless times) I overbalanced the crank to nearly 70% then experimented with small external bobweights that could be changed quickly that were attached to the flywheel and primary drive end. I don't know why but the carburation seemed to be upset more by overbalance than underbalance, even though underbalance felt worse through the 'bars.

The best results came from 60 to 65% so the crank was removed one last time and balanced to that figure. But the small amount of external weight didn't seem to cause any problems at all and I'm sure I could have left it that way. Could be difficult to attach weight to the drive end with a disc valve though.

hose clip.............

This can be offset by creating an opposite force in the flywheel,as I tested this by clamping a hose clip onto the ignition,with the screw positioned 1/2 way opposite between the two pistons at TDC.
But this "fix" creates a huge rotating out of balance force on one end of the crank - and the RZ case has enough trouble maintaining main bearing crush on a balanced assembly, without pounding it to death running an out of balance flywheel.
The carbs and bars vibrate enough to froth the fuel without soft manifolds - so the idea was dropped ( on my head).