Let's Talk Cyclecars

Merry Christmas!

 

Have you dropped a bowl and looked to see if you can verify your theory by looking at the wet level mark left by the fuel? I imagine you've already verified the float levels are set correctly?
What intake setup are you running? Are you running a stock elbow setup, velocity stacks, straight? The carbs angles are important and sometimes they need to be twisted to compensate for hard riding/leaning on airheads. You'll notice on performance Guzzi bikes the intakes allow for the carbs to be tilted in and up so that as the bike is put in a hard lean the float bowl stays perpendicular to the ground and fuel can flow down into the head. Depending on your intake setup you might be able to twist the carbs a bit to achieve this affect. Also don't know the specifics of your motor, but PHF-30's seem on the small side for a 1000cc Guzzi in a vehicle as heavy as a Cyclecar. How do they perform otherwise?

 

My error, they are 36mm carbs (30's were original for the bike). I have set the floats and double checked them. I don't see how the fuel would leave any kind of line in the float chamber as this happens so fast. I thought about twisting the carbs and that would work for one of them turning one way but bad for the other one. Here is a pic of the carb setup.
Thanks for your reply. I hope you see something that might help.

 

If you are turning both ways, angle both carbs and re jet as needed. Merry Christmas, Gary

 

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Hello Jonto,
Cute and relatively small Clément-Bayard was my old love (soft-top coupé, two seats), even thinking about building one scaled-down copy one day (didn't know that people allready build replicas around our big World)...








It seems to me that Charon was similar but something bigger automobile, at least according to one that I saw in Belgrade Automobile Museum! There were rumors that it once belonged to Petar I Karadjordjevic, King of Serbia, but probably was imported and reconstructed later. After German and Austria-Hungarian occupation in 1915, all automobiles in Serbia were or destroyed or confiscated and took away...

Ciao,
Zoran​

 

Charron probably made a wide range of models, most manufacturers did then.

 

What is this one, 1950's ?

 

Angle how? Do you mean rotate the carb on it's manifold? What about swapping the manifolds from side to side so that they angle outward rather than pointing inward? That would change the angle of the float pivot. Not sure what that would do.

 

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Hello Fred,​

I am not sure if changing angle of carburetors could have any good impact on your problem?

If you angled them either inwards or outwards - one carburetor should have better results only in left corners/curves and the other carburetor in right corners/curves, but each of them should have even worse results in opposite...

Therefore, should be the best position as it is (neutral)? Without a few experiments with changing types and models of carburetors (too complicated and expensive project) – it should be better just to change driving in such special circumstances? (or to accept all that issues as they are)

Ciao,
Zoran​

 

I think turning the carbs some on both manifolds might help with minimal side affects and costs nothing. Gary

 

I once had and sold a v-twin engine from a 24 Hanover cycle car , it was 76 cubes and they actually bent the rods in a dogleg so the cylinders were in line. The trans had hi low and reverse and the pressure plate was brass !


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Worth a try Gary; easy to do.
Thanks,

 

at Shelsley Walsh by Mark Turner.

 

http://justacarguy.blogspot.it/2016/12/1951-beboux-three-wheeled-car.html

 

How small of a car could one actually build and still legally put it on the road?


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Depends on where in the world you are. All countries require some degree of tribute or submission to the established motor industry; how much is only a matter of degree.

One of the British motoring weeklies ran a "minimum-car" design exercise a few decades ago. I'll see if I can find anything on it.

Reality, on the other hand, has seen all aspects of the Alchian-Allen effect manifest in vehicle size and weight ...

 

I'd say a Peel 50 is about that small.

 

My reaction the last time we had this one:

 

About fuel surge:

I have seen one center much large remote float chamber from a GP carb placed in the middle between the two carbs

You could also use a "pumper carb"

The other thing I have done is dry sump the carbs ..... remove the floats and use a scavenge pump at the desired upper level. I have used Jaguar SU choke pumps ..... you must turn on the scavenge pump before the feeder pump

 

Thanks Bluto. The Dellorto carbs are called pumpers due to the accelerator pump built into them. That may not be what you mean. They have the float chamber built into the bottom of the carb casting and it feeds the main jet. I don't know if that could be changed easily. If I tilted the top of the carb to the outside that would make the fuel surge away from the vent and may solve the problem as Gary suggested.

 

That's a new avenue to explore in something I've sporadically wracked my brain over. Thanks!

 

I was actually thinking of this kindda thing ..... Remote float carbs

http://way2speed.blogspot.com/2013/08/posa-fuel-motorcycle-carburetor-racing.html

I have a pair of these.....




I know Dellortos I have used them from time too time ..... go look at a Velocette Thruxton They use a remote float camber GP Carb. Sorry but I've no photos of any of my thumper road racing bikes. I might be thinking of one of the various Manx I've owned.

People used to say they were hard to get an idle from. I never had that problem.

 

Ned

Look into how fuel surge was controlled in Lola Super Vee
The little Jag bits were used on many of them.

 

Fred

A friend of mine has a "Two of everything" SS100 Brough The carbs on it are tilted ........ but I have never ridden it son can't tell you that George had fixed it.. Do a Google Image search.
These are the guys that made sidecar with frame tubes filled with Gasoline!

Ned

We ran one of the first Lola SVs had to do a bunch of things to get it to run and live Ralph had used the VW engine as a stressed member ... when we got it really going it would twist the block and mains would tough the crankshaft. I guess we were faster than Ralph's test driver.

As Smith once said ....it comes from England assembled for ease of shipping.........

 

early GN from Peter M. ...

 

an earlier Clement Bayard discussion on this thread.