Catch Can & Check Ball Nonsense

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BP PanigaleV4S

BP PanigaleV4S

Joined
Jul 10, 2020
Messages
6,075
Location
Midwest
What are you track guys doing for a catch can? While I'm just on the street for now, I noticed under hard braking I get a nice puddle of gas under the bike, which I'm not a fan of. In a thread on the Ducati Modified site, someone suggested putting the 4.5mm check ball back into the gas cap, which was removed for a recall, would help. But after testing that out I don't think it does. However, it does help with keeping the fumes at bay when you return from a ride and the bike it still warm. When the check ball was out, you could look under the bike and see the fumes pouring from the hole in the lower fairing the hose goes to. Not ideal, they are gas fumes after all.

I came across this setup on Yoon Racing's YouTube channel. Seems super simple, but I'm having trouble locating where to buy the bottle. If you Google catch can, you get a .... ton of results for oil catch cans for all of those owners of direct injected turbo cars.

1652214154833.png
 
Why the hell is all that nonsense? Who works on these things without getting a migraine. What a mess
 
Mick1976 said:
What are all them hoses and lines?
Click to expand...

Not sure if you're being sarcastic, but if you aren't:

There's one from the secondary coolant overflow tank into the catch can. One from the secondary coolant overflow tank that runs through to the main coolant tank on the right side. The other line running into the catch can is the gas tank overflow. The big line running all the way from the top left to the bottom right is the hydraulic clutch line.

I completely eliminated the secondary coolant overflow tank on my bike. It never came with one originally, and was added as an early TSB. I believe people were overfilling coolant in the main tank because it isn't as translucent as it originally appears. Ducati decided to add another tank and a mess of hoses to alleviate dumb owners. I've never had a drop of coolant come up and out of the main coolant tank. It doesn't even get close to getting that high.
 
I didn't know that second coolant overflow was added later. Makes sense though.

With the massive race radiators that space and the similar one on the other side are used for additional radiator. I can't imagine a sideways mounted radiator makes that much of a difference.
 
But to put the overflow from the 2e overflow cooling reservoir in a extra tank together with the gas overflow?????
 
I don't think it matters. Both lines would normally just go to the lower fairing and dump on the ground. The catch can just keeps it from going on the ground.
 
It's also because most racebikes have/are required to have racing belly pans that can contain at least the amount of oil in the motor. Having a gas overflow run off into the belly pan where a bunch of hot bits like the exhaust exist is a recipe for disaster. Coolant makes a lot of smoke when it burns so it could cause a premature fire response as well. So it makes sense to require a catch can for those fluids.
 
Ok, so I’m a ....... ..... for asking but why in the hell are these bikes “venting” anything but vapor? If your legitimately leaking oil, water or fuel, on a regular basis you need to get someone who knows what they are doing working on your bike.
 
Slightly insulting but I’ll drive past that.

I’m not the only one that after the canister removal and/or full system install that has a problem with fuel sloshing forward on hard braking and making it into the overflow.

Maybe it’s not an issue on the xx99/V2 because the tank has a much different shape.
 
I’m slightly insulting before I even get started so don’t take offense. I ran a full HRC kitted 1000RR (stock tank and Ladybird endurance tank) for a couple of years back in the day and have built I don’t know how many other track bikes other than Ducati and have never leaked anything. I’m pretty sure designed, assembled and set up correctly, the bikes are not supposed to spill their life fluids into a plastic bottle. On an oddball occasion I can see the coolant might vent but that never happened to me on any bike.

If I did have a bike that did that, I would probably be on a mission to remedy that. Currently I run the stupid little can H2O supplies. It’s never had anything in it. I run a tank vent line to the ground and I don’t run an air box vent line. I have never leaked a drop of fuel or oil into the box or anywhere else.
A75EB7FB-DDB6-4CEA-B525-A2786701C2C7.jpeg8F97936D-36F6-49D3-91AC-F3D167E1D699.jpegBE208801-E418-451B-B1AA-CEC75B7F77CD.jpeg
 
endodoc said:
Ok, so I’m a ....... ..... for asking but why in the hell are these bikes “venting” anything but vapor? If your legitimately leaking oil, water or fuel, on a regular basis you need to get someone who knows what they are doing working on your bike.
Click to expand...
My bike has leaked a drop or two of gas after hard riding ever since I brought it home brand new. I've had multiple dealers and techs look at it with no explanation other than "maybe change the gas cap."
 
Arod96 said:
My bike has leaked a drop or two of gas after hard riding ever since I brought it home brand new. I've had multiple dealers and techs look at it with no explanation other than "maybe change the gas cap."
Click to expand...
Absolutely typical from a Duc shop. “It’s a Ducati, it’s supposed to leak” nonsense. Look I’m maybe being a bit ....... but when I see 40k bikes with rubber hoses, plastic T fittings and plastic bottles from ACE hardware it’s ....... embarrassing.

Maybe this board needs a “builders workshop” or something because the quality of craftsmanship and attention to detail and preparation on some of these builds is pretty ....... bad. If you don’t know how to build or mod it correctly, ask, there are guys on this board and elsewhere that do. There are some good builders on Ducatimodified as well who take pride and the time to do things correctly.
 
endodoc said:
I’m slightly insulting before I even get started so don’t take offense.

If I did have a bike that did that, I would probably be on a mission to remedy that.
Click to expand...

That's why I didn't push it. I have a feeling when someone is being brash vs being a .... on purpose.

I am on that mission. I really think the fuel tank need more baffles (read manufacturing cost) in it. There's foam, but that's a less elegant solution.

This tank shape...has a lot of fluid moving forward. The forward portion is so thin, when you see an underside pic you realize how little volume is there.

1652318237093.png

This, not as bad.

1652318287051.png

Ducati treats these bikes like Moto GP prototypes. Release it into the wild, fix the issues next year.

I should add, there was a lot of hardware that was removed from the V4 gas cap. The 18 models had the check ball, and a spring with a plate. IMO, all of these things were deleted to address the problem of the tanks getting heat soaked and boiling the gas to a point of vapor lock. Deleting the EVAP solved the vapor problem, but DNA can't really suggest that. They (DNA) could also change the parameters by which the valve on the EVAP canister activated, but that would push them outside of emission requirements as the bike would run rich at idle and low RPM, where its tested. No emission test is sniffing at 15k RPM, but at much lower ones.
 
Last edited:
The Tank on the HRC bike (it was either Ladybird or Spiral Spinner) had a top vent line that I just ran down the triple. It had an internal one way check valve. Never wet the line. It didn’t even leak when I crashed it and that was a giant gas tank
4603E5F4-4CCC-4C3B-ACC5-7C2975695ED3.jpeg
 
I've never had a drop of fluid exit any of the overflows on my V4. I get it being required by some racing orgs for safety (why I did it) but I believe it is unnecessary.
 
endodoc said:
Absolutely typical from a Duc shop. “It’s a Ducati, it’s supposed to leak” nonsense. Look I’m maybe being a bit ....... but when I see 40k bikes with rubber hoses, plastic T fittings and plastic bottles from ACE hardware it’s ....... embarrassing.

Maybe this board needs a “builders workshop” or something because the quality of craftsmanship and attention to detail and preparation on some of these builds is pretty ....... bad. If you don’t know how to build or mod it correctly, ask, there are guys on this board and elsewhere that do. There are some good builders on Ducatimodified as well who take pride and the time to do things correctly.
Click to expand...
Oh trust me I agree. I’ve heard the age old “It Italian it makes weird noises and leaks a few things don’t worry.” It gets old because it shouldn’t be that way. It is definitely annoying littering my garage with drops of fuel but I haven’t been able to figure what is causing it or what to do to stop it. I’ve tried filling the bike up to different levels of “full”. Tried leaving the gas tank cap open when I park it. Doesn’t matter it leaks a drop or two out the drain hose on the kickstand side and then just stops
 
MaverickiB said:
I've never had a drop of fluid exit any of the overflows on my V4. I get it being required by some racing orgs for safety (why I did it) but I believe it is unnecessary.
Click to expand...

If you have a 2018, all of the valving/check ball nonsense is still installed in the gas cap breather assembly unless you had the recall done. Even if you replaced the stock cap the breather assembly is reused.

None of these parts except for the red plastic piece are present on my 2021.

1652359694622.png
 

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