Catch Cans for the V2
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I would not install a catch can. I think you're better off finding why its dripping gas from the overflow line, and verify that's where its coming from.
There's plenty of guys here that have removed the EVAP canister on a Ducati and don't have gas puddles everywhere.
There's plenty of guys here that have removed the EVAP canister on a Ducati and don't have gas puddles everywhere.
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I have a similar issue on my 899. I've been looking around online and the best looking catch can I found is the RaceTechTitaniumCoolantTank
I know it's for coolant, but don't see why it couldn't be used for fuel
I know it's for coolant, but don't see why it couldn't be used for fuel
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Thanks for your feedback, @bp_SFV4. In this case, I know why it is leaking. Fixing the issue requires purchasing a Honda and selling the Ducati.
The gas tank design and high heat of the V2, combined with aggressive riding and a hot environment creates a scenario for fuel to be pushed out the tank lines. Some owners have reported finding large amounts of gan in their charcoal canister upon removal. I also found a large amount of gas in my charcoal canister (and then on my jeans) after removing the evap can from my stock V2, which indicates the bike spits gas often. A gas-filled canister is one reason these bikes have hot start issues. Filling the tank to a lower level helps. To be clear, gas only leaks out after riding. No fluid comes out if I fill the tank and don't ride the bike, or if I ride carefully (no wheelies or hard acceleration and stops) with little to no stops at long red lights.
My cafe racer and XDiavel do not have the same issue (evap cans also removed), but they do have completely different tanks.
So ultimately I am looking for a catch can.
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Considering my 1199, Streetfighter V4 and Panigale V4S didn't leak gas all over the place after removing the EVAP canister, a trip to the Honda dealer might be your best route.
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I’m getting the sense that the V2 is not for you. Also, stoppies and wheelies aren’t helping your issue.
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LOL, well the 2021 V2 has changed their ECU (at least the EPROM), and wheelies are not allowed above ~2 feet (even with 100% of the electronics turned off - fully tested). So the wheelies are the full-throttle pulls in first gear and some second gear accelerations over crests while running in DWC level 1 and the wheel goes up about 2 feet. In other words, running the bike at full throttle in race mode like it was designed. I don't do stoppies, but I do brake hard and wiggle the rear, and sometimes lift it a few inches. Again, riding it the way it was designed to be ridden. A catch can is required for the track (for many club track days) and my Duc spits gas when the tank is more than 1/2 full and ridden hard.
Many people don't have this issue and don't ride as I do. Many Duc owners do have this issue and also ride as I do. This is a simple issue and has a simple solution, so I thought I would reach out to see what catch cans people have used on the V2 and to see what creative places they have mounted them. I am not looking for advice on getting a new bike (my Honda comment was obviously a joke). After nearly 30 years of riding, I know when a bike is or is not for me, LOL.
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Many people don't have this issue and don't ride as I do. Many Duc owners do have this issue and also ride as I do. This is a simple issue and has a simple solution, so I thought I would reach out to see what catch cans people have used on the V2 and to see what creative places they have mounted them. I am not looking for advice on getting a new bike (my Honda comment was obviously a joke). After nearly 30 years of riding, I know when a bike is or is not for me, LOL.
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You have more than one post where you .... on your V2...IDK man.
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I’m getting the sense that 0260n25 may be Don14R reincarnated
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@bp_SFV4 please try to be constructive here. I have asked for support on getting new springs because I need them. Lots of people need to adjust their springs (but may simply not do it). I need a catch can for the fluid. I don't believe asking the community for advice on springs and catch cans is shitting on the V2. On the contrary, I love the V2 and asking for advice on how to tweak things means I care enough to make it an even better bike for me. Maybe you misread my posts, but I have not said negative things about the V2. I wish it would wheelie more, but it is what it is.
Also, I am highly educated and not prone to rant or try to cause issues like Don, who I have blocked. Maybe you and @rac1ngsnak3 could help me understand what post makes you think I want to cause issues or hate the V2.
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Thanks, DCPanni. I believe the gas is leaking during the ride rather than after, so it may help for anything that could get pushed out due to expansion after stopping, but may not prevent the issue. I also would like to see just how much is leaking out, so a catch can will help me understand what level to fill up the tank for less leakage (if there is an optimum level). I will continue to fill up with less gas in the tank to help inform my path forward and look into a small catch can. I placed a Denali air horn in the same spot as the EVAP canister (perfect fit), so I will need to find a new location for the can. There is not much room on the V2 for "extras".
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The EPA will hate you for it but you could always give what I did a shot. Basically I connected both the overfill and vaccum lines with a Y splitter, then ran the single line to an overflow bottle. If the tank gets over pressurized, it peepees into the bottle. When the tank pulls a vaccum, it sucks whatever is in the bottle back into the tank first.
Overflow bottle is 250ml for me (what is required by most orgs if you're racing I believe) so it would be worth checking after every ride just to make sure it isn't about to overflow. It's nothing fancy, just a plastic bottle. Mounted it in the nose of the bike and ran the hoses up and out to it. The only pic I have is of a very early mock-up version. I switched to a different type of hose and fittings, but the concept is the same. Not sure where they are located on the V2 tank, might have to get creative.
Overflow bottle is 250ml for me (what is required by most orgs if you're racing I believe) so it would be worth checking after every ride just to make sure it isn't about to overflow. It's nothing fancy, just a plastic bottle. Mounted it in the nose of the bike and ran the hoses up and out to it. The only pic I have is of a very early mock-up version. I switched to a different type of hose and fittings, but the concept is the same. Not sure where they are located on the V2 tank, might have to get creative.
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Under what circumstances would the tank pull a vacuum through its vent port? Or are you using the vacuum line which comes off of the throttle bodies?
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Thanks, @MaverickiB . The evap and overflow hoses are at the front and right side of the V2 tank and run down the right side of the radiators. I have them in a Y connector that goes to the single hose and nipple at the tip of the faring under the bike just behind the front wheel. I had not thought about connecting the catch can in a way that will suck it back to the tank (although everything would need to be clean, LOL - no gunk from a cheap hose). I have the TB hose blocked off and I thought that was the only way to get a vacuum.
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That is what I was wondering.
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IIRC the way things are set up by OEM is one exit is overflow with a check valve (out only) at the end. Also one in the gas cap sometimes, though I believe Ducati removed that per a recall on the V4. Usually terminates out the bottom of the belly pan.
The other goes to the EVAP system and can go either way. If the tank is pressurized, the gas goes through the charcoal filter before venting to atmosphere. If the tank is under vaccum (happens naturally, as gas is uses then air must replace it) then it pulls air the opposite way through the same charcoal filter. When the filter gets oversaturated, the bike can run poorly either because it cannot vent pressure through it, or because it can't equalize vaccum through it. It's less common that an overpressurized tank, but in the early days of my V4 before the EVAP was removed, my cap was extremely difficult to open due to the tank being unable to equalize the vacuum. Made a big whoosh noise when I finally pried it open.
The OEM EVAP system also has a line with an electronically operated valve (Ducati calls it a purge valve) that opens when the bike is started and attempts to pull fumes/gas from the charcoal canister for ignition. Sometimes a fully flooded canister can cause starting issues because it's pulling straight gas into the cylinder instead of fumes, running way too rich. That one is usually just plugged with a bolt or something when the EVAP is removed. I went further and individually plugged each cylinder nozzle at the motor to get rid of as much unnecessary tubing as possible.
Those 4 capped off lines actually converge into 1 which becomes the hose leading to the purge valve on the V4.
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Ah, I forgot about the pull for air when gas is used up in the tank. Some catch cans are quite complex and include K&N style open-air filters, depending on what you are catching/breathing.
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I just don't know how much vacuum the tank's vent line would generate considering the fuel in the tank is also generating fumes which are being vented. I suppose it would albeit maybe a very mild one.
I normally remove the vacuum line leading to the EVAP and plug the ports at the throttle bodies with some stainless bolts, leaving the copper washers in place. I haven't done so yet on the V4S since I haven't taken it that far apart yet. I likely will if I do an exhaust, but that's more of a winter project.
I normally remove the vacuum line leading to the EVAP and plug the ports at the throttle bodies with some stainless bolts, leaving the copper washers in place. I haven't done so yet on the V4S since I haven't taken it that far apart yet. I likely will if I do an exhaust, but that's more of a winter project.
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