sqeeezy
Well travelled
- Location
- Southern Spain
Not too hot today so I went for a blat up the other mountain and back home again.
Inspired by reading stuff about EVAP on the other forum, and feeling guilty cos I hadn't checked it since I dumped it in red clay mud in Morocco, I dropped the sump guard and had a look at the mess of tubes and stuff, with a view to cleaning it up, removing insect cocoons and generally getting my head round how it works. I'm a tree-hugger and I like this planet (Hell, it's the only one with bacon and chocolate on it! ) so I'm into clean air for my kids and their kids etc., so I'm not going to rip it off just because I can't understand it.
So..no mud found, no insect cocoons,
blew threw tubes and t-piece ok,
blew through petrol tank vent line with tank open and then with tank shut (verifies tank cap seals ok and gives you a funny feeling in your ear),
blew through purge valve from petrol tank vent connector to canister loopback hose connector and got it to open with a slight jokey trumpeting note (the 3rd line on the purge valve reacts to suck and blow as if there's a small diaphragm-like movement inside, but no air flow).
So the charcoal canister is venting to the air of my favourite planet with the short siphon shaped hose stub; what's that about?:
all three lines on the canister freely communicate with each other...odd...
The throttle body line connects to the T-piece, yeah?,
and the T-piece connects to the canister,
so how can the throttle body vacuum open the purge valve if it's able to suck fresh air in via the T-piece/canister/canister air vent.
Isn't that like "short-circuiting" the vacuum?
I'm obviously missing something.
I'll paste the bit from the BS4 Vehicle Service Manual which could profit from a native English-speaking proof reading. Here for what it's worth:
The purge valve is a mechanically controlled one way valve. When the engine is off, the purge valve is closed. When the engine is started, the vacuum created in the suction port is used to open this one way valve and allow the vapors to go into the inlet port.
The Evaporative emission control system EVAP fitted in our motorcycles prevents gasoline vapors from escaping into the atmosphere from the fuel tank.
As soon as the motorcycle is parked after riding or parked under the sun, the hot radiation from the engine / sunlight causes the fuel in the tank to warm up and releases fuel vapors.
The EVAP system prevents these fuel vapors recycled to engine to avoid vapor into the atmosphere and stored in a charcoal canister.
As soon as the engine is started. these vapours are purged from the canister, into the combustion chamber. The system consists of a canister, purge valve, rubber hoses, connectors and a sealed fuel tank cap.
To put it in perspective: I love the bike: it gives me chewing-gum jaw from grinning too much. This EVAP stuff is just me trying to understand it: I'm not whingeing.
Happy Trails, team!
Inspired by reading stuff about EVAP on the other forum, and feeling guilty cos I hadn't checked it since I dumped it in red clay mud in Morocco, I dropped the sump guard and had a look at the mess of tubes and stuff, with a view to cleaning it up, removing insect cocoons and generally getting my head round how it works. I'm a tree-hugger and I like this planet (Hell, it's the only one with bacon and chocolate on it! ) so I'm into clean air for my kids and their kids etc., so I'm not going to rip it off just because I can't understand it.
So..no mud found, no insect cocoons,
blew threw tubes and t-piece ok,
blew through petrol tank vent line with tank open and then with tank shut (verifies tank cap seals ok and gives you a funny feeling in your ear),
blew through purge valve from petrol tank vent connector to canister loopback hose connector and got it to open with a slight jokey trumpeting note (the 3rd line on the purge valve reacts to suck and blow as if there's a small diaphragm-like movement inside, but no air flow).
So the charcoal canister is venting to the air of my favourite planet with the short siphon shaped hose stub; what's that about?:
all three lines on the canister freely communicate with each other...odd...
The throttle body line connects to the T-piece, yeah?,
and the T-piece connects to the canister,
so how can the throttle body vacuum open the purge valve if it's able to suck fresh air in via the T-piece/canister/canister air vent.
Isn't that like "short-circuiting" the vacuum?
I'm obviously missing something.
I'll paste the bit from the BS4 Vehicle Service Manual which could profit from a native English-speaking proof reading. Here for what it's worth:
The purge valve is a mechanically controlled one way valve. When the engine is off, the purge valve is closed. When the engine is started, the vacuum created in the suction port is used to open this one way valve and allow the vapors to go into the inlet port.
The Evaporative emission control system EVAP fitted in our motorcycles prevents gasoline vapors from escaping into the atmosphere from the fuel tank.
As soon as the motorcycle is parked after riding or parked under the sun, the hot radiation from the engine / sunlight causes the fuel in the tank to warm up and releases fuel vapors.
The EVAP system prevents these fuel vapors recycled to engine to avoid vapor into the atmosphere and stored in a charcoal canister.
As soon as the engine is started. these vapours are purged from the canister, into the combustion chamber. The system consists of a canister, purge valve, rubber hoses, connectors and a sealed fuel tank cap.
To put it in perspective: I love the bike: it gives me chewing-gum jaw from grinning too much. This EVAP stuff is just me trying to understand it: I'm not whingeing.
Happy Trails, team!