Wildguzzi.com
General Category => General Discussion => Topic started by: Bonaventure on November 28, 2017, 04:26:33 PM
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Sounds like a fog horn waaaaay off in the distance and very faint, I guess it's the fuel pump pressure equalizing? It has to do with the engine radiating heat up and around the tank and causing a temperature induced change in vapor pressure inside, is my guess. It will sit and do this until it cools down. Rate of about, I don't know, maybe 1 per minute. Duration maybe 2 or 3 seconds. Certainly adds some personality to the beast !!
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Mine does it too. Apparently very common for Guzzis.
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Tank pressure venting.
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Yup .............. pressure relief.
All my 8Vs do it to a degree but not so for the others?
Ciao
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My V7 does it too.
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It's the fuel evap system. There are several threads on how to eliminate the charcoal canister and check valve contraption. I removed mine on the Norge & Griso. Jury is out on any performance gains. I noticed an immediate change in a more stable idle, and maybe a small improvement in throttle response, but not much. Of course now the fuel tank vents to atmosphere.
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^ I did the same with my Norge. No more groaning, at least not from the bike!
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From a B1100 manual. Examples of Euro vs USA tank venting.
(http://thumb.ibb.co/bzzh5G/Slide1.jpg) (http://ibb.co/bzzh5G)
Euro venting to atmosphere
(http://thumb.ibb.co/iJ1Jeb/Slide2.jpg) (http://ibb.co/iJ1Jeb)
USA venting thru carbon canister.
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As long as the canister system is working right, I'll probably keep it intact. :cool:
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The charcoal canister on a former BMW 7 Series went bad from gas pump jockeys over-filling the tank. (In nanny-state Oregon, we are not allowed to fill our own automobile gas tanks.) It cost nearly $1,000 to replace it. Fortunately, Kuni BMW took care of it for me. Just a cautionary tale about charcoal canisters...