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16-05-2020, 07:42 PM | #16 |
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Join Date: Jul 2003
Location: East London
Bike: Multiple Monsters
Posts: 9,731
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this is the corse breather for 748/9x6 built onto the seat undertray
it’s well over 3 litres (the stock ‘splitter’ on a Monster is a bit under 1 litre) it essentially fills the seat hump. It breathes through a block on the crankcase with no reed valve (restriction). The outlet pipe then runs to the airbox, where a reed valve block lives to stop air being sucked back in, you can see that on the left, just behind the rear throttle body in pic.2 |
16-05-2020, 08:20 PM | #17 | |
Registered User
Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
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Quote:
From the Ducati press release... "The pump is driven by the main oil pump shaft and effectively maintains constant vacuum in the crankcase area below the pistons, reducing atmospheric resistance during the down- stroke of the piston and controlling the internal “breathing” of the engine." Apparently, the pump is an oversized oil scavenge pump which removes much of the air as well as the oil that's drained back into the crankcase. It scavenges air from beneath the pistons and minimises pumping losses. (The pressure is reduced by around 0.7 to 0.8 bar.) I don't know whether this system was used on any other motors or models. |
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17-05-2020, 12:01 PM | #18 | |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,085
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Quote:
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
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25-05-2020, 06:40 AM | #19 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,085
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While I was rummaging through some boxes looking for the old breather box and hoses I came across some NOS DP breather valves which I had forgot I had:-
After I had decided which colour to use. I set about removing all the gubbins required to get access to the valve. Fortunately I had already installed quick release fuel couplings so it was fairly straightforward, the tank could stay on and I just had to unplug the brake light connector and move the brake reservoir out of the way to give a bit more room for maneuvering, as it's really tight in there. There's no room to get a spanner in there to get it undone and it was too tight to undo by hand. I was about to give up and then remembered I had bought some rubber strap wrenches, of the type used to undo jar lids and such. https://www.ebay.co.uk/itm/500mm-Uni...M8amCLhnv6Ij4w These are made for this job, it came undone straightaway and was replaced with the new DP valve. I decided that the gold one looked better than the silver one. I decided against using any sealant on it for now as the plastic ones are prone to leak a bit of oil and I noticed the one on mine had an oring. So will have to see how it fares, with some miles on it. Anyway all buttoned back up, As soon as the correct hose clips arrive, I just need to fit the new hose and filter and decide where it can be routed that is not going to spray oil mist on the back tyre.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
31-05-2020, 04:54 PM | #20 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,085
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I've now routed some hose through from the valve up and backwards into the bike in a similar fashion to the original setup.
And cleaned and re-oiled the K&N filter: - The only issue now is how to fix the thing to the bike. Someone posted before about doing something similar and making a bracket and there was a picture, but I'd be damned if I can find the post now!
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
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