Do you disconnected your breather hose to air box?

Woe unto you that bought the first model year of a major remake, perhaps this section can help address any 2014 and later model Ural "imperfections". Here's a special section for folks with the latest rigs to discuss 2014 and later model-related topics such fuel injection, 3-wheel disc brakes, hydraulic steering dampers, spin-on oil filters and other anomalies that don't belong on true Russsian motorcycle ;-P We've gone from using big hammers and greasy wrenches to needing computers and Ouija boards in order to fix our rigs.
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Please keep this section specific to issues pertaining to 2014 and later models such as fuel injection, sidecar and rear disc brakes and so forth. Ask general or non-2014 and later specific questions in the main Hammerin' & Wrenchin' section.
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Re: Do you disconnected your breather hose to air box?

Post by gobium » Tue Nov 14, 2017 2:24 pm

Imwa did the T on purpose

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Re: Do you disconnected your breather hose to air box?

Post by Mr Wazzock » Tue Nov 14, 2017 2:40 pm

Which incidentally is identical to what's in a 1983 R80 (as I had). :D
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Re: Do you disconnected your breather hose to air box?

Post by Tomcatfixer » Tue Nov 14, 2017 2:45 pm

Consequently some oil loss is liable to occur at 60 mph and over.
I routinely ride my cT at speeds between 60 and 70mph. Perhaps this is why I previously suffered a wet air filter, while so few others seem to share my experience.
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Re: Do you disconnected your breather hose to air box?

Post by Mr Wazzock » Tue Nov 14, 2017 2:47 pm

Quite possibly - having done a bit of 60+ in recent months, is why I'd like to look inside mine again - when the opportunity arises :D
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Re: Do you disconnected your breather hose to air box?

Post by gobium » Tue Nov 14, 2017 2:56 pm

One way or another
We will settle this myth.
I will talk to Ilya and Iribit engineer guy , bob will talk to another ural Engineer

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Re: Do you disconnected your breather hose to air box?

Post by Mr Wazzock » Tue Nov 14, 2017 3:07 pm

Well what is certain is it goes by hose into air filter box because we are not allowed to dump it on the road any more - which is where it would go otherwise :D

Altho there is a small drain hole in back of filter box so can still be true.
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Re: Do you disconnected your breather hose to air box?

Post by Manscout » Tue Nov 14, 2017 5:10 pm

I have to say that you will get an over-oily air filter if you overfill your engine oil. At sustained RPMs, you will get a lot of blowback through the breather hose. But most of you know that.
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Re: Do you disconnected your breather hose to air box?

Post by :FI:Igor » Tue Nov 14, 2017 7:09 pm

Stock paper air filter, breather tube connected/normal. No oil on filter. 27,000 km, inspect cleaner per PM schedule.
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Re: Do you disconnected your breather hose to air box?

Post by Burt1713 » Tue Nov 14, 2017 7:30 pm

I am keeping the crankcase vent connected to the air box, with the addition of a catch can. I like the idea of keeping the crankcase pressure as low as possible, but I don't like the liquid (water, oil , cappuccino, spudge, etc.) getting on the sensors in the throttle bodies.
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Re: Do you disconnected your breather hose to air box?

Post by GHGoodwin » Wed Nov 15, 2017 8:40 am

Agree with Burt. The first time I serviced my '14 andwent to install a K&N there was a line of spurge flowing into the left TB. I was concerned it might get into the TB vacuum sensor opening so I disconnected it and routed the vent line elsewhere.

An idea inside a joke - Intake of spurge lowers combustion temperature. Intake also retards advancement of flame front and helps prevent detonation. Either way with spurge being mostly water carried in a hydrocarbon complex we can finally say we have water cooled engines. :roll:
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Re: Do you disconnected your breather hose to air box?

Post by rougaroo » Wed Nov 15, 2017 9:48 am

Couple of things:

Mr. Wazzock said:
Well what is certain is it goes by hose into air filter box because we are not allowed to dump it on the road any more - which is where it would go otherwise :D
Which would make sense in a regulatory compliance-driven world, except why would Dnepr go to the trouble and cost of designing and manufacturing an exhaust gas recycling system when it existed in a world that included the Lada and Trabant (i.e. no regulations enforced, clouds of exhaust)?

Water gets into the oil when the engine cools or when condensation forms on the inside of the crankcase. That water boils off when the engine heats up over 212F/100C, which is the cappuccino-like froth we’ve been describing. After your engine is fully warmed up, there shouldn’t be any water left in the blow-by. As Chad has experienced, maybe you get more oil mist if you’re running hard at 65+ mph - or (in his case :lol: ) flying the chair a lot - but most folks don’t seem to have a lot of fouling running moderately on the level.

Maybe I’m just a contrarian, but I suspect a reason beyond compliance for recycling the blow-by gasses. Look at all the SS folks who add Marvel Mystery Oil to their gas. What’s their claim - top end lubrication, early oil to the piston during warmup, etc. isn’t the same function served by recycling the blow-by to the intake? And back in VW days we used to do a thing called the “Italian valve job” where you’d get the engine hot, remove the intake manifold, and spray water mist into the carb throat while revving the engine to keep it from stalling. Clouds of carbon smoke would usually blow out the mufflers as the carbon was steam cleaned from the valves and piston tops. Aren’t you doing essentially the same thing burning off the water in the recycled blow-by?

Wish there was a way to find out from the Ural designers why they incorporated this in the design. Believe me, I really understand and sympathize with the argument that engines have been burdened with compliance-driven widgets that reduce mileage, hinder performance, and add cost. But this blow-by thing makes me suspect the Ural design engineers had something else in mind.

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Re: Do you disconnected your breather hose to air box?

Post by Peter Pan » Wed Nov 15, 2017 10:40 am

Perhaps the Italian valve job in homeopathic dosis.
In fact I observe lots of carbon on valves and piston top.
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Re: Do you disconnected your breather hose to air box?

Post by Red Dwarf » Wed Nov 15, 2017 3:18 pm

rougaroo wrote:Water gets into the oil when the engine cools or when condensation forms on the inside of the crankcase. That water boils off when the engine heats up over 212F/100C, which is the cappuccino-like froth we’ve been describing. After your engine is fully warmed up, there shouldn’t be any water left in the blow-by.
Not much anyway.
Water is a combusion by-product.
It is always in blow-by--assuming the ignition is working.
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