Crankcase breather relocation, free power! - Page 25 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #241 of 246 (permalink) Old 06-02-2019, 03:03 PM Thread Starter
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You are a lucky man!! I have no choice in the rain and my closest garage is in Portugal, so I have to think of this kind of things XD

Any idea if the Bonneville has a diaphragm before the hose like other bikes? and if they do is it a common occurrence for it to get clogged? finding hard to explain my all over oil leak when the temperature goes up

The breather went through a major change of design in 2006, I think. The one we have now is of the labyrinth separator type with no valves or moving parts at all.
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post #242 of 246 (permalink) Old 06-03-2019, 06:21 AM
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Huummm the plot thickens, something is causing an increase in oil pressure inside my engine. if there are no valves on the breather system since 2006, I should rule out the breather system, but I'll give it a check anyways since I'll be removing it from the airbox

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post #243 of 246 (permalink) Old 06-05-2019, 01:35 PM
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Hello All
I did something different on my 2015 Triumph Thruxton. I decided to utilize the Air Injection system to evacuate crankcase pressure. I removed the AI relay and placed a piece of aluminum tubing I turned on my lathe in place. I disconnected the breather connection to the airbox and plugged the airbox opening, I also plugged the connection on the airbox going to the AI system. I used the hose that came to the top of the airbox after I cut it and using pieces of tubing in two places to get the routing I wanted then using a piece of aluminum tubing I turned on the lathe and I connected it to the breather. I had connected a vaccum gauge to the hose and noted 7 psi of vaccum. The system uses two reed valves one connected to each cylinder head exhaust port to create the vaccum. I have been running the bike but not much it only has 5460 miles on it but I have not noticed any ill effects.Here are some pictures.
Juan

[IMG][/IMG]
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post #244 of 246 (permalink) Old 06-05-2019, 02:44 PM Thread Starter
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Good idea to keep the reed valves there, otherwise the crankcase would have a direct connection to the exhaust ports. Here's a thread with some useful discussion about this method of aiding the breathing:


https://www.triumphrat.net/air-coole...ather-mod.html
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post #245 of 246 (permalink) Old 06-05-2019, 02:59 PM
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Interesting. Do you suppose that both pistons falling together meet a significant resistance, with the crankcase having to breathe thru a small tube? Same goes for the upward movement I guess, they would be be leaving a partial vacuum behind.

This would presumably rob power too.
Proper and efficient venting of the crankcase is always preferred. However, consider that any energy absorbed in compressing the crankcase air on the downward stroke of the pistons in a 360 degree engine is largely returned to the crank on the upstroke as the air, essentially acting as a "spring", decompresses.

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post #246 of 246 (permalink) Old 06-05-2019, 05:39 PM
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Good idea to keep the reed valves there, otherwise the crankcase would have a direct connection to the exhaust ports. Here's a thread with some useful discussion about this method of aiding the breathing:


https://www.triumphrat.net/air-coole...ather-mod.html
Hello Forchetto
I read the posts in the link. I was also a drag racer in the late 70`s and ran a 1971 chevrolet Camaro in the National Hot Rod Association super stock division at the time Moroso racing equipment was selling a crankcase pressure evacuation system which had a couple of anti backfire valves you would weld to the exhaust headers. The valves were connected to the breathers in the valve covers. I did many runs shifting at 8,500 Rpm on my 5.7 liter engine and it never blew a seal or show any sign of leaks that is where I got the idea to use the AI system on my Triumph for crankcase pressure evacuation. The anti backfire valves were just reed valves.
Juan




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