AAR test |
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AAR test |
914itis |
Mar 30 2012, 08:22 PM
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#1
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Advanced Member Group: Members Posts: 2,892 Joined: 9-October 10 From: New York City Member No.: 12,256 Region Association: North East States |
I ran the 12v 5 minutes test on my aar. After the 5 minutes, it closes but still allow very small amount of air to go by. Is that normal ?
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Dave_Darling |
Mar 30 2012, 10:32 PM
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#2
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
No "membrane" in the D-jet valve. It has a rotary valve, which is basically a shaft with a hole from one side to the other. The shaft rotates so that the holes through it line up with holes in the housing of the shaft, which makes for a larger opening. Rotate the shaft the other way, and the holes no longer line up so the opening gets closed off, or close to it.
--DD |
Valy |
Mar 30 2012, 11:55 PM
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#3
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Senior Member Group: Members Posts: 1,677 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
No "membrane" in the D-jet valve. It has a rotary valve, which is basically a shaft with a hole from one side to the other. The shaft rotates so that the holes through it line up with holes in the housing of the shaft, which makes for a larger opening. Rotate the shaft the other way, and the holes no longer line up so the opening gets closed off, or close to it. --DD So how do you call that turning thing? |
Dave_Darling |
Mar 31 2012, 01:30 PM
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#4
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
So how do you call that turning thing? A spring? A shaft? Tough to tell exactly what you mean. It sounds like you are thinking of the 1.8's valve, which has a flat plate inside it with a hole in that. The plate gets turned so the hole lines up with the holes through the body to let the air through. The 1.7 and 2.0 (and some 1.8s I think!) have a bimetallic coil spring hooked to a shaft. Heat causes the spring to expand, and since the outer end of the spring is attached to the outside of the valve body and the inside is attached to the shaft through the middle, causes the shaft to turn. (This shaft is about 3/4" thick BTW.) That causes the hole through the shaft to align with the holes in the body. Here's a cutaway drawing of the D-jet version: (IMG:http://www.914world.com/bbs2/uploads_offsite/members.rennlist.com-121-1333222221.1.jpg) Courtesy of Brad Anders' amazing D-jet website: http://members.rennlist.com/pbanders/ --DD |
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