SuzukiSavage.com - Breather Blues

Armen Serious Thumper Offline Half-Witted Wrench-Jockey from Jersey Posts: 1431	Re: Breather Blues Reply #60 - 10/28/19 at 19:54:07 Thanks for the info on the Krank Vent. Just ordered one. It'll take less effort than making my Duc one fit.
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DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 4166 Honolulu	Re: Breather Blues Reply #61 - 10/29/19 at 13:11:19 The copper gasket was like $15 Armen. There are some interesting tidbits related to that Hayden vent. I don't know if the other forum members have any interest in the KrankVent nitty-gritty. If you want, I can elaborate on the key points here in this post, or I can eMail you the details and pictures. LMK
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Armen Serious Thumper Offline Half-Witted Wrench-Jockey from Jersey Posts: 1431	Re: Breather Blues Reply #62 - 10/29/19 at 17:25:56 Thanks DBM! Why don't you go ahead and post the Krank Vent info? Worst case scenario is that someone doesn't read it.
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DragBikeMike

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Re: Breather Blues
Reply #63 - 10/30/19 at 03:07:52

OK. Here goes. Try not to fall asleep.

I had one of these gizmos years ago. It was on my old Harley Evo engine. The two halves of the assembly fit together very tight. The one I received recently (for the Savage) was loose. It didn't fit together tight. There was a gap between the two halves, and you could wiggle them around. See the big gap.

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DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 4166 Honolulu	Re: Breather Blues Reply #64 - 10/30/19 at 03:12:15 When I popped it apart the first thing I noticed was this big, fat 1/8" cross-section o-ring. I could also see that the umbrella valve did not contact the seating surface. If you sucked on it hard enough, the umbrella valve would make-up, but it didn't seem right.
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DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 4166 Honolulu	Re: Breather Blues Reply #65 - 10/30/19 at 03:15:20 I dug up some old Harley umbrella valve assemblies from a Twin Cam. Those had umbrella valves that were in intimate contact with their seating surface. I thought the Hayden unit should be set up the same way. See how these Twin Cam umbrellas seat nicely.
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DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 4166 Honolulu	Re: Breather Blues Reply #66 - 10/30/19 at 03:17:47 The Twin Cam engine uses a significantly larger umbrella valve than the Evo, but the concept is the same. It's a check valve that allows air to flow out of the engine but not back in. Here you can see the difference in size between and Evo and Twin Cam umbrella.
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DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 4166 Honolulu	Re: Breather Blues Reply #67 - 10/30/19 at 03:22:17 The Hayden KrankVent uses the smaller Evo style umbrella valve. Awhile back I picked up four of them from Dennis Kirk. I was gonna manufacture my own check valve assembly. As I previously mentioned, I got lazy. If you want some of these Genuine James Gaskets umbrella valves, this is the part number.
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DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 4166 Honolulu	Re: Breather Blues Reply #68 - 10/30/19 at 03:25:19 The Genuine James Gasket umbrella valve fixed the gap between the valve & its seat. The material is softer and more pliable. Simply replacing the Hayden part with the James part resulted in a nice tight fit.
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DragBikeMike

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Re: Breather Blues
Reply #69 - 10/30/19 at 03:30:30

In the previous picture, you can also see that I replaced the big fat o-ring with a 3/32" cross section o-ring. More on that later.

I noticed that there was almost no radial clearance between the housing and the circumference of the umbrella valve. That seemed too restrictive. Note how the edge of the umbrella valve sits almost all the way to the circumference of the seat.

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DragBikeMike

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Re: Breather Blues
Reply #70 - 10/30/19 at 03:41:30

To tighten up the sloppy fit between the two halves of the assembly, and to provide more clearance between the umbrella and the housing, I made a new housing from Delrin. The new housing has a stepped bore.

It overlaps the major diameter of the body (like 1.345") with a push fit. That holds the assembly together while still permitting disassembly for maintenance.

It has a minor bore in way of the new o-ring (like 1.170"). That stabilizes the assembly and gets rid of all the wiggling, and of course provides a nice sealing surface.

And for the remainder of the bore in way of the umbrella valve, its about .050" larger than the original (like 1.255"). That provides additional clearance between the housing and the circumference of the umbrella valve.

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DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 4166 Honolulu	Re: Breather Blues Reply #71 - 10/30/19 at 03:42:15 Here's what it looks like assembled.
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Armen Serious Thumper Offline Half-Witted Wrench-Jockey from Jersey Posts: 1431	Re: Breather Blues Reply #72 - 10/30/19 at 03:42:46 Awesome! Thanks! Just bolts on!
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DragBikeMike Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 4166 Honolulu	Re: Breather Blues Reply #73 - 10/30/19 at 03:43:04 Here's what it looks like installed.
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Armen Serious Thumper Offline Half-Witted Wrench-Jockey from Jersey Posts: 1431	Re: Breather Blues Reply #74 - 10/30/19 at 03:45:01 Very tidy!
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