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Also, the intake spends a lot of time with a partial vacuum inside it. With the RTV, you stand a chance of a section of it getting sucked into the intake. For that design, I'd look for a chemical resistant silicon in the shape of a T extrusion. With the cross of the T on the outside, it would hold the seal from being sucked in, and make a better seal when it did get pulled on.
On Tuesday, September 17, 2019, 6:37:58 PM EDT, Charlie England ceengland7@gmail.com <flyrotary@lancaironline.net> wrote:
Le Roux,
There's an old paper on the CAFE web site that talks about exits; they say that a 'bluff body' (what you typically see on the belly of an RV-x), with rounded approaches to the hole, is the most efficient exit method. They talk about gills & say that every blade of the gill adds drag, so it's better to have one opening. I suppose that if the face of the radiator core is close to the gill location, that might change the equation a bit.
You might want to do some research on rtv before using it on the intake. It'll probably work fine, but if there's any chance of gasoline getting on/around it, the gas will attack it. Squirt some out and let it cure completely, then put part of it in some gas, and suspend the rest of it above the gas in a jar, & watch it for a few weeks.
If it were me, there are other sealants I'd choose over rtv for anything around gasoline.
FWIW,
Charlie
Yes Finn : Planned to use rtv with bolts and nuts all around the flange.
Just want to oppened it periodically for inspections when needed.
Yes the flange is also on top as i planned to turn the 13B - 90 degrees ( plugs up) so the intakes stand upright.Then the TB (Throttlebody ) face the inlet duct.Want to make use of the "ram effect " of the incoming air to the TB
and filter.
This makes the hot exhaust easier to exit without complexity in turnes and bends underneath the engine.
Side radiator with "gills" on the side for hot air to exit on the side of the cowl.Think that the "suction effect" of the laminar flo of air over the vents will help with the pressure drop inside the cowl.
Well this is what i planned and want to do..
The proof is in the pudding and must be tested first.
There is always a compromise, if i want to do one thing then must give up on another.
Le Roux
Don't see why it shouldn't last:
1) It's round (assuming end opposite throttle body is a hemisphere)
2) Fiberglass doesn't fatigue like alum, right?
Weak point would be at the flange. Are you planning on using RTV or some other adhesive?
I'm at the point where I need to construct the plenum. However the flange moves it closer to the engine. Maybe I can I can put the removable cover on top?
Finn
On 9/17/2019 12:48 PM, Le Roux Breytenbach
breytenbachleroux@gmail.com wrote:
This is my custom intake plenum must still do the 2 intakes from the plenum.
What is your predictions will it last on the rotary pulses ?
8 layers of bidirectional cloth the "pipe"
On Fri, Sep 13, 2019 at 10:49 PM Steven W. Boese SBoese@uwyo.edu
<flyrotary@lancaironline.net> wrote:
The images show the intake parts used for the tests in the previous message.
Steve Boese
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