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hagargs(at)earthlink.net
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 Posted: Mon Jun 12, 2006 3:57 am Post subject: Cooling mods N40SH |
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The modifications for cooling are nothing earth shattering just what people have been doing for awhile. There are several and the incremantal changes add up resulting in increased overall effectiveness
Nostril intakes up front: These have been made oval by extending them inboard about an inch and a half. Generous lead ins in the inside all around have been made to avoid having the air spill over a sharp edge. Now when you look in from the front you see lots of cylinder fins instead of mostly exhaust header pipes.
Large front cooling intake: Smooth transition on inside front edges on bottom and both sides to avoid having air spill over sharp edges. Rubber flap gasket along top edge against top ramp surface.
Heat exchangers: Oil cooler offset down below water cooler rather than fully behind water cooler. Sheet metal covers over the sides of the coolers so air cannot get around sides. Small sheet metal ramp on bottom of cowl that comes up to the bottom of the oil cooler, so air cannot get by the bottom. Sheet metal diverter flap attached to the botom of the water cooler so that air does not selectively go to it. Allows more air to oil cooler. Air ratio can be modulated by bending up and down.
Exit duct at back down below: This has been opened up by making a large V notch to allow air spilling off the engine up above to more easily get out.
Gill vents: These have been left closed except for the last slot. Its better to have the air going over the engine and down rather than out to the sides at the top,
My battery is on top of the left footwell and it has a large sheet metal heat shield / air diverter on the side toward the engine the hope is to keep the battery cooler and keep the cooling air closer to the engine rather than along the outside walls of the cowl.
Be advised the plane hasn't flown yet. However it is going to be over a hundred degrees for the next three months so all flights will be cooling tests. The taxi tests have been promising though.
Steve Hagar
hagargs(at)earthlink.net (hagargs(at)earthlink.net)
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Dave Miller
Joined: 10 Jan 2006
Posts: 51
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| Posted: Mon Jun 12, 2006 8:12 am Post subject: Cooling mods N40SH |
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The modifications for cooling are nothing earth shattering just what people have been doing for awhile. There are several and the incremantal changes add up resulting in increased overall effectiveness
Be advised the plane hasn't flown yet. However it is going to be over a hundred degrees for the next three months so all flights will be cooling tests. The taxi tests have been promising though.
Steve,
Hope all goes well in this rather nerve wracking part of the project.
Meanwhile, in the more temperate North, I'm finding that in cruise, the oil and coolant temps on my 912S are too low.
Anyone else find this is the case ?
Dave A061
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