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1. 03:49 AM - Re: Re: Engines-List Digest: 1 Msgs - 10/05/04 (Bill Maxwell)
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| Subject: | Re: RE: Engines-List Digest: 1 Msgs - 10/05/04 |
--> Engines-List message posted by: "Bill Maxwell" <wrmaxwell@bigpond.com>
Hi Archie
I would be interested in that CAD diagram too, if possible please.
Bill
----- Original Message -----
From: "Archie" <archie97@earthlink.net>
Subject: Re: Engines-List: RE: Engines-List Digest: 1 Msgs - 10/05/04
> --> Engines-List message posted by: "Archie" <archie97@earthlink.net>
>
> > Archie,
> > This static boundary layer thing- I've heard of this before,(normally in
> > the
> > context of airframe surfaces esp. airfoils) and can picture it easily
> > enough- like the dust that refuses to fly off my old truck at highway
> > speeds. I do believe you, but it still sounds funny to the me. Kind of
> > like
> > how a golf ball flies farther because of its dimples. We know it does,
> > just
> > "doesn't seem right!" Very interesting stuff. Bottom line- a properly
> > calibrated and operated flow bench does not lie.
> >
> > So this detrimental effect, just how significant is its penalty? I'm
> > imagining it to be in the neighborhood of being almost an even wash;
does
> > this amount to a bunch of work for nothing?
> >
> > Stu Bryant
> ===============================================
> On a slow turning, high displacement engine, (such as aircraft), velocity
> improvement of the intake charge seems to be the most effective.
> I have also found that in some instances dimpling with a prick punch
> on the long side intake radius induces enough turbulence to keep the
> fuel mixture from coming out of suspension.
> The intake ports are treated with a coarse blast of abrasive when the
final
> port shape is completed. The exhausts are very smooth, and semi-
> polished, as is the combustion chamber to help prevent carbon buildup.
> The most effective exhaust shape is a "D" shape, with the straight part
> of the D being bottom horizontal. (or the short side radius)
>
> We would ideally love to have a straight shot in and out, but if you
> compare late automotive engines to this, you will see great improvements
> in comparison, that the AC In & Ex charges must run.
> For the most part, (there are exceptions), the short turn radii are not
> modified as much as the long.
> Transitions, such as the pipe attachments, etc, are slightly enlarged in
> the direction of flow, to eliminate reversion.
> If you have CAD on your computer, I can send an illustration via a
> .dwg file.
> Archie Frangoudis,
> Archie's Racing Service
>
>
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