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1. 09:45 PM - Re: Vertical or horizontal induction (richard martin)
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| Subject: | Re: Vertical or horizontal induction |
--> RV8-List message posted by: "richard martin" <martin333@athenet.net>
Shane,
Neither cowl version will give you much of a speed improvement.
If you wish to go faster, consider the Sam James Cowl aka "holy cowl or NACA
cowl" with a plenum chamber also from Sam James. Use a fuel injected engine
with a forward facing horizontal induction. This combination will yield a minimum
speed increase of 10 mph and also a boost in manifold pressure of 1 to 2 inches
depending on temperature and altitude. Also, this combo will substantially
improve both oil cooling and CHTs. Oil cooler should be intalled on the rear
of #3 cylinder tilted down approx 25 degrees. DO NOT USE a Positech oil cooler
on this installation. I tried one and had very bad results. (inadequate cooling).
I used a NIAGARA 10 row cooler. If you are using the 180 hp version, the 9
row cooler should be large enough. I would also suggest that you seriously
consider a Lightspeed electronic ignition. It will save you up ;to 5% in fuel
consumption, and will give you a boost in power. HOT starts are a non event
with a Lightspeed.
Go Faster.
Dick Martin
RV8 N233M
the fast one
>
>Dear friends,
>
>My Father and building partner are clipping along on our fuselage and
>have ordered our finish kit recently. We have not yet bought a motor
>but we are considering the superior xp360 injected version. It is a
>parallel valve with a vertical induction. My question is how much
>drag does the chin scoop create with the vertical induction?
>Does the slight boost from the ram air on a chin scoop version outweigh
>the lack of drag from a non chin scoop cowl that is used with horizontal
>induction? Does anyone have any hard numbers to compare the 2 cowl
>versions?. I think the xp360 can be converted to a horizontal draft
>induction but is it worth the bother? Any comments would be
>appreciated. The bottom line is given the same motor which cowl is
>faster, chin scoop or non chin scoop?
>Shane Summerhays
>Salt Lake City Utah
>Flying rv6
>Fuse rv8
>
>
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