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Author Topic: angle of sprinkler hole-spray in venturi?  (Read 1771 times)

Offline Louis Keller, Jr.

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angle of sprinkler hole-spray in venturi?
« on: October 09, 2011, 12:50:07 PM »
Put some replacement parts in an os 35-s. All is good and it runs great on the bench. Curious though, does the angle of spray into the venturi make a difference in the run of an engine and if so how? I've always kept them pointing down at the same angle of the venturi-carb base. What's best?
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Offline Chris Wilson

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Re: angle of sprinkler hole-spray in venturi?
« Reply #1 on: October 09, 2011, 04:04:49 PM »
Rotate the spray bar so that the hole just disappears from view, that is the region of highest velocity and lowest pressure without suffering from any direct ram air effects.

Having it pointed straight down the throat of the venturi will place it into a turbulent area and may give inconsistent results.
« Last Edit: October 09, 2011, 04:26:40 PM by Chris Wilson »
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MAAA AUS 73427

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Offline scott matthews

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Re: angle of sprinkler hole-spray in venturi?
« Reply #2 on: October 11, 2011, 07:12:37 PM »
After watching this post for 3 days I am assuming that this answer is totally correct? There are no differant opinions?
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Offline Chris Wilson

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Re: angle of sprinkler hole-spray in venturi?
« Reply #3 on: October 11, 2011, 07:55:13 PM »
There are always other opinions mate but please view -
http://www.clacro.de/

Go to 'design/ venturis' and check out sketch 6B.
« Last Edit: October 11, 2011, 08:21:50 PM by Chris Wilson »
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MAAA AUS 73427

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Offline Louis Keller, Jr.

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Re: angle of sprinkler hole-spray in venturi?
« Reply #4 on: October 11, 2011, 08:32:44 PM »
thanks fellas. Great info. will put to practice next session.
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Offline Chris Wilson

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Re: angle of sprinkler hole-spray in venturi?
« Reply #5 on: October 13, 2011, 03:51:58 PM »
This quote sums it up VERY well -

"Using a manometer an an appropriate source of moving air, you will find that when rotating the spray bar in the venturi that draw is essentially constant when the hole is out of sight, and will bump up by about 15% when it is positioned in the exact right spot."

From -

http://controlline.org.uk/phpBB2/viewtopic.php?t=5236&highlight=
(second last post on page one.)

Cheers.

Still learning after 50 years.
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MAAA AUS 73427

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Offline Bill Little

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Re: angle of sprinkler hole-spray in venturi?
« Reply #6 on: November 01, 2011, 10:38:51 AM »
Hi Chris,

Thanks for the info.  For what it's worth, I have always angled it slightly to the rear from vertical, just OOS.  This has always seemed to work great for 4-2 engines.

Big Bear
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Offline Gene O'Keefe

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Re: angle of sprinkler hole-spray in venturi?
« Reply #7 on: November 01, 2011, 12:27:43 PM »
I concur with Bill...to the REAR just out of sight vs rotating it to the front.
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