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| Author |
Message |
    
John Davis
Senior Member
Username: johnny
Post Number: 274
Registered: 03-2006
| | Posted on Monday, March 08, 2010 - 09:58 am: | 
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On these old two cycle marine engines is there any benefit to using a down draft carburetor verses one that attaches straight out of intake port to a check valve? Seems like I see a lot of the engines changed to a 90 degree elbow and a down draft carb. Just wondering why? |
Ernie
Senior Member
Username: ernie
Post Number: 1170
Registered: 01-2002
| | Posted on Monday, March 08, 2010 - 01:12 pm: |
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John,
If you are refering to an up draft carb I have noticed that the usual Schlebler when set up for up draft vs side draft seem to leak or drip a lot less. Also it got the air intake closer to the cooler air in the bilge.
I went to a lot of effort with the Schlebler in my boat that is side draft to get it so it doesn't drip.
Up draft vs down draft vs side draft referes to the direction of the air flowing through the carb.
Hope this helps
Ernie |
John Davis
Senior Member
Username: johnny
Post Number: 275
Registered: 03-2006
| | Posted on Monday, March 08, 2010 - 06:20 pm: |
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Ernie,
Thanks for keeping me straight on the updraft and downdraft. I'm not sure why I called it downdraft because I remember when I was a teenager we had a few of the older larger Briggs & Stratton engines that had updraft pipe & carbs stock from the factory. I still have one of them now on a antique garden tractor. I think it is about a 8hp Briggs.
I now own a couple of antique marine engines that have the schebler "D" model carbs on them which I have not run. I plan on going completely through the carbs and rebuilding them including the needle setup. I have read most of the information on this forum about Scheblers and what you guys have done to make them work better with no leakage. On a updraft carb you would think that the draft, air & gas mixture would not be as efficient because of being further away from the intake. |
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