carburetor vs fuel injected |
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carburetor vs fuel injected |
bigjim |
Mar 6 2004, 01:30 PM
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#1
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Newbie Group: Members Posts: 10 Joined: 5-March 04 From: el centro,ca Member No.: 1,752 |
(IMG:style_emoticons/default/headbang.gif) okay i give up, i want to go to carbuertor here is the question which one to do duals or SINGLE PROGRESSIVE 32/36 i like the idea about one carb any thoughts 1976 2.0l d-jet 914
jim |
914ghost |
Mar 7 2004, 11:25 AM
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#2
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BOB Group: Members Posts: 406 Joined: 25-November 03 From: Wenatchee Washington Member No.: 1,387 |
About the Carb vs Manifold size too-
Having a Larger carb diameter than manifold is sort of like the venturi effect. When you get carbs you can make them "run" with just about any vent/jet setup BUT larger is not always better- Matching the intake manifold to the head is purely for airflow. But you want a constriction somewhere in the circuit to increase air velocity. Thats a venruri. Some people think a larger venturi = more air + more gas = more power. Not really, the engine should create the same amount of negative pressure on each intake stoke so a smaller venturi will make the air passing though it move faster. So there's less chance of the fuel condensing out of the mixture. Also, the smaller venturi has the effect of more 'vacuum' at lower RPM for the carb and can cause the carb to run on a richer or power ciruit sooner- counteracting the leaning effect of a smaller venturi. Same idea about a smaller diameter runner- the learger the diameter the intake runner the slower the mixture will travel thru it and the greater the chances the fuel will de-atomize. Thats just for starters...it gets waaay more complicated. (IMG:style_emoticons/default/blink.gif) -Bob O |
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