 Weber carbs, What's the difference? |
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| 914 Monster |
 Apr 13 2010, 09:13 PM
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Newbie  Group: Members Posts: 27 Joined: 14-April 08 From: Los Angeles Member No.: 8,924 Region Association: Southern California  |
Since I'm in the process of rebuiling my 2.0 engine, I was wondering why 914 high performance engines use 44 IDF carbs instead if 48 IDF's or IDA's. I'm not trying to build a race car or anything to much but want to upgrade my 40 IDF's.
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| pbanders |
Apr 14 2010, 11:08 AM
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#2
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Senior Member Group: Members Posts: 939 Joined: 11-June 03 From: Phoenix, AZ Member No.: 805 |
When airflow is low (e.g. idle) a large venturi results in a low airspeed, which leads to poor fuel metering and poor atomization. The poor atomization means you have to increase idle richness to get it to run at all, and it still will idle poorly. Carb venturi size is a compromise between good running characteristics across a wide range of engine speed and load levels, and 40's and 44's have proven to be the best compromise for T4's of 2.0L or somewhat greater displacement.
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Posts in this topic
914 Monster Weber carbs Apr 13 2010, 09:13 PM
Cap'n Krusty Because the builders don't want to overcarb th... Apr 13 2010, 09:21 PM GeorgeRud Don't go too large on the venturi diameter, or... Apr 13 2010, 09:22 PM Rand The answer is in your post. 2.0. There are a ton o... Apr 13 2010, 09:24 PM 914 Monster How exactly does one overcarb an engine? Apr 13 2010, 09:42 PM
Rand
How exactly does one overcarb an engine?
Are you... Apr 13 2010, 10:03 PM
ArtechnikA
How exactly does one overcarb an engine?
Here... Apr 14 2010, 04:59 AM 914rat Too much gas+too much air=overcarbed engine.More g... Apr 13 2010, 10:01 PM tat2dphreak
the question should be "how does one NOT ove... Apr 13 2010, 10:04 PM zymurgist +1 :agree: Apr 14 2010, 05:09 AM ME733 .........well done Artechnika....I agree.....and t... Apr 14 2010, 06:38 AM 9146986 IMHO you want your 40's with 38 venturis. If ... Apr 14 2010, 09:17 AM Jake Raby
Since I'm in the process of rebuiling my 2.0 ... Apr 14 2010, 10:51 AM |
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