Okay, help with my motor, was: "carb dial in help? (webber IDF 44)" |
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Okay, help with my motor, was: "carb dial in help? (webber IDF 44)" |
VaccaRabite |
Jul 5 2008, 12:31 PM
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#1
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En Garde! Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
*edit* Note, cylinder bank 3/4 is not firing. Plugs are oil fouled. All four cylinders have decent compression, considering that the rings probably are not set yet. Carbs are fresh rebuilt, I have yet to check spark.*/edit*
I have set my idle at 1K rpm. Idle adjustment screws for the 3/4 bank is almost all the way out. Idle adjustment screw for 1/2 bank several turns in. Both carbs are idling at 5 kg/h according to my flow meter. Mix screws for all 4 carbs are 2.5 turns open. When I open the throttle to ~3K rpm, the 3/4 bank only sucks slightly more air. The 1/2 bank jumps up to about 15 kg/h. So, where am I off. I have my weber tech manual too, but thought I would ask here to see if I got a faster "ah-ha" type answer (like usual). |
VaccaRabite |
Jul 5 2008, 01:39 PM
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#2
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En Garde! Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Compression numbers - keep in mind, this is a fresh rebuild that has not seen any road time (Bench test only), so I doubt my rings are set yet. Engine was warm for the comp test.
Cyl3 115 Cyl4 105 Cyl1 115 Cyl2 122 So, the engine is making compression. The spark plugs for 3/4 are oil fouled (duh) and the plugs for 1/2 look perfect. I did leak down (engine cold) the other day, and everything was between 8% and 12% leak. Again, for a cold engine, with rings not set yet, thats not too bad. What do I want to be looking for? Spark next I guess. |
ArtechnikA |
Jul 5 2008, 02:25 PM
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#3
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
What do I want to be looking for? Spark next I guess. spark will have nothing to do with how much air the engine is sucking in. your fouled plugs match the side with bad airflow. find out why that side isn't open as much or why the other side opens too much. you do not need the engine running for this - you can eyeball the bores and check it out. if there are connector links from the individual bellcranks those must be exactly the same length. at half throttle it should be easy to see whether or not the butterflies match exactly. You didn't say (in this thread) how big the engine is nor the venturiis. 44's pretty big. BTW - if the venturiis are not the same on both sides (you checked, right?) you will never match flow.... |
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