 Weber carb set up help, Jetting seemed to help but still slight popping/backfire |
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| North Coast Jim |
 Oct 20 2016, 09:33 AM
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Member  Group: Members Posts: 323 Joined: 11-December 15 From: Northern Ohio Member No.: 19,450 Region Association: MidAtlantic Region 
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Just finished a new 2 liter engine build with Webcam for carbs installed.
New Raby heads, Hoffman Eng, are used. New 44IDF Webers installed with cross bar linkage. Valve lash to spec and timing is spot on. Carbs are synched. Continue to hear a slight popping from only the pass side carb at partial throttle positions. Car starts and idles with plenty of power thru acceleration, but who knows I haven't driven one in over 25 years. It's a hoot to drive except for the Issue. Played with jetting to no avail. Any Carb guru's out there able to provide input to solve this dilemma. (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/confused24.gif) |
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| Catorse |
Oct 20 2016, 09:43 AM
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Member Group: Members Posts: 194 Joined: 27-August 15 From: Los Angeles Member No.: 19,106 Region Association: Southwest Region |
QUOTE(North Coast Jim @ Oct 20 2016, 08:33 AM)  Just finished a new 2 liter engine build with Webcam for carbs installed. New Raby heads, Hoffman Eng, are used. New 44IDF Webers installed with cross bar linkage. Valve lash to spec and timing is spot on. Carbs are synched. Continue to hear a slight popping from only the pass side carb at partial throttle positions. Car starts and idles with plenty of power thru acceleration, but who knows I haven't driven one in over 25 years. It's a hoot to drive except for the Issue. Played with jetting to no avail. Any Carb guru's out there able to provide input to solve this dilemma. (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/confused24.gif) Did you initially set up your carbs for a lean best condition at idle? Also, tell us where the problem happens, approx RPM. |
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| North Coast Jim |
Oct 20 2016, 10:22 AM
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#3
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Member Group: Members Posts: 323 Joined: 11-December 15 From: Northern Ohio Member No.: 19,450 Region Association: MidAtlantic Region
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QUOTE(Catorse @ Oct 20 2016, 11:43 AM) QUOTE(North Coast Jim @ Oct 20 2016, 08:33 AM) Just finished a new 2 liter engine build with Webcam for carbs installed. New Raby heads, Hoffman Eng, are used. New 44IDF Webers installed with cross bar linkage. Valve lash to spec and timing is spot on. Carbs are synched. Continue to hear a slight popping from only the pass side carb at partial throttle positions. Car starts and idles with plenty of power thru acceleration, but who knows I haven't driven one in over 25 years. It's a hoot to drive except for the Issue. Played with jetting to no avail. Any Carb guru's out there able to provide input to solve this dilemma. (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/confused24.gif) Did you initially set up your carbs for a lean best condition at idle? Also, tell us where the problem happens, approx RPM. Set up per Weber install procedure with best lean condition. Checked it again before sending this request. Happens under 2500 RPM in partial and lagging throttle positions. |
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Posts in this topic
North Coast Jim Weber carb set up help Oct 20 2016, 09:33 AM
Elliot Cannon This is interesting since I am having the same pro... Oct 20 2016, 10:34 AM stugray I struggled with my carbs lately and just got them... Oct 20 2016, 11:50 AM
Kansas 914
I struggled with my carbs lately and just got the... Oct 20 2016, 01:45 PM
Mark Henry 98% of the time it's a linkage issue, both car... Oct 20 2016, 10:46 PM stugray
98% of the time it's a linkage issue, both ca... Oct 21 2016, 02:07 AM Elliot Cannon I decided to check the idle jets one more time. E... Oct 20 2016, 01:34 PM stugray
I decided to check the idle jets one more time. ... Oct 20 2016, 02:29 PM Elliot Cannon To make sure mine opened all the way to WOT and op... Oct 20 2016, 10:52 PM Mark Henry To me, cable or not, you still have one carb openi... Oct 21 2016, 04:46 AM North Coast Jim
Just finished a new 2 liter engine build with Web... Oct 21 2016, 12:13 PM SKL1 Good info- some news tricks as I'm fighting t... Oct 21 2016, 09:39 PM Perry Kiehl Clone Here's my carb tuning procedure from a March 0... Oct 22 2016, 06:39 AM |
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