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S.Wayne
Samba Member
Joined: May 30, 2025
Posts: 2
Location: CO
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 Posted: Wed Jun 18, 2025 3:40 pm Post subject: Using a synchrometer on Weber 48mm IDF |
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I'm new to this and not to familiar with the forum.
I have a 66 bug with a 2276 motor. The bug started running rough the other day so I began to see if I could figure it out. When when attempting to synchronize the carbs the synchrometer, all cylinders showed five on the test but cylinder 3 showed 0.
Any ideas? Suggestions?
New plugs, new spark plug wires, Flame Thrower coil and new distributor and new fuel filters. The engine was also timed.
Sorry for the dumb questions |
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Schnitzelfuss
Samba Member
Joined: September 18, 2024
Posts: 118
Location: North Alabama
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| Posted: Wed Jun 18, 2025 4:26 pm Post subject: Re: Using a synchrometer on Weber 48mm ID |
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Welcome!
What synch tool are you using? I’m interested in how it can identify individual cylinder performance. The one I use displays the total vacuum pulled by each carb (each carb feeds two cylinders) and displays the difference between the two carbs. Meanwhile, sounds like you have looked at the basics so far. Have you checked for any air leaks downstream of the carbs? If you’ve verified spark at each cylinder arriving when expected, fuel flowing normally, and clean air filters, then it may be time for a compression check. |
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VW_Jimbo 
Samba Member
Joined: May 22, 2016
Posts: 11114
Location: Huntington Beach, CA
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| Posted: Wed Jun 18, 2025 10:41 pm Post subject: Re: Using a synchrometer on Weber 48mm IDF |
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Before turning anything. Clean your idle jet. IDFs are famous for clogging them. After that install a better filter.
Good luck!
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MrGoodtunes
Samba Member
Joined: May 14, 2012
Posts: 1017
Location: South Florida
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| Posted: Thu Jun 19, 2025 1:43 pm Post subject: Re: Using a synchrometer on Weber 48mm ID |
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| Schnitzelfuss wrote: |
| ... I’m interested in how it can identify individual cylinder performance ... |
Answer is in topic heading, 48 IDF. These have 4 venturis, one for each cylinder; versus your carbs which (like mine) are single barrel carbs feeding two cylinders per carb. |
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Schnitzelfuss
Samba Member
Joined: September 18, 2024
Posts: 118
Location: North Alabama
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| Posted: Thu Jun 19, 2025 3:54 pm Post subject: Re: Using a synchrometer on Weber 48mm IDF |
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| Thanks! I’m assuming he still has but two carburetors. My question was, what synchrometer can discreetly identify the vacuum pulled by each cylinder? |
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richparker
Samba Member
Joined: November 24, 2011
Posts: 7490
Location: Durango, CO
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| Posted: Thu Jun 19, 2025 8:46 pm Post subject: Re: Using a synchrometer on Weber 48mm IDF |
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I’m gonna go with the #3 wire isn’t fully plugged onto the spark plug. Damn near impossible to get your hand back there unless you have carb windows or you removed the carbs and intakes when you installed the new plugs and wires.
How are you keeping that engine cool? Are you using Marvel Mystery Oil in the gas to keep the carbs from boiling? Vented deck lid? What clutch? Where are you in Colorado? I have so many questions.
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