1914cc Dual 40mm - Shakes at idle

[roymann]

Help! - Engine has less than 10,000 miles on it. New motor mounts were installed from Mid-America. To eliminate the bad motor mounts possibility, I fabricated a brace ( see pic) , bolted to the pass. side exhaust and frame - now shake is transferred to the whole car. Feels like a misfire to me. Here is a list of recent changes to try to correct the shake:

Originally bought 1914cc long block from JCS Volks Machine - shook from day one at 1000 rpm idle.
9,500 miles later - Heads removed and sent to reputable shop for 3 angle valve grinding. Valves and springs replaced.
Generator replaced with 55amp alternator.
Checked firing order 1-4-3-2
Valve lash set at .004 push rods are steel and engine starts with one click of the key so there is no compression loss there. Originally set the lash at Zero - still shook.
Brand new Empi 40mm carbs installed - Re-jetted by A.J. Sims at Low Bugget. Fuel mixture screws reset.
NGK spark plugs replaced with new Bosch - gap at 25
Bosch Coil replaced with Petronix Flame Thrower 40K volts
New plug wires by Duralast- Each wire shows flash on timing light.
Loosened Dizzy - Tested advance and retard - set at 30-32 degrees at 3000 rpms. Still shakes at idle after re-set.
Installed Holly Fuel pressure regulator and gauge - Fuel pressure at 2 1/2lbs
Dizzy is 009 with Petronix electronic ignition.
Gas is fresh.
The only thing I did not replace yet is the dizzy. I'm at wits end here running out of ideas.
My original install shook at idle and still shakes after all these attempts. And I don't mean a little shake - it's visible.
What have I missed? Any suggestions?
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73 Bug deVille
77 Vert - Under Destruction

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[Glenn]

Your bracket is solid and transferring any engine vibration to the body. Why do you need those?
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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[roymann]

[Root_Werks]

Sort of sounds like your carbs aren't balanced and/or there's a plugged idle circuit or jet. One barrel out of sync will idle like a dead cylinder and shake a lot.

-Dan
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When I set my timing, why do I flush, then take a pee?

[DerrickfromNC1]

[roymann]

[DerrickfromNC1]

[Dougy Dee]

"Shook from day one..." There's a good possibility you have a piston or rod installed backwards.

[jinx758]

Known problem with the red urethane bushings to cause harshness - be it shift rod, transaxle mounts, or front beam.
If used.

A lumpy cam can do this also. - not sure of motor specs or if engine has always done this.

My half cent guess is on nosecone as suggested.


Best luck ... stay safe

jinx
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" It's not valuable unless you learn something from an experience. " Henry Ford

It's not unlike the same difference ...

My Craigslist rescued 100 footer :
1971 Standard Bug
1776cc dual port
034 distributor
38mm EGAS Carburetor

[DerrickfromNC1]

Your engine rocking if not something internally is diffinitely the “Kadron Rock”. I put a set of kadrons on a 2180 and it basically idles off of cylinders 1 and 3. It was explained to me that one cylinder was robbing the intake of the 2nd cylinder at idle. You have a 2 cylinder motor at idle. A friend of mine has a mild 1776 that has an acceptable idle and his motor has the balance tube connected. My 2180 would idle fairly smoothly at around 1300rpm and a balance tube made no difference either way.

Read these threads:

https://www.thesamba.com/vw/forum/viewtopic.php?t=...ght=kadron

https://www.thesamba.com/vw/forum/viewtopic.php?t=760383&highlight=kadron

[roymann]

[VW_Jimbo]

Pull the plug wires one at a time and see if the missing can be narrowed down to a single hole. If you can find the dead hole, you can narrow it down. Might just be a plugged up idle jet. A shot of carb cleaner would tell you really quick!

Steel pushrods are set to loose zero, warmed engine. Stock are set to .006 stone cold. Where did you get .004” from?
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Jimbo

There is never enough time to do it right the first time, but all the time necessary the second time!

[roymann]

[VW_Jimbo]

[roymann]

[67rustavenger]

I think jimbo meant pulling the sparkplug wires one at a time to see which cylinder is not firing.

Is this engine dual single carbed or dual dual throat carbed?
BTW, dual single carbs typically idle on 2 cylinders.
That might be part of your issue, if your engine is so equipped.

Please post a pic of the engine. We're all guessing on what's going on.
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[roymann]

[VW_Jimbo]