Update and questions on dual carb conversion.

[71_georgia_beetle]

The funds became available and I have completed the conversion. I had a stock 1800, single Weber Progressive carburetor and an 009 distributor. I have converted to dual Kadron 40/44 EIS carburetors, EMPI short TIV intakes, CSP TIV bell housing linkage and a 205P SVDA distributor. All went well except for the manifolds, the bottom two nuts are damn near impossible to get on. Pushing, pulling, wedging the tin down with a 2x4 and fabricating a tool, I finally had them on. The next challenge was the CSP bell housing linkage. To use this particular linkage, the carbs must be mounted 180 degrees of normal, throttle plate facing the front of the bus.

But damn what a result. No more bow or dip during acceleration due to the 205P SVDA, power out the wazoo, no more marginal heat issues and a new throaty sound. The pedal works like butter thanks to the massive ball bearing in the CSP linkage and the engine bay looks awesome to boot.

Over all I am very impressed. It really is like a whole new bus.

The only question I have is, the Bently manual say for the 73-73 TIV, dual carb setup that it should be timed out at 10 degrees ATDC, not static 10 degrees BTDC like the idiot book. I set it at 28-32 full advance which is about 8-10 BTDC at idle. At (Bentley) 10 degrees ATDC it backfires through the carbs and blows fire. Any thoughts on this? 28-32 full advance ok?

Also, I now have a curious shake to the engine. With a 2nd by a friend I began trying to balance the two again. I have fine tuned them as close as I can get them but the engine has this little shake still. Still out of sync or something inherent of dual carbs?


Scott
_________________
71 Standard Beetle "Big Bird"
74 Westfalia "Winifrid"
Call me if I need you!
www.burelphotography.com

[Oil Phil-M]

The vacuum advance/retard cans are specific to the vacuum signal produced by the factory intake system. If you look in Bentley you'll see a page listing all the different distributers used and the subtle differences. The timing method listed is only good for original intake and distributor combinations

When you switch to a different intake system you have to time your distributor by mechanical advance only. 28-32 degree range max. Once set you can hook up the vacuum advance and gain whatever advance you can at partial throttle. If you have a stock DVDA instead of the SVDA you would NOT attach the vacuum to the retard port just the advance port.

[Randy in Maine]

I agree. Time it to what Phil said in that 28-32º range when it is all in and I would suggest starting at the 28º side first.

I assume that that you intend to tap the distributor vaccum line into ported (not manifold vacuum) from the carbs. You want nothing at idle and some as it runs to give you that vacuum advance we long for.

Did you synchonize the carbs yet? If I had dual carbs, I would own one.

[71_georgia_beetle]

[keifernet]