Kadron Solex Duels, Has anyone tried this setup? Options

[Nozzle]

Just read a thread comparing the virtues of different carb setups and came across a link for a company selling duel single Kadron carb kits for the type 4 engines.

http://www.shop.kaddieshack.com/BRAND-NEW-...20L-43-4520.htm

I'd never really heard anyone on this board talk much about the duel single-choke carbs as a viable option. It sounds like a nice compromise between the efficiency of a stock D-jet and power of duel twin-choke Webers or Dells.

Has anyone used this setup for a 2.0 engine before and if so what cam did you use?

Thanks,

John

[ChrisFoley]

There's an inherent problem with dual singles on a flat four engine.
The intake pulses aren't timed properly for good balance of the air/fuel charge.
This becomes really apparent if any sort of performance camshaft is installed.

The engine firing order, being 4,3, 2,1 means one carb does 2 intake pulses sequentially and then waits one full crank revolution for the other carb to do its 2 intake pulses.
The result is that the forward cylinders (2 & 4) run at one mixture and the two rear cylinders (1 & 3) at a very different mixture.
This is exacerbated by reversion from any cam overlap which will further screw up the second pulse on both carbs.

Combined with the rather short intake runners typical of a dual carb installation, an engine with a performance cam and dual singles can not be tuned to run well.

[Mark Henry]

There's an inherent problem with dual singles on a flat four engine.
The intake pulses aren't timed properly for good balance of the air/fuel charge.
This becomes really apparent if any sort of performance camshaft is installed.

The engine firing order, being 4,3, 2,1 means one carb does 2 intake pulses sequentially and then waits one full crank revolution for the other carb to do its 2 intake pulses.
The result is that the forward cylinders (2 & 4) run at one mixture and the two rear cylinders (1 & 3) at a very different mixture.
This is exacerbated by reversion from any cam overlap which will further screw up the second pulse on both carbs.

Combined with the rather short intake runners typical of a dual carb installation, an engine with a performance cam and dual singles can not be tuned to run well.

One has to remember that VW already had FI (D-jet) for the type 4 and going to carbs was obviously a cost cutting measure. They only used this for a couple of years before changing the 1.8 bus (and next the 2.0) to L-jet.