Patented crossover design DCOE Weber manifold to suit BMW 2002 & 1600
The best peforming DCOE Weber manifold available for the BMW 2002 or early 3 Series.
Single side draft manifold for a BMW 2002 or early 3 series. Utilizes a patented Crossover design for even fuel distribution to each cylinder. Where other single carburetor manifolds fail, this one is in a class of its own. This is an internationally patented item so you will not see another manifold like this available. We have been producing these manifolds in Australia for over 25 years so the sales volume speaks for itself. Others have tried to copy this manifold but their results are horrible! Buy with confidence as you will be pleased with the performance.
Here is the mechanism by which this manifold works for all those that are confused by the crossover manifold concept... The manifold runners on cylinders 1&4 connect to one venturi (V1) of the carb, therefore cyls 2&3 connect to the other side of the carb (V2). With the firing order being 1,3,4,2 the intake pulse demand from the first cylinder(1) draws mixture from V1 venturi of the carb. The next one demanding a lungful is cylinder 3, which draws from venturi V2. The next one in the sequence is cylinder 4, which draws from the same venturi (V1) as number 1 cylinder and then number 2 cylinder draws from number 2 venturi(V2). You can see that the carb takes turns in feeding the cylinders due to the crossover design of the runners feeding each cylinder a fresh batch of air/fuel from the carb, alternating throats as it goes!
The patented crossover design does just that- it splits the pulses (in firing order sequence) that are created by the downward movement of the piston so as one throat receives one pulse, and the next pulse (in the firing order sequence) goes to the other side of the carb. This way the pulses that the carb sees are evenly spaced, allowing better cylinder filling than the conventional design, hence more power and torque. Holley patented a style of manifold like this for the dual plane 4bbl S/B Chev, as they suffer from the same problem of all the available mixture being siphoned off from one side of the manifold, leaving nothing for the next one in the sequence (The firing order for the Chev is 1, 8, 4, 3, 6, 5 and then the cylinder next in sequence is siphoning 7, then obviously 2). This is an extraordinary manifold that we back 100%. You will be happy with the unparalleled results. Please contact us if you have any further questions as we would be happy to assist you.