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We have produced our own range of cast alloy intake manifolds for the many SU applications covering the A-Series engine. The single SU manifolds are developed to give maximum airflow and gas speed, yet fit all engines even if the standard air cleaner set-up is used. It has 1/2" pipe thru for heating with water and the as-cast finish provides maximum fuel atomization.
C-AHT771 takes 1.5" or 1.75" carbs, HS or HIF type; designed for 1.75". It has large port runners for use on extensively modified heads on big bore engines.
Comes without studs. Use studs C-22A152 x 4.
Recent development has recently encompassed a detailed look at the manifolds available for side draught carbs. The steel inlet manifolds available have long been acclaimed the very best, out-performing all the alloy types by far. After flow-testing a number of randomly picked steel manifolds, the results showed that as a rule they did not meet their expectations and varied - considerably in some cases - from one port to the other on the same manifolds. Despite this they were still superior to the other manifolds available.
Having set a base-line of data we have designed an alloy manifold that out-flows the steel ones, is extremely consistent port to port, and greatly reduces port-biasing of the mixture. The results were as follows:-
Steel Mini Mania
The manifolds tested were all unsettled, in fact the alloy ones were straight out of the casting box. We tidied up very slightly the short manifold to see what happened, and the flow went up to 117.2CFM. That is another benefit of the alloy manifold, there is scope for modifications to increase flow even further. We expect the flow figures to be higher on the finish machined manifolds.
The Cast manifolds come complete with rose- jointed linkage mounted directly to the manifold to eliminate flexing. The low line of the linkage makes it ideal for Sprite or Midget applications.
Also stocked are the steel Maniflow manifolds:
Two types of steel formed inlet manifolds are available for the Arden 8 port alloy head.
We have produced our own range of cast alloy manifolds for the many SU applications covering the ‘A’ series. The single SU manifolds are developed to give maximum airflow and gas speed yet fit all engines even if the standard air cleaner set up is used -without requiring massive bulkhead alterations and speedo cable re-routing. The as-cast finish provides maximum fuel atomization.
Both have water heating facility ( 1/2" tube).
The twin SU manifolds have been carefully produced to minimize cross-port-flow interference caused by the balance tube, and have good radii in all the right places. Further blending can be carried out if required, but leave a ground finish to promote, fuel atomization. DO NOT POLISH!