cammy - sounds like an incredible project you are currently doing.
I was very surprised (and extremely excited) to hear about your project which is almost certainly the only other one of it's kind currently being considered on the planet....
I too have a 3.5l Low Compression Rover V8 running Twin SU HIF44 carbs. Perhaps more uniquely I am looking to supercharge this engine configuration by blowing directly at the SU's and letting them sit on the current manifold.
I've seen another thread elsewhere about getting the SUs to run under boost. Think you just have to do a bit of sealing but should be able to get away with avoiding to box the little buggers in. Also - mine are new so I want to keep them out and showing off their shiny dashpots
My plan is to stick a roots-type supercharger, possibly an Eaton M90 - off on a bracket to the side of the Rover lump. Perhaps easier said than done. Once in situ, to put some silicone hoses in play, with a Y piece, taking equal lengths of hose to the intakes on each of the carbs. On each piece of hose, just before the carb attachment, I'll be putting in some blow-off/pressure relief valves so that after a quick throttle shut, the pressure can escape before throwing the butterflies in the SU body into the engine!
The main things I'm concerned about at the moment are:
1. Fabricating sufficiently strong and practicable bracketry to actually mount the blower
2. The possible sealing issues with the SUs if my thoughts above prove incorrect!
3. Correct configuration of the blowoff valves
4. Carb tuning - how to adjust the SUs to ensure good fuelling under boost, i.e. terrified of going too lean! And do I need new needles capable of really pouring the good stuff in?
5. How much boost to generate. Don't want to go too nuts but need to calculate somehow how big a radius of pulley is needed so that I get the right Psi.
(Straightforward!) :p
Really look forward to hearing back from you. If you have any thoughts on the above then any advice much appreciated!
).
