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Message: [QUOTE="superpsd, post: 1428618, member: 15821"] The B codes has a larger diameter 17.5mm IP and the A code/hybrid body has a 16mm IP. So the complaint is you need more volume of hpo for the larger piston bore to stoke the same 7.1mm plunger the same distance. The oil mods to reduce restricition seem to be drilling more feed holes and increasing poppet lift with I assume machining of the upper seat shim. Reduce restriction and you get less pressure drop and faster actuation and better pressures across the nozzle. A lot can be done to these injectors with just a surface grinder it just has to be done correctly. [/QUOTE]

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