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The RB motors were intended on being run on 5w-30 originally. Yes it is a desgin flaw as you put it but none the less it is true. Jun and other companies make small restrictor plugs with only a 3mm apperture hole in them for the top of the block in the oil feed holes. These little brass plugs reduce the original 5mm hole down.
Keep in mind just as the SR motors the RB's have no cam bearings, but only jurnals in which the cams ride on. So having a lot of oil in the head was the idea but it seems the return holes are too small in the block and head. Opening them up isn't an option because at lower rev's you starve the cams. it's really a catch 22 but if you intend on running high revs for extended periods of time you can't go to a heavy oil.
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06-09-2004, 04:46 AM
