Saw that above mentioned engine in service yesterday. Not a lot more to report. lHas a total of about 5 hours on it, so can't say much. Drives a ST 10Kw gen head..
It is in a room about 10 X 12 ft. and seems very loud compared to a 6/1 Lister(oid). Mostly intake noise, though what % is hard to say. This Redstone is being used as a standby unit, so will probably not get a lot of use during its life.
There, at least one is working for its living, even if part time.
Cheers,
Hugh