No problems with SD-8
I've had the SD-8 on the IO-540-D4A5 with 9:1 pistons for 1000 hours with no problems, and on my first RV-10 with 9.2:1 pistons for 800 hours with no problems. I know early on B&C had some problems with the coupling shearing, but they fixed that with a stronger coupling.
Just recently went to the B&C 40 amp on the vacuum pad so it would carry the whole load if needed.
Vic
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 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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