I gave up on the W126 pump. There's no way around the built-in electronics of the blow-suck cycles. So, I opted for the original pump I tinkered with a while ago. It's from an Audie. I hate using non-MB parts, even for a mod. It's close enough ... German made. Runs nice. I am going to run 2 lines off the vacuum port: one "T-ing" into the resevoir in the back and one line running up to the front of the engine into a 4 way deal. I will remove all vacuum lines from the engine bay (except the one to the IP) and have them tucked inside under the dash. The W126 pump is for sale.
I am totally SHOCKED it fits just about perfectly in the foam rubber housing. I also found a good use for the thick neoprene jackets from the cone filter I just removed. Two of them fit around the head of the pump perfectly. I like the way it fits the head in one end of the foam housing and open space for the other end, with the hose outlet and wiring fitting where the MB part went. Normally, mods are a PITA sometimes. This will get rid of my mechanical vacuum pump. Since I am going with manual brakes, I only need minimum vacuum and I don't need it 100% of the time. This clears out some needed space in front of the engine and clears the way for the serp belt set up I got cooking. I already tried the machined plate for around an hour with no booster and I am likewise surprised ... so I am guessing once I mod the ratio to 5:1, it might stop better than vacuum assisted. No way for the flagship 6:1 ratio.
Now, I am looking for a decent vacuum shut-off switch. Anyone out there run a 12V switch they like ?
