Date registered: May 2011
Vehicle: 1970 Mercedes 250c, 1977 mercedes 230 (put to rest at a junyard she served me well)
Location: Great Barrington, MA
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Boosting cars with mechanical distributors w/vacuum, and automatic trans w vacuum
I have a 1977 mercedes 230, its a w123, I've been driving it daily and just having fun with it for a while, but I'm about to buy a truck for work/daily driver, and thinking of turning the 230 into a kind of rat rod.
It's not really a common model of the 123's but its very rusted and not really eligible for restoration. It only had 106 thou when i got it, has about 120 right now, which is still pretty young for these cars, so mechanically its decent. I just got the valve clearance adjusted so compression is pretty good now and its running smooth, and faster than it's ever been since I've owned it, which has been almost a year now.
I am wondering about how/ or if it is possible to add boost to a car that has vacuum systems in it?
Obviously the locks aren't going to work anymore, and I've removed the pollution control (which wasn't doing anything anyway, cat removed by previous owner, the manifold that injected air into the exhaust ducts completely pitted and broken apart) and warmup valves so the only crucial vacuums functions left are the distributor and the transmission vacuum modulator.
The most popular w123s are the 300d and turbo diesel version; I don't know a lot about the diesels but I know Mercedes was really into the vacuum system thing, so i figure they must have some method of creating vacuum as well as boost.
Soooo long story short, how do you change this car which is designed to run with negative pressure in the intake manifold, so that it can run boost? or is it not possible?
Would adding a cold air intake affect the pressure and therefore distributor timing at higher speeds?
How can I get more air blowing through this thing? Or alternatively, what could I do to get some more hp out of it?
Any info about this is much appreciated.