Quote:
Originally Posted by resto108
So sorry for my prior statement. I used to be on some sort of forum for my 65 Lincoln and it really pissed me off when people who didn't have a 65 Lincoln but who had worked on "a lot of Fords" would chime in with their rubbish advice that applied to a Ford, but not a Lincoln. And now I've done the same. Well, to make this an educational opportunity, does anyone know the reason? Generating vacuum seems out because it has a vacuum pump. Seems to me it would need to be arranged so it would get air and fuel at roughly the same rate, or does it literally just open all the way as soon as you step on the pedal and is only there to allow for shutting down the engine by starving it for air?
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Don't worry about it - the OM615 is a bit of a weird one (I think other earlier Mercedes diesels also had this weird arrangement - but I can't quote the numbers off the top of my head!)
I don't know for sure why this arrangement was used - I would hazard a guess (and it is only a guess) and say it is probably a Bosch thing. Or if it wasn't Bosch, perhaps the more commonly known configuration is more of a Bosch thing - dunno for sure.
If you want to "read all about it" the W123 FSM on the startek site for the non turbo OM61X engines has a big old write up in chapter 7 describing how the OM615 throttle valve system works. It then goes on to describe how the OM616/7 system works. Great anorak stuff (!)