BenzWorld Junior Member
Date registered: Sep 2011
Vehicle: 1966 250S
Location: Austin, TX
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Thanks bostosh. I don't see smoke or anything like that if that's what you mean, but I know the vapors are there.
I went ahead and made this change yesterday, and I have two observations. I think I've lost a little power... not much but a noticeable amount. I assume this is due to blow-by gasses displacing a small amount of air with higher oxygen content at the carb intakes, and I think I can compensate for it with a little carb tuning.
The other thing I've noticed is a decreased odor level. Usually when parking the car in the garage right after a drive, the kitchen next door smells of fumes for a while. This is understandably annoying to my wife, so I usually park the car outside for a while to cool off before driving in. This morning I went out for a long spin and pulled right into the garage when I got back as a test (wife wasn't home). Don't get me wrong, the garage still smells like a hot old car, but the kitchen wasn't affected at all, so I'm chalking this up as a victory.
On closer inspection, I can't tell if the road draft tube was original or not. It's just a bent plastic tube that was inserted into the end of the breather hose and then held in place by a bracket on the driver's side of the engine near the bottom. The plug in the carb cover was shiny rubber, not painted metal like I initially thought. It still seems to have been a purpose-built plug, though.