road draft tube
#1
road draft tube
I have 57 Olds with 371, the road draft tube at the back of the engine it has always put excessive oil out at the bottom where it ends at the frame. I decided to take the valley pan off and check and see what is what. the baffle is there and I took it off to see if was broke it was not . I cant figure why I get so much Oil and how I can fix it. Have any of you experience this problem if so what you did to fix. I know I could plug the hole and put in vale cover breathers but would like to keep tube if possible.
Thanks SID
Thanks SID
#4
Quite common problem with 371 and 394's because of increase in compression and of course old age. Some people have converted to a PCV system and run the blow by back through the carburetor/air cleaner. This isn't a fix for anything but will keep the oil off the bottom of your car..... Tedd
Last edited by Tedd Thompson; December 7th, 2016 at 04:38 PM.
#5
Quite common problem with 371 and 394's because of increase in compression and of course old age. Some people have converted to a PVC system and run the blow by back through the carburetor/air cleaner. This isn't a fix for anything but will keep the oil off the bottom of your car..... Tedd
#7
SID if your compression is good and you're still unhappy with the oily mess then I suggest either installing a PCV system or you might try running a rubber hose from the road draft tube to a charcoal canister. Either way it seems you will have to modify the engine from stock.
#8
I am not sure but the 63 and 64 394 probably had a PCV system. You should be able to adapt the PCV system to your 371. I imagine the valve covers are different so they would have the provision for the PCV valve which would include a baffle under the PCV valve so it doesn't suck oil. You will need to plug the block where the draft tube attaches. It should be pretty simple and not cost very much.
#9
It is the nature of the beast. Its atomized oil spraying into the wind. My dad's 60 Plymouth does it, and so does my 01 Ram with a cummins which has a road draft tube. You can either put it into a breather catch can, or try to stuff some filter material in there, but you will need to check and change it with the oil changes.
#10
#11
I know California cars were equipped PCV valves in the early 60's but I'm not sure when the rest of the world started to add them. If you could find a set of California valve covers you could covert to that system or I have seen the draft tube modified to take a PCV valve and reroute the fumes back through the carb or air cleaner. This is pretty common hot rod fix back in the 70's.... Tedd
#12
What you can do is block the end of your draft tube, install a grommet in the side that will accept a pcv and run your vacuum to the manifold or a carb port. Fresh air will enter through the oil fill tube.
#13
It is the nature of the beast. Its atomized oil spraying into the wind. My dad's 60 Plymouth does it, and so does my 01 Ram with a cummins which has a road draft tube. You can either put it into a breather catch can, or try to stuff some filter material in there, but you will need to check and change it with the oil changes.
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