John_Mc Posted February 18, 2018 Share Posted February 18, 2018 Hi, I spoke to an Zephyr vendor on the phone yesterday on a road draft issue and I’m more confused now more than ever. I have a 1941 V-12 that has a tube that runs from the intake manifold to the air cleaner. I also have a stub (port) coming out of the oil filler tube at the back of the engine. Do I still need a road draft tube or can it just be capped off. If I do need one, anyone know where I can find one at a reasonable price?? Thanks! Link to comment Share on other sites More sharing options...
Ken/Alabama Posted February 19, 2018 Share Posted February 19, 2018 The later V12s didnt have the tube that came off the oil filler pipe . They have the pipe from the intake to the breather only. Link to comment Share on other sites More sharing options...
John_Mc Posted February 19, 2018 Author Share Posted February 19, 2018 Ken, that’s what I thought too. Think I could just cap off the draft tube port? Link to comment Share on other sites More sharing options...
hchris Posted February 19, 2018 Share Posted February 19, 2018 (edited) Not being familiar with the Zephyr I would nevertheless be cautious about blanking off any draft tube orifice. Most vehicles in this era had a draft inlet thru the oil filler cap and a draft tube exit from the rocker cover or side plate on the block, blanking off any of these ports will lead to over pressurisation within the crank case / block and thus the internal blow by pressures will seek an outlet, more often than not back thru the filler worse via the crank shaft seals. It might be worth a bit more research before applying any blanks, or at the very least keep an eye out for any external oil leaks if you do go ahead. Edited February 19, 2018 by hchris error (see edit history) Link to comment Share on other sites More sharing options...
Grimy Posted February 19, 2018 Share Posted February 19, 2018 It has been a LONG time since I had a HV12, specifically a 1948 Continental, but I remember very well that one of the inherent issues of those engines is that they have insufficient venting of crankcase gases. Therefore, don't plug the road draft tube but rather improve venting, perhaps by a PCV. The Ocee Ritch book of the mid-1960s describes a number of modifications including adding a Y-block V8 crankcase vent, a fan to help disperse crankcase gases, and others. I'm sure some of the current Lincoln owners will chime in with the latest and most optimal means of addressing this issue. Please wait for them to provide the best information. In this writing, I just wanted to ask you to hold your horses until more knowledgeable parties can give you the best guidance. Link to comment Share on other sites More sharing options...
John_Mc Posted February 19, 2018 Author Share Posted February 19, 2018 2 minutes ago, Grimy said: It has been a LONG time since I had a HV12, specifically a 1948 Continental, but I remember very well that one of the inherent issues of those engines is that they have insufficient venting of crankcase gases. Therefore, don't plug the road draft tube but rather improve venting, perhaps by a PCV. The Ocee Ritch book of the mid-1960s describes a number of modifications including adding a Y-block V8 crankcase vent, a fan to help disperse crankcase gases, and others. I'm sure some of the current Lincoln owners will chime in with the latest and most optimal means of addressing this issue. Please wait for them to provide the best information. In this writing, I just wanted to ask you to hold your horses until more knowledgeable parties can give you the best guidance. Great advice, thanks! I’ll hold off for now 2 minutes ago, Grimy said: It has been a LONG time since I had a HV12, specifically a 1948 Continental, but I remember very well that one of the inherent issues of those engines is that they have insufficient venting of crankcase gases. Therefore, don't plug the road draft tube but rather improve venting, perhaps by a PCV. The Ocee Ritch book of the mid-1960s describes a number of modifications including adding a Y-block V8 crankcase vent, a fan to help disperse crankcase gases, and others. I'm sure some of the current Lincoln owners will chime in with the latest and most optimal means of addressing this issue. Please wait for them to provide the best information. In this writing, I just wanted to ask you to hold your horses until more knowledgeable parties can give you the best guidance. Link to comment Share on other sites More sharing options...
Ken/Alabama Posted February 19, 2018 Share Posted February 19, 2018 Yes John, you can block it off . After 1937 the V12 did not have the draft tube from the oil filler. Link to comment Share on other sites More sharing options...
Mssr. Bwatoe Posted February 19, 2018 Share Posted February 19, 2018 (edited) 36-38 HAVE A DRAFT TUBE AS PART OF THE OIL FILLER- 39-48 DO NOT, BUT HAVE A FORD STYLE CAP WITH OIL SCREEN TO FILTER INCOMMING AIR--DRAWN IN FROM THE AIR FILTER BREATHER TUBE- JOHN YOU SNUBBED ME AT THE GILMORE WHEN I TRIED TO HELP YOU SO I SELDOM REPLY TO YOUR STUFF, BUT YOU NEED TO TALK TO PROF BOZARTH OR OTHERS WITH 37'S 40-ON HAD OIL MESH CAP, EARLIER HAS SEALED LID. Edited February 19, 2018 by Mssr. Bwatoe (see edit history) Link to comment Share on other sites More sharing options...
Mssr. Bwatoe Posted February 19, 2018 Share Posted February 19, 2018 (edited) IT IS A ROAD DRAFT, NOT HOOKED TO THE AIR CLEANER IN ANY WAY (HOLE IN AIR CLEANER THIS WAS A TRICK ON WORN OUT MOTORS TO HELP REDUCE STINK) Edited February 19, 2018 by Mssr. Bwatoe (see edit history) Link to comment Share on other sites More sharing options...
Mssr. Bwatoe Posted February 19, 2018 Share Posted February 19, 2018 Link to comment Share on other sites More sharing options...
Ken/Alabama Posted February 19, 2018 Share Posted February 19, 2018 Since you have the later engine and intake with the breather tube up to the air cleaner why not run it like it was originally. Link to comment Share on other sites More sharing options...
John_Mc Posted February 20, 2018 Author Share Posted February 20, 2018 (edited) 9 hours ago, Mssr. Bwatoe said: 36-38 HAVE A DRAFT TUBE AS PART OF THE OIL FILLER- 39-48 DO NOT, BUT HAVE A FORD STYLE CAP WITH OIL SCREEN TO FILTER INCOMMING AIR--DRAWN IN FROM THE AIR FILTER BREATHER TUBE- JOHN YOU SNUBBED ME AT THE GILMORE WHEN I TRIED TO HELP YOU SO I SELDOM REPLY TO YOUR STUFF, BUT YOU NEED TO TALK TO PROF BOZARTH OR OTHERS WITH 37'S 40-ON HAD OIL MESH CAP, EARLIER HAS SEALED LID. I snubbed you at the Gilmore??? Please explain in a PM or here, as I have no idea about what you are speaking. Gilmore was a wonderful event and I had no friction with anyone over anything that I recall and don't remember meeting or having any trouble that needed assistance. Are confusing me with someone else? Edited February 20, 2018 by John_Mc (see edit history) Link to comment Share on other sites More sharing options...
John_Mc Posted February 20, 2018 Author Share Posted February 20, 2018 Thank you for all the input, I should have posted a picture of what I currently have with a mesh air cleaner and an intake breather. Link to comment Share on other sites More sharing options...
38ShortopConv. Posted February 20, 2018 Share Posted February 20, 2018 That looks like a hot air heater to me, I have one on my 38 convert. coupe, nice cosy warmth. Link to comment Share on other sites More sharing options...
Ken/Alabama Posted February 20, 2018 Share Posted February 20, 2018 Never seen a Hot Air Heater blower turned sideways like that. Link to comment Share on other sites More sharing options...
John_Mc Posted February 20, 2018 Author Share Posted February 20, 2018 Yes, I thought the heater setup was strange too but it does work. The picture that I posted yesterday was terrible, here is a better one that shows my air cleaner, intake tube that feeds the air cleaner and my oil filler pipe that has the road draft tube. So here is my predicament: My car is a '37 but my engine is a '41. I would like to replicate the 1937 look as closely as I can. Should I cap off the port since none was offered in 1941? Or should I put the road draft tube on the filler pipe?? Also have to write that I have a really nice square oil filler cap that I would like to keep using. Would there be any harm done by using BOTH a road draft tube and the open air cleaner with an intake tube??? I can pick up a road draft tube at a reasonable price off of Ebay. The previous owner just stuck a rubber hose on there which really looked like hell. ANy input would be appreciated. Link to comment Share on other sites More sharing options...
19tom40 Posted February 20, 2018 Share Posted February 20, 2018 After reading Mssr. Bwatoe post, IMHO, if you want to add the draft tube, you will have to still use the filter filler pipe cap and block the end of the draft tube, so you will maintain the correct air flow. The draft tube acted as the exit for the vapors on the 37, the pipe to the air cleaner is now the exit for the fumes. An open draft tube would have a vacuum as you drove down the road sucking air from the filter filler pipe. This may not relieve all of the pressure in the crankcase. Link to comment Share on other sites More sharing options...
38ShortopConv. Posted February 21, 2018 Share Posted February 21, 2018 John, my humble opinion, disregarding originality, on a rebuilt motor {no fumes} you could use "either", "neither", or" both" as long as you use a breather cap{ not sealed} on the oil filler tube. When using the air cleaner vent tube system the inlet manifold gasket may need a vent hole punched out below the vent tube. I have found some gaskets don't have that hole. Roy Link to comment Share on other sites More sharing options...
John_Mc Posted February 21, 2018 Author Share Posted February 21, 2018 Excellent advice Roy, thank you. I might just have to forget the original oil cap and use the breather type cap. Link to comment Share on other sites More sharing options...
John_Mc Posted February 27, 2018 Author Share Posted February 27, 2018 I picked up a road draft tube this evening from Chris Harrel. Link to comment Share on other sites More sharing options...
19tom40 Posted March 3, 2018 Share Posted March 3, 2018 John, after doing some research in the Chassis Parts Catalog and the Shop Notes, I believe that you can block the hole in the intake where the pipe goes to the air cleaner and use the 37 carburetor air cleaner and draft tube with the 37 filler tube cap. I cannot find the crankcase air flow diagram for the V-12 engines, so I don;t know for sure where the air intake is when the draft tube is used. I am assuming that the vacuum created at the draft tube will remove the fumes and prevent a build up of pressure in the crankcase. The parts catalog shows that the later intake can be used on the earlier cars by plugging the intake to air cleaner plug. The shop notes state: "Crankcase ventilation: 36-38 Breather outlet under the car, 39-41, Breather outlet into carburetor air cleaner." Of course you will not fool anyone that knows the Lincoln Zephyr engine changes, just dummies like me. Link to comment Share on other sites More sharing options...
DSpringer Posted March 3, 2018 Share Posted March 3, 2018 If you want good crankcase ventilation you should search for posts by Dee Peecher on the subject.On his advice I added a Columbia vacuum takeoff block under the carb that connects to a PCV valve threaded into the vacuum port of the intake manifold on my '41. Not correct, but like Melling oil pumps and solid valve guides with seals, are an improvement on the original design. I haven't had any points taken off in the two shows where I've been judged. Link to comment Share on other sites More sharing options...
John_Mc Posted March 4, 2018 Author Share Posted March 4, 2018 Great information, thanks guys! Link to comment Share on other sites More sharing options...
2nevets Posted March 9, 2018 Share Posted March 9, 2018 I dont mean to hijack this thread but I am in the same dilemma- I also am running an early draft tube on my 41-My question is the oil fill cap on mine is solid and not like the later breather type caps-I assume that is ok? I also am running a pcv valve- Link to comment Share on other sites More sharing options...
38ShortopConv. Posted March 11, 2018 Share Posted March 11, 2018 Sounds OK to me Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now