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Stock Exhaust manifold to Clifford intake manifold fitting
https://slantsix.org/forum/viewtopic.php?t=58203		 Page 1 of 2
Author:  octagon5 [ Sat Aug 08, 2015 4:47 pm ]
Post subject:  Stock Exhaust manifold to Clifford intake manifold fitting
Hi All, I have a question , I already have a clifford manifold . can i make a clifford manifold fit with a stock manifold , if so,what will i need to do? I have been reading on here,that there maybe issues. or should i sell it and go with a offy? Thanks for any help.
Ken
Author:  SlantSixDan [ Sat Aug 08, 2015 4:52 pm ]
Post subject:  Re: Stock Exhaust manifold to Clifford intake manifold fitti
Quote:
can i make a clifford manifold fit with a stock manifold
No, the Clifford intakes don't have provisions to connect to the exhaust manifold. Some of them do have provisions for hookup to the heater hoses to provide hot-water heating of the intake, which is better than nothing.
Quote:
should i sell it and go with a offy?
Yes…or with something else, depending on what your overall goal is.
Author:  Wesola78 [ Sat Aug 08, 2015 5:32 pm ]
Post subject: 
I have an Offy intake manifold on my slant six, and I have Dutra Duals. The Offy intake works just fine with my modified rear manifold, and it would also work with a stock exhaust manifold.
I say get an Offy intake, unless you plan to run headers.
This is just my suggestion.
Dan is right by the way.
Author:  octagon5 [ Sat Aug 08, 2015 8:04 pm ]
Post subject: 
Thanks SlantsixDan and Wesola78 for that info. much appreciated. Iam trying to get a little more HP out of a 64 w200, I wanted to do a motorcraft 2barrel on the clifford, the HEI conversion, Distributor springs, and I was thinking of a howards mildest cam. I live in southern New Mexico,short mild winters,but can get cold overnite. Do you think i can weld a plate inside the exhaust manifold to block that hole and still get some heat transfer. I alread have a good motorcraft 2barrel with 1.12 venturi size,i belive off a 68 mustang 289.
Thanks again,and any other thoughts much appreciated .
Ken
Author:  SlantSixDan [ Sat Aug 08, 2015 10:16 pm ]
Post subject: 
Quote:
I am trying to get a little more HP out of a 64 w200, I wanted to do a motorcraft 2barrel
Good choice. I have (new, for sale) an ideal carb adaptor/spacer/insulator to mount a Motorcraft 2100/2150 on a 4bbl intake; shoot me a PM if you'd like it. The right idea is to have the intake warm and the carburetor cool, and this (in conjunction with an intake that has provisions for exhaust hookup, such as an Offy or a Weiand) does that.
Quote:
I live in southern New Mexico,short mild winters,but can get cold overnite.
It is a common misunderstanding that intake manifold heat is only for wintertime/isn't needed in summer.
Quote:
Do you think i can weld a plate inside the exhaust manifold to block that hole and still get some heat transfer.
Not enough to make any difference.
Quote:
I alread have a good motorcraft 2barrel with 1.12 venturi size,i belive off a 68 mustang 289.
That's a little big; 1.08" is the preferred optimum, but 1.12 isn't all that much bigger.
Author:  octagon5 [ Sun Aug 09, 2015 6:06 am ]
Post subject: 
Thanks again SlantsixDan for taking the time to send more info. Sending a PM on that adapter.
Ken
Author:  kesteb [ Sun Aug 09, 2015 8:17 am ]
Post subject: 
Which Clifford manifold did you buy? The 4300WH has provisions for water heating built into the manifold. And water heating is more then adequate.

The offy manifold isn't any better than a cast iron SuperSix with the 2100. Both can use the exhaust stock manifold. The SuperSix would be cheaper to buy, but requires an different adapter for the 2100.


.
Author:  Wesola78 [ Sun Aug 09, 2015 8:42 am ]
Post subject: 
Dan is correct about the intake manifold heat not just being for cold weather. My modified rear manifold has a plate welded in like you described, and the Offy intake sits right on top of it. I live in south Texas, its brutally hot right now. My. Slant six starts right up and runs fine. During cold weather, drivability leaves much to be desired.
I'm probably giving up a little fuel efficiency without the correct intake manifold heat, even during August. :shock:
Author:  wjajr [ Sun Aug 09, 2015 12:49 pm ]
Post subject: 
Anytime a liquid is atomized such as sprayed from a pressure can, or squirting from a ventury in a carburetor it becomes cold

Once that cols air fuel mixture hits cold internal sides of intake manifold it condenses forming puddleing resulting in a lean condition, and sometime under the right humidity and ambient temperature conditions icing. Or in other words real poor drivability, and crappy idle.

This is the reason factory provided a heat source, or hot spot directly under the carburetor to counter act the leaning condition, and also why an automatic choke slowly opens as intake warms to a temperature that will support fuel staying in air until it enters the combustion chamber.

The problem with headers made for slants is no nice way to conduct waste heat to the intake manifold, this is why some after market intake manifolds have a provision to plumb hot coolant from heater circuit to their underside.

I have Clifford headers and 4v intake which I fabricated a hydronicly heated pocket under the carb area supplied by the heater coolant circuit. This modification was made after discovering one cool humid day what carburetor ice was all about; crappy drivability, nonexistent idle, and single digit fuel economy numbers. The temperature was around 40*F.
Author:  SlantSixDan [ Sun Aug 09, 2015 12:57 pm ]
Post subject: 
Quote:
Anytime a liquid is atomized such as sprayed from a pressure can, or squirting from a ventury in a carburetor it becomes cold
And we can all be thankful for that—it makes things like air conditioning and refrigeration possible.
Quote:
Once that cols air fuel mixture hits cold internal sides of intake manifold it condenses forming puddleing resulting in a lean condition
Yup...punctuated by a rich condition as slugs of condensed fuel coalesce and are slurped into the cylinders.
Quote:
Or in other words real poor drivability, and crappy idle.
Yup.
Author:  octagon5 [ Sun Aug 09, 2015 3:53 pm ]
Post subject: 
Quote:
Which Clifford manifold did you buy? The 4300WH has provisions for water heating built into the manifold. And water heating is more then adequate.

The offy manifold isn't any better than a cast iron SuperSix with the 2100. Both can use the exhaust stock manifold. The SuperSix would be cheaper to buy, but requires an different adapter for the 2100.


.
Hi kesteb, the manifold i bought dosent have the water heating. I didnt know that a adapter was available to go from a supersix to a motorcraft 2300.thanks for that info. id like to have the 2 butterflys in line with long lenght of the block(front to back). Thanks for the info.
Author:  octagon5 [ Sun Aug 09, 2015 4:01 pm ]
Post subject: 
Thanks everyone,its been a great lesson on the subject. I do want the manifold heat,it will be my work daily driver,it was till the exhaust manifold cracked,so i figured Id do some up grades while its down. To bad i didnt ask before i bought the clifford. Oh well ill just sell it and look for something else.Thanks for all the help.
Author:  octagon5 [ Sun Aug 09, 2015 4:04 pm ]
Post subject: 
Quote:
Dan is correct about the intake manifold heat not just being for cold weather. My modified rear manifold has a plate welded in like you described, and the Offy intake sits right on top of it. I live in south Texas, its brutally hot right now. My. Slant six starts right up and runs fine. During cold weather, drivability leaves much to be desired.
I'm probably giving up a little fuel efficiency without the correct intake manifold heat, even during August. :shock:
Thanks for that info. about the heat transfer not being quite good enough in the cold Wesola78.
Author:  wjajr [ Mon Aug 10, 2015 6:48 am ]
Post subject: 
A golden oldie form the wjajr archives:


Look here for an unheated Clifford intake shade-tree workaround. Update I now run 195 degree thermostat, and homemade water pocket was crafted from 1/2" aluminum stock, pancaked together using hand cut gaskets & sealer, and two threaded/ barbed 45* brass fittings off the hardware shelf. Rattle can engine paint spray job to make it look all perdie.
Author:  Charrlie_S [ Mon Aug 10, 2015 11:26 am ]
Post subject: 
But it still won't work with a stock exhaust manifold.
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