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Re: Exhaust manifold
ndkid275 #1376838 Sat Sep 12 2020 09:43 PM
Joined: Feb 2004
Posts: 21,062
H
Boltergeist
I've got a few of each stashed away- - - - -if I can locate them, I'll be glad to check it out. My "inventory control" system sort of resembles a pile of scrap iron, however!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Exhaust manifold
ndkid275 #1376839 Sat Sep 12 2020 09:49 PM
Joined: Jan 2013
Posts: 1,811
Shop Shark
I appreciate it! I’ve got nothing but time since I haven’t even started the rebuild yet.

Thanks!

Chris

Re: Exhaust manifold
ndkid275 #1376844 Sat Sep 12 2020 10:26 PM
Joined: Jan 2020
Posts: 499
D
Shop Shark
Jerry, if the I.D. is smaller wouldn't it slightly restrict the flow. Ed


Currently making 1954 3100 better than new
Re: Exhaust manifold
ndkid275 #1376862 Sun Sep 13 2020 01:27 AM
Joined: Jan 2013
Posts: 1,811
Shop Shark
Doc,

I am asking about the exhaust manifold, not the intake manifold. Due to issues with the exhaust manifold, I am considering unbolting both my 216 and 261 and mating the 216 exhaust manifold with the 261 intake manifold.

Chris

Re: Exhaust manifold
Doc.Hall #1376864 Sun Sep 13 2020 01:40 AM
Joined: Feb 2004
Posts: 21,062
H
Boltergeist
Originally Posted by Doc.Hall
Jerry, if the I.D. is smaller wouldn't it slightly restrict the flow. Ed

That can actually help low end and midrange torque by increasing the velocity of the intake fuel and air gas column as it approaches the valve. If an engineer was deliberately trying to restrict high speed performance, he probably couldn't have done better than the Mickey Mouse port shape of a stovebolt cylinder head.

I don't think there's any real difference in 216 and 235 EXHAUST manifolds except the angle of the outlet.

Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Exhaust manifold
ndkid275 #1376865 Sun Sep 13 2020 01:41 AM
Joined: Aug 2018
Posts: 395
2
Shop Shark
I tried that with a 216 235 manifolds
The 4 bolts that hold the two together won’t line up
Got to use them as a set and they will interchange between the two engines
I’m running my 216 manifolds on my 235
I would suspect the 261 is like the 235 or even a third way different from the others
Let us know what you find out
-s

Re: Exhaust manifold
ndkid275 #1376866 Sun Sep 13 2020 01:50 AM
Joined: Feb 2004
Posts: 21,062
H
Boltergeist
OK- - - -finally somebody with some hands-on experience! Thanks! Is there enough of a difference in bolt spacing that one or the other of the parts couldn't be reamed to make the holes align? How about the mating flanges between the manifolds? Would a gasket seal?
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Exhaust manifold
ndkid275 #1376867 Sun Sep 13 2020 02:44 AM
Joined: Jan 2013
Posts: 1,811
Shop Shark
If it’s just an angle difference for the exhaust, that helps me out. I hope I don’t have to go buy another intake/exhaust manifold! I will go back and measure the bolt pattern again. They seemed awfully close.

Chris

Re: Exhaust manifold
ndkid275 #1376870 Sun Sep 13 2020 03:21 AM
Joined: Jan 2001
Posts: 5,024
P
Master Gabster
216’s dumped straight down up until 1948, then they angled back at the same angle as 235’s.
All this is moot as I stated in an earlier post, as the bolt pattern where the two bolt together is different, to be accurate the spacing of the two studs (not the carb studs) are different.


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Re: Exhaust manifold
ndkid275 #1376871 Sun Sep 13 2020 03:26 AM
Joined: Jan 2013
Posts: 1,811
Shop Shark
Thanks Dave!

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