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Unread 09-18-2011, 09:34 AM   #16
John Strenk
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Yeah I got some..
Quote:
That was 'old school' manifold heater called a heat riser.

Open Position, exhaust goes straight out exhaust pipe.


Closed position, exhaust is diverted to heat floor of intake then out the exhaust pipe


There was a spring that would control the position of the flapper. Usually rusted away as in these photos.

When cold it would divert exhaust gases onto the floor of the intake manifold to keep it warm so gas would not condense out onto the surface of the cold manifold and pool on the floor.


These manifolds are usually bolted together and made of cast iron. They didn't realy flow very well.

Even my old '63 Chebbie had one of these. This knowledge has been around a long time.

Those jeeps with water heated manifolds used an electric manifold heater.


These would turn on when you had enough oil pressure and turned off when the intake was warm enough to keep the mixture from condensing out.
These manifolds are usually made of aluminimum.


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Unread 09-18-2011, 09:49 AM   #17
bamasteeler
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Thanks John
So when engine is reved valve should close off diverting all exhaust out exhaust manifold correct??
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Unread 09-18-2011, 09:57 AM   #18
John Strenk
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Quote:
Originally Posted by bamasteeler View Post
Thanks John
So when engine is reved valve should close off diverting all exhaust out exhaust manifold correct??

Well "closed position" is kinda hard to pick but it should look like this when reving:


The exhaust pressure is overcoming the pressure of the spring that would normally be diverting the exhaust to the intake manifold floor. To reduce any backpressure it forces the valve to allow the exhaust to flow directly to the exhaust pipes.
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Unread 09-18-2011, 10:22 AM   #19
hp_lovecraft
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Interesting- So when the valve is "open" is looks closed, but when its "closed" it looks open (because its really diverting the hot air UP and AROUND).

I've had it backwards the last 2 years! Granted... no ill effects.
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Unread 09-18-2011, 06:23 PM   #20
John Strenk
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Quote:
Originally Posted by hp_lovecraft View Post
Interesting- So when the valve is "open" is looks closed, but when its "closed" it looks open (because its really diverting the hot air UP and AROUND).

I've had it backwards the last 2 years! Granted... no ill effects.
Exactly...
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Unread 09-18-2011, 08:17 PM   #21
NoJeeper1
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How do I find the gasket that sits on top of the valve? I have a '79 that I borrowed and the spring broke. No parts houses have been able to identify the valve much less the gasket.
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Unread 09-19-2011, 03:12 AM   #22
John Strenk
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I just bought a intake/exhaust gasket set from Autozone and it was included in the kit.

If they never seen a heat riser before, need to find a part house with an older crowd selling parts.
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Unread 09-19-2011, 04:40 AM   #23
CALOcruiser
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Quote:
Originally Posted by NoJeeper1
How do I find the gasket that sits on top of the valve? I have a '79 that I borrowed and the spring broke. No parts houses have been able to identify the valve much less the gasket.
Mine came with a felpro set for the intake/exhaust. Whole set is $16 or so. All I needed was the gaskets for the head, since I have headers. I could mail you the gasket that goes between the intake and exhaust, which is just above the damper (I.e "valve").

I have the gasket set for a '78, but I don't think they changed.

PM me if you want it, but if you can get to that one, you should need the other ones too.
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Unread 09-19-2011, 08:17 AM   #24
NoJeeper1
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Thanks. Called local pepboys and spoke with parts guy who has 40+ years in parts. He knew exactly what I needed. Will pick up set this weekend. Thanks
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Unread 09-19-2011, 08:32 AM   #25
NoJeeper1
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THanks

Thanks. Called local pepboys and spoke with parts guy who has 40+ years in parts. He knew exactly what I needed. Will pick up set this weekend. Thanks

Last edited by NoJeeper1; 09-20-2011 at 09:48 AM.. Reason: Double post
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