D90 Heater modification - Defender Source
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  #1  
Old March 30th, 2015, 01:00 PM
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Robert Dassler
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D90 Heater modification

I have a client who's D90 is in for repairs. One of the things that we're doing is enlarging the heater opening in the bulkhead. I've searched some and found references to it, but haven't found a lot of pictures or other info. If anyone has any info to share, i'd like to hear it. It's relatively easy to see how big the opening could be, but i'm concerned with the seal slipping into the opening. I'm thinking of cutting it in such a way as to allow me to fold the metal into a flange to support the seal. What have you all done?
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  #2  
Old March 30th, 2015, 01:18 PM
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Joshua
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http://www.defendersource.com/forum/...a-38561-4.html
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I am talking purely from an aesthetics standpoint.
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  #3  
Old March 30th, 2015, 01:22 PM
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Jim Cheney
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I'm still curious if this mod actually increases the effectiveness of the heater, after all, the size of the restrictions affects the velocity and air pressure. Increasing the opening should increase the air pressure into the dash plenum, but counterintuitive lay, it will simultaneously reduce the velocity of the air. So the air could be perceived to be slower or more anemic coming out of the ducts. Maybe I'm overthinking this.
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  #4  
Old March 30th, 2015, 01:33 PM
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John B.
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The dash vents are much more restrictive. Without opening those up, I can't believe there will be a measurable different.

The bulkhead hole is 4.5" X 3.25" = 14.6 square inches.
The vents are 1.75" x 2.25" = 7.9 square inches for both.
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Old March 30th, 2015, 03:11 PM
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Jim Cheney
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I've always been very interested by the shape and cut outs in the stock AC under dash unit. There are restrictor plates behind every vent, with small holes on the passenger side near the blower, and larger holes on the drivers side further away.

Also, the under dash holes are not the only heater holes because there are the two pipes that lead to the defroster vents.

I wonder if the dash plenum actually build up pressure or if it just acts like a big sloppy distribution pipe. The pumping losses aren't really relevant, but I'm still really curious as to how it all works out.

Jsbriggs, you sound like an engineer, maybe you could model it for us? :D
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  #6  
Old March 30th, 2015, 03:46 PM
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shayne young
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There is also a mod to put a bigger fan Into the housing, this fan blows more cfm so would capitolise on the larger hole.. I think there was a thread on this board but it is a fairly common mod in England.. And it's an ac delco part from memory
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  #7  
Old March 30th, 2015, 07:53 PM
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Mike
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You can get a GM fan to replace the Rover fan to increase the flow. It is almost a direct replacement. #35333 Factory Air
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  #8  
Old March 30th, 2015, 07:58 PM
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Jason Lavender
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As you probably noticed, the link was to my pics. For those skeptical, I can tell you first hand that between the blower upgrade and the enlarged cutout my heater will knock your socks off (well, in Rover terms that is...but going from "asthmatic kitten breath" to "normal air flow" seems like a monumental upgrade).
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  #9  
Old March 30th, 2015, 08:53 PM
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Nice! Sounds like the fan is worth it!
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